This system acquires, filters, averages, corrects, displays and distributes meteorological sensor data from a wide variety of sensor types and serial data streams.

Meteorological sensors such as ones made by RM Young, Vaisala, Alden, Coastal

Environmental Systems, Seabird, FSI, Omega and most sensors that have an RS485, RS422, RS232 digital interface or any analog sensor that can output a voltage, frequency or 4-20ma current can be accommodated.

Atmospheric meteorological sensors are generally located on either the forward part of the ship on the MET mast and/or above the ship's upper bridge deck. Sensors that measure seawater properties are generally located near the uncontaminated seawater intake area or in one of the ship's laboratories that has a connection to the uncontaminated seawater line.

A typical system measures air temperature, barometric pressure, wind speed/direction, relative humidity, short wave radiation, long wave radiation, seawater temperature and seawater conductivity. Sensor information is combined with time, Gyro and GPS position information and displayed/stored on the acquisition device.

The main acquisition device is a Windows based computer that is has at least two serial ports. Data can be acquired simultaneously on all enabled ports. One or more ports can be configured to support RS485 communications through RS232 to RS485 converters. Sensors that have analog outputs are first connected to signal conditioning modules that are physically located near the sensor. These modules then convert the analog signal to RS485 that is then routed to the lab. Collected data is stored on data files at user-selected intervals. This interval is typically once every 30 seconds. Acquired data that has been collected from the sensors (uncalibrated) is stored in an uncorrected data file. Data that has been corrected by applying the most recent precruise calibration data is stored in a corrected data file.

At least once a year all Sensors are removed from the vessel, refurbished and calibrated at an appropriate shore based maintenance/calibration facility. Calibration data for each sensor is kept onboard each vessel and entered into the shipboard acquisition/setup file that is used by the acquisition program to correct sensor data for display and storage.

1.1.0 Meteorological Acquisition Program

The acquisition program was written in the Labview programming language. It acquires, displays and stores meteorological data in real-time.

Main features:

1. Acquire data from any number of sensors or instrumentation

2. Data Displays present data in numerical form (either calibrated or uncalibrated)

3. Real-time 18-strip chart displays that chart user selected data vs. time.

4. History scroll bar on each strip chart that allows viewing of previously displayed data

5. Ability to output hardcopy of the displayed data.

6. Write data to files at user selected intervals (calibrated and uncalibrated)

7. Variable user defined data output formats that can be output to serial port or file.

8. Ability to playback and view any standard data file.

1.2.0 Minimum Systems Requirements

Microsoft Windows 2000

Pentium II 800MHZ or higher processor

XGA Video card and monitor capable of 1024x768 16 bit color 64MB RAM

2-34 RS232 Comm ports

Installed on hard drive (20GB or higher)

National Instruments Labview Runtime engine v6.1

National Instruments VISA Runtime engine v2.6

STS MetAcq.exe Acquisition program

1.3.0 Contact Information

For help or assistance with any part of the meteorological system contact:

Shipboard Technical Support 0214

Shipboard Electronics Group

tel (858)534-1907

fax (858)534-7383

email: all-at-seg@odf.ucsd.edu

Meteorological Acquisition Program written by:

Carl Mattson

Shipboard Technical Support 0214

cmattson@ucsd.edu

tel (858)534-1907

2. Meteorological Sensor types

A sensor type is a software module that produces one complete data set for a particular function. For example, WND is a module of the wind sensor type; it consists of two sensors that output one data set that contains two raw values – 1.Wind Speed, 2.Wind Direction. From these two raw values, calculations may be applied to output corrected values as well as calculated values. For example the wind sensor type can be set to output True Wind Speed and True Wind Direction as well as the relative values. Each sensor type has an ID that is similar to the address values of the older Alden IMET system modules. However, in this case the sensor ID’s are no longer address values with the exception of an installation that still uses the Alden Imet modules.

The first three letters of the sensor modname must begin with one of the following Type designators. The next two characters should be an ID to determine which module is selected. Each sensor used on SIO ships is assigned it's own ID. In this system there are 30 predefined module types that cover the most requested sensor types.

Item	TYPE	Description	Associated Parameters (Appendix A)
1	TMP	Air Temperature	AT
2	HRH	Relative Humidity, Temperature	RH, RT, DP
3	BPR	Barometric Pressure, [Compensation Temp]	BP, BC
4	PRC	Precipitation	PR, PT
5	WND	Wind Speed, Wind Direction	WS, WD, WK, TK, TW, TI
6	SWR	Short Wave Radiation	SW
7	LWR	Long Wave Radiation Dome Temperature, Body Temperature, Thermopile voltage	LW, LD, LB, LT
8	FLW	Flowmeter	FM, FI
9	SST	Surface Seawater Temperature	ST
10	SSC	Surface Seawater Conductivity	SC
11	VLT	A/D Volts	VT
12	FLU	Fluorometer	FL, TB
13	XMS	Transmissometer	TR, BA
14	OXY	Oxygen	OC, OT, OS, OX, OG
15	TSG	Thermosalinograph	TT, TC, SA, SD, SV
16	USP	Unspecified (user defined)	XX
17	PAR	Surface PAR	PA
18	AWT	Auxiliary Water Temperature	WT
19	AXT	Auxiliary air Temperature	AX
20	---
21	PRS	Pressure	PS
22	PDR	Water Depth	BT
23	NME	NMEA messages	LA, LO, CR, SP, GT
24	GYR	Gyro	GY
25	ASH	Ashtech Heading, Pitch, Roll	SH, SM, SR
26	TSV	Time Server	TS
27	WCH	Winch Wire Out, Wire Speed, Tension	ZO, ZS, ZT
28	ALK	Alkalinity (pH)	PH
29	VRU	Vertical Reference Unit (Pitch, Roll, Heave)	VP, VR, VH, VY, VX
30	SOW	Ship’s Speed Log (Speed over water)	SL

Sensor Type Default Settings

Sensor Type	Num Raw Values	Num Cor Values	Precision	Parameter Tag	Range MIN	Range MAX
TMP	1	1	2	AT	4.00E+1	5.00E+1
HRH	2	3	2 2 2	RH RT DP	0.00E+0 -4.00E+1 -4.00E+1	1.00E2 5.00E1 5.00E1
BPR	1	1	2	BP	8.00E+2	1.10E+3
PRC	1	1	1	PR	0.00E+0	5.00E+1
WND	2	4	1 1 1 1	WS WD TW TI	0.00E+0 0.00E+0 0.00E+0 0.00E+0	2.00E+2 3.60E+2 2.00E+2 3.60E+2
SWR	1	1	1	SW	-5.00E+3	5.00E+3
LWR	3	4	2 2 1 1	LD LB LT LW	2.00E+2 2.00E+ 2 -5.00E+3 -2.00E+3	5.00E+2 5.00E+2 5.00E+3 2.00E+3
FLW	1	1	1	FI	0.00E+0	1.00E+3
SST	1	1	3	ST	-5.00E+0	5.00E+1
SSC	1	1	3	SC	-5.00E+0	9.00E+1
VLT	1	1	3	VT	-1.00E+2	1.00E+2
FLU	1	1	3	FL	-5.00E+2	1.00E+5
XMS	1	2	3 3	TR BA	0.00E+0 -1.00E+2	1.00E+2 1.00E+2
OXY	2	4	3 3 3 4	OC OT OX OS	-5.00E+0 -5.00E+0 -1.00E+1 -1.00E+1	1.00E+4 5.00E+1 1.00E+4 1.00E+4
TSG	2	5	3 3 3 3 3	TT TC SA SD SV	-5.00E+0 -5.00E+0 0.00E+0 0.00E+0 1.40E+3	5.00E+1 1.00E+2 8.00E+1 5.00E+1 1.60E+3
USP	1	1	3	XX	-1.00E+6	1.00E+6
PAR	1	1	2	PA	-1.00E+5	1.00E+5
AWT	1	1	2	WT	-5.00E+0	5.00E+1
AXT	1	1	2	AX	-4.00E+1	5.00E+1
PRS	1	1	2	PS	-5.00E+1	1.00E+5
PDR	1	1	1	BT	-5.00E+0	1.50E+4
NME	5	5	6 6 1 1 1	LA LO GT CR SP	-9.00E+1 -1.80E+2 0.00E+0 0.00E+0 0.00E+0	9.00E+1 1.80E+2 8.64E+4 3.60E+2 5.00E+1
GYR	1	1	1	GY	0.00E+0	3.60E+2
ASH	3	3	1 1 1	SH SM SR	0.00E+0 -3.00E+1 -6.00E+1	3.60E+2 3.00E+1 6.00E+1
TSV	1	1	0	TS	0.00E+0	8.64E+4
WCH	3	3	1 1 1	ZO ZS ZT	-2.00E+4 -2.00E+4 -5.00E+4	2.00E+4 2.00E+4 5.00E+4
ALK	1	1	2	PH	-1.50E+1	1.50E+1
VRU	3	5	1 1 2 1 1	VP VR VH VY VX	-6.00E+1 -6.00E+1 -1.50E+1 -6.00E+1 -6.00E+1	6.00E+1 6.00E+1 1.50E+1 6.00E+1 6.00E+1
SOW	1	1	1	SL	0.00E+0	8.00E+1

If not so specified the above values are what the program uses for default values.

Default settings for any sensor type can be changed and/or can be overridden in the ACQ file Using the Keys: TAGS-C, TAGS-R, PRC-C, PRC-R, RANGE (see Section 9).

3. Installation

Certain applications must be installed on the computer before the system can operate.

1. National Instruments Labview Runtime engine v6.1

2. National Instruments VISA Runtime engine v2.6

3. STS MetAcq.exe Acquisition program and supporting files

Refer to documentation supplied by National Instruments for instructions on installing the NI Labview Runtime engine and NI VISA Runtime engine. The Labview Runtime engine should be installed prior to the VISA Runtime engine.

The Windows path name is set to include C:\Wbin in the main path.

The following files are installed in C:\Wbin:

MetAcq.exe MetAcq.ini Metacq.dsp settime.dll

Web Server support files are installed in C:\Wbin\www.

Met system manuals and documentation are located in C:\MET.

3.1.0 Program setup and corrections file

This file contains serial port, program parameters and sensor setup and calibration data that the program uses for the following operations:

1. Activation and setup of computer serial ports

2. Activation and selection of sensor input modules

3. Setup of sensor address and communication parameters

4. Setup of desired correction/calibration algorithm

5. Sensor calibration coefficients

6. Data averaging parameters

7. Specify user defined output modules for serial port/data file writes

Program setup and corrections file <name>.ACQ is located in a user-designated directory (default directory is C:\MET). All MET data is written to the same directory that the selected ACQ file is located.

See Section 7 and Section 9 for details on the setup and corrections file.

4. Operation

After the Met acquisition computer is properly configured and setup then the following procedures can be used to perform program operations.

4.1.0 Startup Procedure (quick)

Power ON the MET computer
Ensure power is ON to all Met sensors
Observe that the Windows operating system is properly booting up.
The acquisition program will start. The program control panel will appear on the monitor.
At this point you can do one of two things.

Do nothing; the program will start in about 30 seconds.
Click on the green control button labeled <Start>

Note that the acquisition program is set to start automatically upon boot up.

4.2.0 Startup Procedure (detailed)

1. Ensure power is ON to all Met sensors

2. Ensure acquisition computer is powered up and booted up to the Windows operating system

3. On the Windows desktop display, using mouse, select the icon labeled MetAcq.exe

4. After the acquisition program is loaded, the user will see a control panel. At this point the program is in Standby. During Standby mode you may select the desired met configuration file, mode of operation, type of display, enable/disable of automatic time sync and enable/disable data averaging. The lower control panel also contains several status indicators that can be observed during program operation.

5. After making the desired selections, click on the green control button labeled <Start>

4.2.1 Modes of Operation

1. <Acquire> This is the normal mode for data acquisition

2. <Playback> Playback any archived data file

3. <Cascade> Display data sent by RS232 from the primary acquisition PC

4. <Emulate> Sensor Emulation mode

4.2.2 Configuration File Select

The configuration file used by the acquisition program may be selected by using the indicated control. Just click on the little yellow folder symbol on the right side of the control. The configuration files are indicated be the file extension ACQ (For example SPROUL.ACQ).

4.2.3 Time Synchronization

If a Network timeserver is connected to the network then the system time of the MET acquisition computer is automatically synchronized to the timeserver time using NTP protocol. When no network time server is connected then the MET acquisition computer the system computer time will be synchronized to the time obtained from the GPS.

When GPS Sync is enabled, and it is desired to synchronize the time manually, then click on the Time Sync control located just below the GPS Sync control.

4.2.4 Display Modes

1. <Strip Chart4> Selects 4 strip charts with 30 numeric parameter display indicators.

2. <Strip Chart6> Selects 6 strip charts with 30 numeric parameter display indicators.

3. <Strip Chart8> Selects 8 strip charts (Numeric displays are not shown in this mode).

4. <Tabulated> Selects Tabulated display with 24 parameter display indicators.

5. <Tabulated-GPS> Selects Tabulated display with GPS indicators and 24 displays.

6. <Fixed> Selects Fixed display showing the basic suite of MET data.

The Display mode has no effect on what data is stored in the MET data files. The information in the data files is determined by which sensors are activated in the configuration file.

4.2.5 Enable Data Averaging

When ON data averaging is enabled. The averaging setup parameters must be specified in the module section of the setup file (see section 9.3.0). Averaging can be enabled or disabled individually for any sensor. Averaging time can also be specified for any sensor. There are two types of averaging available. 1-Normal, 2-Vector. Vector averaging is used only on sensors that output in angular degrees such as wind direction.

4.2.6 Status Indicators

Runtime indicator – displays the length of time the program has been executing without interruption.

Scans Per Second (SPS) indicator – displays the number of times per second that the program scans through all of the sensors. This gives a general idea of how well the program is working. With several sensors the SPS will be lower; with few sensors the SPS will be higher. Generally the SPS should always be above 0.5 to indicate proper program execution.

Data Files indicator – displays the name and path of the data file that is currently being written. There are at least two files that the program updates every write interval. One file for the corrected data and the second for the uncorrected data. A new set of data files are started at the beginning of each (GMT) day beginning at 0000Z. Section 10 describes the data files.

SIZE indicator – displays the size in bytes of the data files. After each data write interval this value will increase.

CHK MOD indicator – Displays a list of sensors that fail to respond or output data. If a failure has been indicated there are 3 possibilities.

The sensor(s) have failed
The sensor power is OFF
The sensor(s) have been disconnected.

4.3.0 Program Operation

After the program has been started as described in sections 4.1.0 or 4.2.0, the main display Window appears. This Window will be one of eight different configurations depending on the Display Modes setting. The Display Mode setting may be changed to another type of display at any time.

In each display mode every window has it’s own menu to select desired values to display and plot. To change the displays – click the control button to access the pop up menu on the upper left – labeled <Displays>. In the popup display you can change the parameters, sensor module, and number of decimal places that are displayed. When finished making selections click on the <X> on the upper right corner of the display.

Display Selection Menu

Additionally you can change the parameter to be charted on any of the strip charts by clicking on the <Plot Scales> control. In this popup display you can select the parameters, sensor module, number of decimal places, auto scale enable, minimum scale value and maximum scale value. The sensor module selection on either the display selection or plot section allows you to select between redundant sensors. For example, if there were two air temperature modules and you wished to chart the second one, select it’s module number. Module numbers are numbered starting from zero. Zero being the first module. The minimum and maximum scale values can only be accepted if the autoscale is turned OFF. When autoscale is ON the program automatically adjusts the minimum and maximum scale values. The AUTOSCALE is initially enabled but if it is desired to manually set the scales of the Plot. Click on autoscale to disable it. Then either enter the Min/Max values in the Plot Scales popup or simply click on the upper and lower scale values on the chart, then enter the desired values.

Plot Selection Menu of Strip Chart 8-plot

Screenshot of Strip Chart 4-plot after activating plot selection menu

The strip charts have a history bar. If it is desired to view data that has already scrolled off the screen move the history bar to the desired setting.

The Clear Plot control clears the plot and plot history.

The Time Scale may be changed to any value in hours. Initially it is set to 24 hours. To change, move the mouse on the control and click to enter the value. Each time the Time Scale is changed you must also click on the clear plot control to view the new chart time scale.

The PRINT control allows the plot that is currently displayed to be sent to a printer. Before using this control the printer must be properly connected, have a windows driver installed, must have paper and be turned ON. The printer control may be disabled in the program setup file using the keyword PRINT_EN = FALSE. (Section 9)

Screenshot of Strip Chart 4-Plot

Screenshot of Tabulated Display

4.4.0 Program Termination procedure

To terminate the acquisition program move the mouse to the red control labeled <Stop> located in the lower left side of the screen. Click the mouse on this control. A Popup window will appear to verify that you wish to cease acquisition. If you confirm that you want to stop the acquisition then click on the red <STOP> control located in the popup window. The acquisition program will stop acquisition and data file logging and then enter standby mode.

The program can then be reactivated at any time by hitting the green <Start> control.

If it is desired to quit the acquisition program completely, click on the control labeled <EXIT>.

The <EXIT> control can only be reached during standby mode.

5. Connecting to the WEB Server

The meteorological displays can be viewed on any computer that is connected to the network. A web browser such as Microsoft Internet explorer or Netscape that is running on any computer such as Solaris, Linux, Unix or Apple operating system can access the MET Display.

The Web server function is independent of any computer or system on the network. It will work in either a network that has a Unix or Windows name server station or in a network that consists of only the MET acquisition computer and the user’s local computer.

5.1.0 Setting up the Web Browser

On the MET acquisition PC the file METACQ.INI is usually located in C:\Wbin directory.

Ensure that it contains the following statement:

[MetAcq]

WebServer.Enabled=True

Any panel can be viewed on any browser regardless of the Display Mode setting of the acquisition computer. Any Strip chart can be viewed on the browser at the same time that Tabulated displays or another strip chart type is shown on the acquisition PC. The following panels are available.

Display Mode PANEL

Strip Chart 4 Metdisp.vi

Strip Chart 6 Metdisp6.vi

Strip Chart 8 Metdisp8.vi

Tabulated MetNum.vi

Tabulated-GPS MetGps.vi

Fixed MetFixed.vi

The user’s computer needs to be connected to the same network that the MET acquisition PC is connected. It must be configure to the network in the standard method used on a particular vessel or laboratory. The IP number is assigned or DHCP is used.

On the user’s computer, start the web browser. If using Netscape or Internet Explorer press the <F11> key (on the user’s computer). This will put the browser in full screen mode for best viewing. (to switch back just press <F11> again).

There are three methods that can be used to view the met display on a web browser.

In the location on the browser that you ordinarily specify the web address enter the network name or IP number of the MET PC. The MET home web page will now be visible. From this web page select the link to the desired display or follow the navigation arrow in lower right of the screen. This arrow can be followed on each panel is succession.
Using method#2 you can go directly to the desired screen without using the above menu. Enter the network name or IP number of the MET PC followed by one of the following:

/metdisp4.htm /metdisp6.htm /metdisp8/htm /metnum.htm /metgps.htm metfixed.htm

E.g. http://metpc/metdisp.htm

The third method is somewhat more complicated:

Assuming the MET computer's ID is called metpc and you choose to view the Strip Chart 4 display

http://metpc/.snap?metdisp.vi

If DNS is not enabled or there is no host file then use the IP number of the MET acquisition computer e.g.

http://100.100.100.001/.snap?metdisp.vi

For Continuous updates use the following:

http://metpc/.monitor?metdisp.vi&refresh=15&lifespan=0

Refresh specifies the number of seconds between updates, and lifespan is the number of seconds that the WEB page remains active. Lifespan=0 tells the browser not to time out.

Using Method #1 the following screen will appear on the local computer. Select the link to the desired display or click on the arrow on the right side of the page. On the lower right of each page is an arrow to allow going to the next screen in sequence. On the local computer start the browser then enter the address. Press the function key <F11> to get full view.

MET Web Server

Stripchart Display 4-Plot

Stripchart Display 6-Plot

Stripchart Display 8-Plot

Tabulated Display

Tabulated-GPS Display

Fixed Display

MET Program Manual

MetAcq Program Documentation

Met Sensor Specs

Meteorological Sensor Documentation

MET Data Directory

5.1.1 Downloading images

To download any display image such as a strip chart, place cursor on display and right click on the mouse. Select “Save picture as…” then enter filename info to save the file.

5.1.2 Network tips

When connecting to the MET acquisition computer in a network that has no DNS or DHCP server, it may be necessary to change the IP number of the local computer. The first nine numbers should be made the same as the first nine numbers of the MET computer. However, the last three numbers must be a unique number.

6. Copying Data Files

There are several ways to copy data files.

It is not necessary to interrupt the acquisition program.

Files may be copied at any time.

1. Open a Command Prompt Window, then use the COPY command to copy files to the backup

device. For example;

COPY *.MET E:

This will copy only files of type .MET to drive E:

2. Open Windows Explorer, select the data directory, select the desired files to copy, and then select “COPY to folder” then enter the destination directory.

3. Click on the COPY control button located on the acquisition program control panel. Click OK when ready to copy. This will copy all files in the MET data directory onto the computer's ZIP disk. Be sure to insert a formatted, blank zip disk with sufficient free space to hold the files prior to clicking on the control.

4. If the FTP server is enabled and the network is operational, data files may be directly downloaded from the MET PC directly to the local computer. Enter the following command.

ftp <network name of METPC>.ucsd.edu

ftp <ip number of MET PC>

5. Files may also be downloaded via the MET PC web server (see section 5).

7. Configuring Serial Ports

The first part of the acquisition setup file determines how serial ports are assigned as well as the characteristics of each port.

Up to 34 ports may be accommodated. In the section that follows, each line begins with a UNIT device number. This number is not the computer's COMM port number but is the Logical Device number that the labview program uses to identify a particular serial line. Any computer COMM port may be assigned to any program UNIT number. But it is not permissible to assign a computer COMM port more than once. If a UNIT device is disabled then the COMM port number is ignored. An example of the serial port assignments follows:

# Serial Port and Sensor Configuration/Calibrations file

UNIT1 0 COMM1 9600 NONE 8 1 Spare

UNIT2 0 COMM2 9600 NONE 8 1 Spare

UNIT3 1 COMM3 9600 NONE 8 1 RS485 - MET Mast Sensors

UNIT4 1 COMM4 9600 NONE 8 1 RS485 - Flo-thru sensors

UNIT5 1 COMM5 9600 NONE 8 1 RS485 - FSI CT sensors

UNIT6 1 COMM6 4800 NONE 8 1 RS232 Input - GPS Pcode

UNIT7 1 COMM7 9600 NONE 8 1 RS232 Input - Gyro

UNIT8 1 COMM8 9600 NONE 8 1 RS232 Input - Knudsen Depth

UNIT9 1 COMM9 9600 NONE 8 1 RS232 Input - Ashtech

UNIT10 1 COMM10 9600 NONE 8 1 RS232 Input - Time Server

UNIT11 7 COMM11 9600 NONE 8 1 RS232 Output - SB2000 Nav

UNIT12 10 COMM12 9600 NONE 8 1 RS232 Output - VTG, HDT to MRU

UNIT13 17 COMM13 9600 NONE 8 1 RS232 Output - TSG Data to Gyro box

UNIT14 4 COMM14 9600 NONE 8 1 RS232 Output - MET Data to Main Lab

UNIT15 0 COMM15 9600 NONE 8 1 RS232 Output - Surf PAR to SBE11

UNIT16 0 COMM16 9600 NONE 8 1 Spare

UNIT17 0 COMM17 9600 NONE 8 1 Spare

UNIT18 0 COMM18 9600 NONE 8 1 Spare

UNIT numbers that assign an active port to a particular sensor are placed in the Sensor

Type setup file in the first number following the <MSP = > keyword. (See Section 9.2.0)

MetAcq Serial Ports configuration

1. a. Unit Device Number

b. Unit Code

0 Disable unit (If zero the sensor will be emulated)

1 Enable unit

2-20 Device Output code (see section 8)

c. COMM port number

d. Baud rate

300 1200 2400 4800 9600 19200 38400 76800 115200

e. NONE No Parity

ODD Odd Parity

EVEN Even Parity

f. Data bits 7 or 8

g. Stop bits 1 or 2

Throughout the ACQ file, if the first character of a line starts with the '#' sign then it is treated as a comment line and ignored by the program. Blank lines are also ignored

8. Sending Serial Data

8.1.0 Functional Description

Serial data of various formats may be transmitted from the Acquisition computer to an external device or distribution network.

To assign output data to a serial port put the appropriate Output Code in the UNIT code location then set the desired baud rate, parity, data bits and stop bits. See section 9.3.0

The following pre-defined outputs are available. To specify user defined outputs see sections 8.13.0 and section 9.4.0

8.1.1 Serial Output Data Types

Data Type	Function Code	Output Interval	Comments
MET Data (Corrected)	Code 2	Any	(Format in Section 10)
MET Data (Uncorrected)	Code 3	Any	(Format in Section 10)
MET Data (Translator Format)	Code 4	Any	(Format in Section 10)
Seabeam 2100 Sound Velocity	Code 5	5 Secs
Seabeam 2100 Navigation	Code 6	1 Sec
Seabeam 2000 Navigation	Code 7	1 Sec	(Appendix C)
VTG, HDT Message	Code 10	1 Sec	(Appendix B)
EM120 Sound Velocity	Code 13	1 Sec	(Appendix C)
Surface Par Output	Code 14	1 Sec
Calcofi(2003 MET Data Stream	Code 17	5 Sec	*
GLL, VTG, DBT, HDT	Code 18	1 Sec	(Appendix B)
User Defined	Code 20	Any	(Section 9.4.0)

*Calcofi 2003 MET Stream

$WICCI,ddmmyy,hhmmss, AT, BP, TK, TI, TT, SA, FL, LA, LO, T*<Checksum><cr><lf>

Precision 2 2 1 1 3 3 3 5 5 1

9. MET Input/Output Configuration

9.1.0 Module Activation Section

After the serial port section, the module selection section follows. Specifying the Sensor ID will activate sensors. Each Sensor ID that is specified must have its associated setup/calibration section attached in the latter part of the setup file.

An example module selection follows:

The word STARTMOD must be placed at the beginning of the sensor list. Each module has a 5 character ID that conforms to the specification from section 2. Each module included in the sensor list must have an entry in the module setup and calibration section.

STARTMOD

PRC01 TMP01 HRH01 BPR01 WND01 SWR01 LWR01 AXT11 VLT05 TSG01 FLW01 WND09 OXY02 AWT02 FLW02 FLU02 PAR01 NME01 GYR01

ENDMOD

The word ENDMOD must be placed at the end of the sensor list. When removing sensors you need only remove the name from the above list. You do not need to delete the sensor section itself.

9.2.0 General Section

The General section includes miscellaneous information such as Title, Copy file destination, Enable hardcopy print button (PRINT_EN) and Enable/Disable generation of data files in the Translator format (MK_COR and MK_UNC). TIMEOUT is the maximum number of milliseconds the program will wait for a response from a sensor. FileWriteInterval is the interval in seconds between file writes to a data file. SerialWriteInterval is the interval in seconds between serial output strings when the output Code is set to 2, 3 or 4.

General Section Keynames

[GENERAL]		Defaults
TITLE	Shipname	TITLE = R/V Sproul
ZIPDIR	Drive Letter	ZIPDIR = E:
PRINT_EN	Enable/Disable Printer TRUE or FALSE	PRINT_EN=FALSE
MK_COR	Enable/Disable COR FileTRUE or FALSE	MK_COR = FALSE
MK_UNC	Enable/Disable UNC File TRUE or FALSE	MK_UNC = FALSE
MK_LOG	Enable/Disable LOG File TRUE or FALSE	MK_LOG = FALSE
CHART_RATE	Interval in Seconds that the Strip Chart Updates	CHART_RATE = 2.0
TIMEOUT	Timeout in milliseconds to wait for Sensor Response	TIMEOUT = 300
FileWriteInterval	Interval in Seconds between File Writes	FileWriteInterval=30.0
SerialWriteInterval	Interval in Seconds between Serial out messages	SerialWriteInterval=30.0

9.3.0 Input Module Setup and Calibration Section

Each Active module has a section that starts with the 5-character module ID enclosed in brackets. In these sections key names are used to assign sensor characteristics.

Input Module Section Key names

Keys		(Example)
SENSOR	Sensor Description	SENSOR = Air Temperature
MODEL	Model Number	MODEL = 41342LC
MFG	Manufacturer	MFG = RM Young
SERIAL	Serial Number	SERIAL = 3944
OWNER	Organization/owner of Sensor	OWNER = STS
CAL_DATE	Calibration Date	CAL_DATE = 03-Feb-03
CAL_LAB	Calibration Lab	CAL_LAB = ODF
LOCATION	Where Sensor is installed	LOCATION = FWD MET MAST
COMMENTS	Any Info	COMMENTS = Primary Air Sensor
CMD	Module address and/or command line sent to Sensor	CMD = #x\r (see backslash codes below)
MSP	Module Setup Parameters (see 9.3.1)	MSP = 3 1 0 0 10 0 1 1 0 0 0 0 0 0 0
MCP	Module Calibration Parameters (see 9.3.2)	MCP = 1 1 1 0 13 0 0 0 0 0 0 0
TAGS-C	Parameter Tags to include in corrected data file	TAGS-C = AT
TAGS-R	Parameter Tags to include in uncorrected data file	TAGS-R = AT
PRC-C	Precision (Num Decimals)corrected data	PRC-C = 2
PRC-R	Precision (Num Decimals)uncorrected data	PRC-R = 3
EMULATION	Emulation of Values before corrections	EMULATION = 70.0
AVGTYPE	Type of Average 0-None 1-Normal 2-Wind Vector	AVGTYPE = 1
SECSTOAVG	Number of seconds to average data	SECSTOAVG = 10.0
ADCALTYPE	A/D calibration type of each parameter	ADCALTYPE = 0
UCR_RANGE	Parameter Range limits – Uncorrected data
ADCAL	A/D corrections	ADCAL = 1.0, 0.0
COR	Parameter corrections	COR = 9.96E-01, –49.92 1.0
RANGE	Parameter Range limits – Corrected data	RANGE = -40.0, 50.0
ADDTOFILE	Include in Data Files	ADDTOFILE = TRUE
DELIMITERS	Input data Delimiters Delimiters can be any ascii character(s) That are used to separate input values. Defaults are \t \n \r \s ,	DELIMITERS = \t \n \r \s , (see backslash codes below)

Backslash ('\') Codes

Code	LabVIEW Interpretation
\00 - \FF	Hex value of an 8-bit character; must be uppercase
\b	Backspace (ASCII BS, equivalent to \08)
\f	Form feed (ASCII FF, equivalent to \0C)
\n	Linefeed (ASCII LF, equivalent to \0A)
\r	Carriage return (ASCII CR, equivalent to \0D)
\t	Tab (ASCII HT, equivalent to \09)
\s	Space (equivalent to \20)
\\	Backslash (ASCII \, equivalent to \5C)

Backslash codes can be used in the Keys: CMD and Delimiters.

The CMD key name specifies the command that is sent to the module. If a module has an address of SWR01 and a attention character of “#” and an additional command Of “C” then the CMD line would be CMD = #SWR01C

The attention character is the character that the module recognizes as the attention character.

It is usually a ‘#’ but it can sometimes be ‘$’ or ‘!’.

You can use backslash codes in the CMD command. Some modules require a terminating character on the end of the command string which is usually a carriage return. You can specify this with the ‘\r’ character. E.g. CMD = #x\r where x is the module address/command. If the module requires binary addresses and/or commands then use the backslash hex value. Only two hex characters can be specified per backslash. For more hex characters just keep adding backslashes and two hex characters.

E.g. CMD = #\F0\01\E4\0A This sends the 32 bit binary integer F001E40A to the module.

Some modules can get data from more than one addressable source. In this case the source must be specified for each input parameter.

Key names CMD, MSP, RANGE, UNC_RANGE, ADCAL and COR can be individually set for each source of data by appending a numeric identifier.

CMD = (first input parameter)

CMD2 = (second input parameter)

CMD3 = (third input parameter)

In these cases it is required that the key names CMD, MSP, and COR be individually specified.

Key names RANGE, UNC_RANGE, ADCAL are usually optional.

9.3.1 MSP Module Setup Parameters

1 Port Number	0-Disable port 1-Port number.
2 Input Device type	0-RS485 Sensor Module 1-RS485 DGH Module 3-RS232 Continuous Serial Data 4-Time Server 6-SBE21 TSG Unit 7-Simrad EM VRU 8-NMEA message 10-Hippy 120 VRU
3 Internal use	0-Normal
4 Internal use	0-Normal
5 Termination character	Decimal value of the terminating character of the data returned from sensor. 10-Normal, 3 if using ALDEN IMET Module.
6	Number of milliseconds to wait for an RS485 device to release bus. 0-Normal
7	Number of variables returned from sensor (8 Max)
8	Index for variable #1
9	Index for variable #2
10	Index for variable #3
11	Index for variable #4
12	Index for variable #5
13	Index for variable #6
14	Index for variable #7
15	Index for variable #8
1 Port Number	0-Disable port 1-Port number.
2 Input Device type	0-RS485 Sensor Module 1-RS485 DGH Module 3-RS232 Continuous Serial Data 4-Time Server 6-SBE21 TSG Unit 7-Simrad EM VRU 8-NMEA message** 10-Hippy 120 VRU
3 Internal use	0-Normal
4 Internal use	0-Normal
5 Termination character	Decimal value of the terminating character of the data returned from sensor. 10-Normal, 3 if using ALDEN IMET Module.
6	Number of milliseconds to wait for an RS485 device to release bus. 0-Normal
7	Number of variables returned from sensor (8 Max)
8	Index for variable #1
9	Index for variable #2

When determining index numbers only spaces, commas, tabs and carriage returns are considered as legal delimiters. Consider the following string that could be output by a module. If it is an

Air temperature module and the actual set of values are returned are:

1000, 25.0 60.0 10.0<cr><lf>

Count, Air Temperature, R1value, R2value

Then the correct index number is 2 as it selects the second item in the string as air temperature.

**NMEA messages that can be input to the MET program are:

GGA, VTG, GLL, RMC, HDT, ZDA, MWV, DBT and PASHR ATT (SHR)

Specify the selected NMEA message(s).

Example 1:

CMD = GGA VTG ZDA

Example 2:

CMD=RMC

NMEA MET Parameters extracted

GGA	LA LO GT
VTG	CR SP
GLL	LA LO GT
RMC	LA LO CR SP GT ZD
HDT	GY
ZDA	ZD
MWV	WS WD
DBT	BT
SHR	SH

9.3.2 MCP Module Calibration Parameters

1	0-Calibrations not applied in Acquisition program 1-Calibrations applied in Acquisition program
2	0-Calibrations not applied in MET sensor Module 1-Calibrations applied in MET sensor Module
3	3-Number of parameters to be computed from the returned variables
4	Calibration method for A/D correction
5	Calibration method for parameter #1
6	Calibration method for parameter #2
7	Calibration method for parameter #3
8	Calibration method for parameter #4
9	Calibration method for parameter #5
10	Calibration method for parameter #6
11	Calibration method for parameter #7
12	Calibration method for parameter #8

9.3.3 Calibration Method types

0-None

1-Offset Result = X+offset

2-Offset(360Deg)Result = X+offset

3-Slope, Offset Result = (X+offset)*slope

4-Polynomial Result = X+AX2+BX+C (2-10 coefficients)

5-Polynomial Result = AX2+BX+C (2-10 coefficients)

6-Polynomial Result = X+AX2+BX+C+DT (2-10 coefficients)

7-Polynomial Result = AX2+BX+C+DT (2-10 coefficients)

8-LWR calculation (Tbody, Tdome, microvolts)

9-Thermistor resistance to temperature calculation from A B C coeffs.

Excitation volts, series resistance, A, B, C, Slope, offset

10-RTD resistance to temperature Calculation from Rtp Rga Rrtd

11-Seabird T

12-Seabird C

13-Slope, Offset Result = (X*slope+offset) * Y

14-Slope, Offset, DT (Weatherpak BP cal)

15-Dew Point Calculation from HRH

16-Seawater Salinity Calculation From TSG

17-Seawater Density Calculation From TSG

18-Seawater Sound Velocity Calculation From TSG

19-True Wind Speed Calculation From Relative Wind

20-True Wind Direction Calculation From Relative Wind

21-Seawater Oxygen Calculation From SBE13

22-Seawater Oxygen Calculation From SBE43

23-Oxygen Saturation value of Seawater

24-Beam Attenuation from slope, offset, path length (meters)

25-pH from SBE-18 slope, offset

Notes:

Sensor Type OXY should always be calibrated to ml/l.

Sensor Type WND should always be calibrated to M/S.

Sensor Type FLW should always be calibrated to LPM.

Refer to section 11 for information on calculation methods.

9.3.4 Examples of setting up an Input Module section

Example #1

The Eppley acquires thermopile data from a millivolt to RS485 converter. The Body and Dome temperature values are acquired from a different RS485 converter. If values come from more Than one source then use the CMD and MSP Keys for each source. First source use CMD, 2^nd source use CMD2, 3^rd source use CMD3. Default Tags and precision are used so they do not need to be specified.

[LWR00]

SENSOR = Long Wave Radiation

MODEL = PIR

SERIAL = 29929F3

MFG = Eppley Labs

CAL_LAB = Eppley

CAL_DATE = 25-SEP-02

LOCATION = Forward MET Mast (TOP)

OWNER = SIO/STS

# DGH D2102 0-10mv VDC (Thermopile)

# DGH D5132 0-5v VDC (Dome Temp, Body Temp)

CMD = #p\r

CMD2 = #q\r

CMD3 = #m\r

# Module setup parameters

MSP = 3 1 0 0 10 0 1 1 0 0 0 0 0 0 0

MSP2 = 3 1 0 0 10 0 1 1 0 0 0 0 0 0 0

MSP3 = 3 1 0 0 10 0 1 1 0 0 0 0 0 0 0

MCP = 1 1 4 3 9 9 3 8 0 0 0 0

# Emulation values

Emulation = 1200 1200 114.7

AVGTYPE=1 1 1 1

SECSTOAVG=10.0

# A/D Calibration

ADCAL = 0.001, 0.0

# Dome, Body, Thermopile

# Corrections for Dome Glass Temp sensor

COR = 10.0, 82500, 0.0010295, 0.0002391, 1.568e-7, 1.0, 0.0

# Corrections for Body Temp sensor

COR2 = 10.0, 82500, 0.0010295, 0.0002391, 1.568e-7, 1.0, 0.0

# Eppley correction factors

# Thermopile Slope Offset (in uv)

COR3 = 1000.0, 0.0

# Eppley factor, Stefan-Boltzmann Const, absorption/dome glass IR

# Cal Factor 3.65e-6 volts/watts meter -2

COR4 = 3.78e-6, 5.6697e-8, 1.97

# Serial Port and Sensor Configuration section

UNIT3 1 COMM3 9600 NONE 8 1 RS485 – LWR Sensor

Example #2

Suppose you have a fluorometer that outputs RS232 data at 9600 baud and you want to connect to to the MET PC comm port #3. No calibration factors applied by the program. You are interested only in logging the corrected fluorescence and turbidity.

The sensor outputs the following data stream:

Turner SCUFA II (PCdate, PCtime, Raw-fluorescence, Temp-corr-fluorescence, Turbidity, Uncalib-temperature)

02/28/01 15:11:45 13.502 13.807 0.410 26.6<cr><lf>

First, identify the sensor type as a Fluorometer then assign a unique two-number Sensor ID. From section 2 you find that the fluorometer is type FLU. Then assign a unique two-number code (E.g. FLU11). Only one defined sensor of each type is allowed. It is not permissible to have more than one FLU11 in the system.

Enter the new Sensor as [FLU11]. Then enter information about the sensor.

[FLU11]

SENSOR = Fluorometer

MODEL = SCUFA II

SERIAL = 12345

MFG = Turner

CAL_LAB = Turner

CAL_DATE = 01-FEB-2003

LOCATION = AFT LAB – Revelle

OWNER = MLRG

COMMENTS = Used on Calcofi Cruise Feb-2003

# For an RS232 port “CMD = “ must be Zero

CMD = 0

# Module setup parameters

# 1 serial port unit number. 2 Device – RS232 Port

# 3, 4 – 0 4 Termination character (decimal value) – 10 (Line Feed)

# 5 – 0 6 – Number of values returned

# 7 Index number of Fluorometer value (3^rd position in string)

# 8 Index number of Turbidity value (4^th position in string)

# 9-14 unused

MSP = 4 3 0 0 10 0 6 3 4 0 0 0 0 0 0

MCP = 0 1 2 0 0 0 0 0 0 0 0 0

# Since the default tag setting is FL then in order to acquire both FL and TB it is

# necessary to overide the defaults then the Precision also needs to be specified.

TAGS-R = FL TB

TAGS-C = FL TB

PRC-R = 3 3

PRC-C = 3 3

EMULATION = 13.502 0.410

ADCAL = 1.0 0.0

COR = 1.0, 0.0

COR2 = 1.0, 0.0

# Serial Port and Sensor Configuration section

UNIT4 1 COMM4 9600 NONE 8 1 RS232 Input - SCUFA II Fluorometer

9.4.0 Output Module Setup Section

In addition to the standard output Data files (section 10) and standard pre-defined serial data output formats that are described in section 8 it is possible to generate custom user defined output data format(s). These defined formats are specified in an output module section of the ACQ file. Data can be output to any number of available serial ports and/or written to any number of user files. For each defined output module, a separate user file is written and/or a separate message is output to a serial port. Any number of user defined output modules can be specified for most kinds of desired outputs. So it is possible to output different messages out different serial ports and/or written to different files. Output modules are specified in the .ACQ file in a section that starts with OUT followed by two identifier digits. The first defined output module will be setup in a section called OUT01.

Output Module Key names

Keys	Description	Example
SERUNITNUM	Serial Output Unit Number 0 – Disable Serial Output >0 Enable Serial Output on designated UNIT. If Serial output is enabled: In the Serial Port configuration section in the column just after UNIT# set function to 20	SERUNITNUM=2 Output data on port designated by Unit #2 Function for Unit#2 Set Function to 20
PARAMETERS	MET Parameter tag (from Appendix A)	PARAMETERS=AT BP LA LO
PARAMETER NUMBERS	MET Parameter Sensor number 0 – First sensor 1 – Second Sensor 2 – Third Sensor (and so on)	PARAMETER NUMBERS= 0 0 0 0
PRECISION	Number of decimal places for each parameter	PRECISION=3 3 5 5
INTERVAL	Time Interval (in seconds that data is either Stored in a file and/or output to a serial port	INTERVAL=10.0
MK_OUTFILE	Enables/Disables writing the selected data to a USER File	MK_OUTFILE=TRUE
ADDCRC	Enables/Disables Addition of NMEA style Checksum to end of line	ADDCRC=TRUE
ADDTIMESTAMP	Enables/Disables Time stamp at the beginning of each line	ADDTIMESTAMP=TRUE
LEADER	Specify any desired leader string	LEADER=$WIUSER
NMEA	Specify one or more standard NMEA message(s) to include in the output. If no NMEA messages are desired then do not specify this key. NMEA messages that can be output: GGA, GLL, RMC, VTG, ZDA, HDT, DBT, MWD, MTW and XDR	NMEA=GGA VTG ZDA

An example of an output module will look like:

[OUT01]

SERUNITNUM = 2

PARAMETERS= AT BP RH LA LO

PARAMETER NUMBERS = 0 0 0 0 0

PRECISION = 3 3 3 5 5

MKOUTFILE = TRUE

INTERVAL = 10.0

ADDCRC = TRUE

ADDTIMESTAMP = TRUE

LEADER = $WIUSR

NMEA = GGA, VTG, ZDA

This will produce an output that looks like:

$WIUSR,180000,20.000,1010.000,80.123,32.12345,-117.12345*A0

$GPGGA,225531.811,3241.3954,N,11708.6334,W,1,08,1.4,033.1,M,036.0,M,,*7F

$GPVTG,000.0,T,346.8,M,000.0,N,000.0,K*47

$GPZDA,225533.00,21,03,2003,00,00,*4B

All above four lines of data will be output on Serial Port#2 every 10 seconds.

This will also be written to a file in the data directory every 10 seconds.

[OUT02]

SERUNITNUM = 3

PARAMETERS= AT BP RH LA LO GY SP

PARAMETER NUMBERS = 0 0 0 0 0 0 0

PRECISION = 3 3 3 5 5 1 1

MKOUTFILE = FALSE

INTERVAL = 5.0

ADDCRC = FALSE

ADDTIMESTAMP = FALSE

This will produce an output that looks like:

25.123,1010.000,75.000,32,12345,-117.12345,270.0,10.0

In this case data goes out port#3 every 5 seconds. No NMEA messages, Data not written to file. No leader, no timestamp and no Checksum.

For each defined output module a different file name will be assigned. For the first defined output module the file name will be something like 030401.M00. For each additional output that may be defined the number will increment by one. E.g. a second defined output module will be 030401.M01

All data will always be written to the standard data files regardless of (if or how) any output modules are defined or specified. The standard data files are described in the next section.

10. Data File Format

10.1.0 MET data file format description

The acquisition program generates at least two files. One file is corrected data, which is the sensor return value that has calibration corrections applied within the acquisition program. The other file is uncorrected data which is the sensor return value unaltered by the program. The corrected data file is of type .MET. The Uncorrected data file is of type .UCR. If enabled, the program will also generate additional files written in the Translator format. These files are of type .COR and .UNC.

Data files start upon program execution or at the beginning of each (GMT) day beginning at 0000Z. At the end of the day at 2359Z the file is closed and a new set of files start again at 0000Z the next GMT day.

MET, UCR Files:

Four lines of header information begin the file

1. Shipname title information

2. Date, Time

3. Data type - Uncorrected or Corrected data

4. Header - Each data parameter is identified using this line

An abbreviated example of a MET corrected data file follows:

# R/V New Horizon Meteorological Data Center

# Fri 16-Aug-2002 19:37:22

# Met Data - Corrected

#Time AT BP WS WD RH LA LO CR SP

193722 30.03 1002.94 6.0 10.0 70.43 32.345600 -117.567800 45.0 10.0

193752 30.03 1002.94 6.0 10.0 70.43 32.345600 -117.567800 45.0 10.0

193822 30.03 1002.94 6.0 10.0 70.43 32.345600 -117.567800 45.0 10.0

An abbreviated example of a UCR uncorrected data file follows:

# R/V New Horizon Meteorological Data Center

# Fri 16-Aug-2002 19:37:22

# Met Data - Uncorrected

#Time AT BP WS WD RH LA LO CR SP

193722 0.70000 3.70000 6.00 10.00 0.70000 32.345600 -117.567800 45.0 10.0

193752 0.70000 3.70000 6.00 10.00 0.70000 32.345600 -117.567800 45.0 10.0

193822 0.70000 3.70000 6.00 10.00 0.70000 32.345600 -117.567800 45.0 10.0

The order that each sensor data is stored is determined in the Module selection section in the acquisition and calibrations setup file (See section 9.1).

The precision of any stored data point is determined by use of the PRC key name (Section 9.3.0).

The header line in the MET and UCR files use a two-character parameter ID to identify the data.

If, for example, a second air temperature sensor were added, it would be identified in the header as AT-2 (See Appendix A).

COR, UNC Files:

The .COR and .UNC files are in the DOS translator format and are used in those applications that expect the MET data to be in this format.

These files will only be generated if enabled in the [GENERAL] section of the ACQ file.

[GENERAL]

MK_COR = TRUE

MK_UNC = TRUE

An abbreviated example of a Translator COR corrected data file follows:

$WICOR,020902,140316,30.03,AT8,1002.94,BP8,6.0,WS8,10.0,WD8,70.43,RH8,32.345600,LA8,

-117.567800,LO8,45.0,CR8,10.0,SP8*06

$WICOR,020902,140346,30.03,AT8,1002.94,BP8,6.0,WS8,10.0,WD8,70.43,RH8,32.345600,LA8,

-117.567800,LO8,45.0,CR8,10.0,SP8*06

An abbreviated example of a Translator UNC uncorrected data file follows:

$WIUNC,020802,140316,0.70000,AT8,3.70000,BP8,25.00,BC8,6.00,WS8,10.00,WD8,0.70000,RH8,0.70000,RT8,32.345600,LA8,-117.567800,LO8,45.0,CR8,10.0,SP8*10

$WIUNC,020802,140346,0.70000,AT8,3.70000,BP8,25.00,BC8,6.00,WS8,10.00,WD8,0.70000,RH8,0.70000,RT8,32.345600,LA8,-117.567800,LO8,45.0,CR8,10.0,SP8*10

The WICOR and WIUNC files contain Data Corrected and Data Uncorrected files respectively. The file name indicates the date (yymmdd) plus the extension .COR for corrected data or .UNC for uncorrected. Each line begins with the title $WICOR or $WIUNC to identify corrected or uncorrected data, followed by the date (ddmmyy) and time (hhmmss). The MET sensor data follows in the sequence it was acquired as specified in the sensor enable section. The data is followed by latitude, longitude, course, speed and gyro. Each data point in the .COR and .UNC files has a 2 character ID to identify it. There is also a third character to help clarify the type of data. E.g. +25.3,AT0 (air temperature, calibrations not applied).

0 - Calibration coefficients not applied

1 - Calibration coefficients applied in Sensor Module

2 - Calibration coefficients applied in Acquisition computer

3 - Calibration coefficients applied in Sensor Module and Acquisition computer

7 - Data Out of Range

8 - Data is Emulated (Not Real)

9 - Data invalid

Any data file can be used to regenerate a file of another type when in PLAYBACK

MODE. For example when playing back a file of type .UCR you can generate files of type .MET, .COR and .UNC. When playing back of type .MET you can generate a file of type COR. When in PLAYBACK MODE be sure to enable the FILE WRT Control in the control panel after selecting the data file to playback.

10.2.0 MET log file description

When MK_LOG is set to TRUE the program will generate a log and status file one every day at about 2200 GMT. This file gives information on sensor operational status, sensor configuration, the source of MET parameters and information on what parameters are written to the data files.

It also indicates the currently selected .ACQ setup/configuration file and active sensor modules.

The file name is of type .LOG.

when MK_LOG is set to TRUE the program makes a copy of the currently selected .ACQ file to the filename of type .ACQ.

If the program wrote data and log files on April 27, 2003 the file names would be

030427.MET Corrected data file

030427.UCR Uncorrected data file

030427.ACQ Copy of currently selected setup/cal file

030427.LOG Met system LOG and status file

11. MET System Calculation Methods.

MET sensor parameters are calibrated to output data in units according to the MET parameter list in appendix A. Raw data from sensors are usually corrected using either slope/offset or polynomial corrections using coefficients obtained from sensor calibration sheets. Some parameters are calculated using oceanographic or atmospheric algorithms. These parameters include seawater salinity, density, sound velocity, oxygen; true wind speed/direction, dew point and long wave radiation.

Surface Seawater calculations:

Seawater Temperature data that are displayed and recorded in data files are calibrated to *ITS(T90). Seawater Salinity calculations in *PSU are derived according to *PSS 1978 using *TSG temperature and conductivity values. Surface seawater sound velocity (M/S) calculations are made using TSG temperature and TSG salinity values according to the Chen/Millero 1977 equation. Seawater oxygen values are calculated using oxygen temperature, oxygen current, oxygen saturation and seawater salinity values. Oxygen saturation is first calculated, then oxygen is calculated to ml/l. Seawater temperature is converted internally to *ITS(T68) prior to calculating salinity, density, sound velocity and oxygen. References in section 11.1.0.

*Thermosalinograph(TSG)

*Practical Salinity Units

*PSS 1978 Practical Salinity Scale 1978

*ITS(T68) International Temperature Scale of 1968 ITS-68

*ITS(T90) International Temperature Scale of 1990 ITS-90

Wind Calculations:

Wind Direction is defined as the direction from which the wind is coming from.

True Wind Speed and direction are calculated using relative wind speed, relative wind direction, Ship’s heading (Gyrocompass), Ships course (GPS COG) and Ships speed (GPS SOG). All wind corrections and True wind calculations are applied and computed prior to doing any averaging. Averaging (if enabled) is then performed on the individual components of relative wind speed/direction and true wind speed/direction. True Wind calculations are computed according to the WOCE-MET publication on True Winds listed in the References in section 11.1.0.

Dew Point Calculation:

Dew point is calculated using relative humidity, air temperature and barometric pressure.

Long Wave Radiation (Pyrgeometer):

LW irradiance in W m^-2 is calculated using thermopile volts, body temperature, dome temperature and calibration factor from instrument calibration sheet.

References in section 11.1.0.

11.1.0 REFERENCES

Surface Seawater Salinity

Lewis, E. L., 1980. The Practical Salinity Scale 1978 and Its Antecedents. IEEE Journal of Oceanographic Engineering,OE-5, 3-8.

Culkin, F. and Smith, N. D., 1980. Determination of the Concentration of Potassium Chloride Solution Having the Same Electrical Conductivity, at 15C and Infinite Frequency, As Standard Seawater of Salinity 35.0000ppt (Chlorinity 19.37394ppt), IEEE Journal of Oceanographic Engineering, Vol. OE-5, No. 1.

UNESCO, 1981, Background Papers and Supporting Data on the Practical Salinity Scale 1978, Technical Papers in Marine Science, No. 37.

Surface Seawater Sound Velocity

Millero, F.J. and Li, X., "Comments on 'On equations for the speed of sound in seawater'" 1994,JASA,95,2757-2759. Chen & Millero, 1977,JASA,62,1129-1135.

Surface Seawater Density

Millero, F. J., Chen, C. T., Bradshaw, A. and Schleicher, K., 1980 A New High Pressure Equation of State for Seawater. Deep-Sea Research 27A, 255-264.

Fofonoff, N. P. and Millard, R. C., 1983. Algorithms for Computation of Fundamental Properties of Seawater. UNESCO Report No. 44, 15-24.

Surface Seawater Oxygen

Seabird SBE43 Dissolved Oxygen Sensor Application Note No. 64

References Listed in Seabird Application Note No. 64

Gnaigner, E., and H. Forstner, Ed., 1983: Polarographic Oxygen Sensors: Aquatic and Physiological Applications, pringer-Verlag, 370 pp.

Millard, R, C., Jr., 1982: CTD calibration and data processing techniques at WHOI using the 1978 practical salinity scale. Proc. Int. STD Conference and Workshop, La Jolla, Mar. Tech. Soc., 19 pp.

Owens, W.B., and R.C. Millard Jr., 1985: A new algorithm for CTD oxygen calibration. J. Physical Oceanography, 15, 621-631.

Weiss, R.F., 1970: The solubility of nitrogen, oxygen and argon in water and seawater. Deep-Sea Res., 17, 721-735.

True Wind Calculations

Wind WOCE MET Calculations of True Winds.

Shawn R. Smith, Mark A. Bourassa, and Ryan J. Sharp, 1999: Establishing more truth in true winds, Published: December 99, Vol. 16, pp. 939-952 Center for Ocean-Atmospheric Prediction Studies (COAPS).

Long Wave Radiation

Albrecht, B., and S. K. Cox. 1977. "Procedures for Improving Pyrgeometer Performance." Journal of Applied Meteorology 16:188-197

Fairall, C.W., P.O.G. Persson, E.F. Bradley, R.E. Payne, and S.P. Anderson, 1998. A new look at calibration and use of Eppley precision infrared radiometers. Part I: Theory and Application. Journal of Atmosphere and Oceanic Technology, 15, 1229-1242.
Payne, R.E. and S.P. Anderson, 1999. A new look at calibration and use of Eppley precision infrared radiometers. Part II: Calibration and use of the Woods Hole Oceanographic Institution Improved Meteorology Precision Infrared Radiometer. Journal of Atmosphere and Oceanic Technology, 16, 739-751.

Philipona, R., C. Frohlich, and C. Betz, 1995: Characterization of pyrgeometers and the accuracy of atmospheric long-wave radiation measurements. Applied Optics: Lasers, Photonics, and Environmental Optics, 34, 1598–1605.

Appendix A MET Parameter Index

0	AT	Air Temperature	Deg C
1	BP	Barometric Pressure	mb
2	BC	Barometric Pressure Temp	Deg C
3	SW	Short Wave Radiation (SWR)	W/M^2 (Pyranometer)
4	LW	Long Wave Radiation (LWR)	W/M^2 (Pyrgeometer)
5	LD	LWR Dome Temperature	Deg K
6	LB	LWR Body Temperature	Deg K
7	LT	LWR Thermopile	Volts
8	PR	Precipitation	mm
9	PT	Precipitation	mm/hr
10	RH	Relative Humidity	%RH
11	RT	Air Temp (RH module)	Deg C
12	DP	Dew Point	Deg C
13	WS	Rel Wind Speed	M/S
14	WK	Rel Wind Speed	Knots
15	TW	True Wind Speed	M/S
16	TK	True Wind Speed	Knots
17	WD	Rel Wind Direction	Deg (Direction wind is coming from)
18	TI	True Wind Direction	Deg (Direction wind is coming from)
19	ST	Sea Surface Temperature	Deg C
20	TT	SBE21 Temperature	Deg C
21	TC	SBE21 Conductivity	mS/m
22	SA	Salinity	PSU
23	SD	Sigma-t	Kg/m^3
24	SV	Sound Vel (Chen/Millero)	M/S
25	OX	Oxygen	ml/l
26	OG	Oxygen	mg/l
27	OC	Oxygen Current	ua
28	OT	Oxygen Temperature	Deg C
29	OS	Oxygen Saturation value	ml/l
30	PH	Alkalinity (pH)
31	FL	Fluorometer	ug/l
32	TB	Turbidity	NTU
33	TR	Transmissometer	%
34	BA	Beam Attenuation
35	PA	Surface PAR	uE/Second/Meter^2
36	FM	USW Flow Meter	GPM
37	FI	USW Flow Meter	LPM
38	VT	Volts	Volts
39	MA	Current	m/a
40	WT	Auxiliary water Temp	Deg C
41	AX	Auxiliary Air Temperature	Deg C
42	PS	Pressure	PSI
43	XX	Unspecified
44	LA	Latitude Decimal format	Deg
45	LO	Longitude Decimal format	Deg
46	CR	Ships Course (GPS COG)	Deg
47	SP	Ships Speed (GPS SOG)	Knts
48	SL	Ship’s Speed (Speed Log SOW)	Knts
49	GY	Ships Heading (Gyrocompass)	Deg
50	GT	GPS Time of Day	GMT Secs 0-86400
51	TS	Time Server Time of Day	GMT Secs 0-86400
52	ZD	GPS DateTime	GMT Secs Since 00:00:00 01/01/1970
53	SY	System DateTime	GMT Secs Since 00:00:00 01/01/1970
54	BT	Bottom Depth	Meters
55	SH	Ashtech Heading	Deg
56	SM	Ashtech Pitch	Deg
57	SR	Ashtech Roll	Deg
58	ZO	Winch Wire Out	Meters
59	ZS	Winch Speed	MPM
60	ZT	Winch Tension	LBS
61	VP	VRU Pitch	Deg
62	VR	VRU Roll	Deg
63	VH	VRU Heave	Meters
64	VY	Ship’s List	Deg
65	VX	Ship’s Trim	Deg

Appendix B NMEA-0183 Standard Sentence Formats

National Marine Electronics Association NMEA-0183 Standard Sentences

The Following NMEA-0183 Sentences can be utilized by the MetAcq Program.

$GPGGA - Global Positioning System Fix Data

$GPGLL - Geographic Position, Latitude/Longitude

$GPRMC - Recommended Minimum Specific GPS/TRANSIT Data

$GPVTG - Track Made Good and Ground Speed

$GPZDA - UTC Date / Time and Local Time Zone Offset

$HEHDT - Heading, True

$WIMWD - Wind Direction

$WIMWV - Wind Speed and Angle

$WIXDR - Transducer Measurements

$WIMTW - Water Temperature

$SDDBT - Depth Below Transducer

NMEA Talker Identifiers

GP – Global Positioning System (GPS)

GN – Global Navigation Satellite System (GNSS)

GL – GLONASS Receiver

HE – Heading Sensor, North Seeking

SD – Sounder, Depth

WI – Weather Instruments

$GPGGA Global Positioning System Fix Data

$GPGGA,180432.00,4027.027912,N,08704.857070, W,2,07,1.0,212.15,M,-3.81,M,4.2,0555*73

Field	Value	Meaning
1	180432.00	UTC of position fix in hhmmss.ss
2	4027.027912	Geographic latitude in ddmm.mmmmmm format
3	N	Direction of latitude (N - North, S - South)
4	08704.857070	Geographic longitude in dddmm.mmmmmm
5	W	Direction of longitude (E - East, W - West)
6	2	GPS quality indicator 0-fix not valid 1-GPS fix 2-DGPS fix 3-GPS PPS 4-RTK fixed Integers 5-RTK floating Integers 6-Deck Reckoning 7-Manual Input 8-Simulator Mode
7	07	Number of satellites in use (00-12)
8	1.0	Horizontal DOP
9	212.15	Antenna height above MSL (mean sea level) reference
10	M	Unit of altitude (meters)
11	-33.81	Geoidal separation (-33.81 m)
12	M	Unit of geoidal separation (meters)
13	4.2	Age of differential GPS data record
14	0555	Base station ID (0000-1023)

Each NMEA Sentence ends with a checksum delimeter “*” Followed by a two hexadecimal character checksum. The sentence terminates with <CR><LF>

$GPGLL Geographic Position – Latitude/Longitude

$GPGLL,4027.027912,N,08704.857070,W, 180432.00,A,D*7A

Field	Value	Meaning
1	4027.027912	Geographic latitude in ddmm.mmmmmm
2	N	Direction of latitude (N - North, S - South)
3	08704.857070	Geographic longitude in dddmm.mmmmmm
4	W	Direction of longitude (E - East, W - West)
5	180432.00	UTC of position fix in hhmmss.ss format
6	A	'A' shows that data is valid
7	D	Mode Indicator