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Gill Instruments Ltd
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6.6.
Configuring a MetPak for NMEA Output
Applicable to MetPak units
Not applicable to MetPak RG and MetPak Pro.
Connect a default set MetPak to a PC as described in Para 4.9.
Set unit for NMEA output using MetSet.
Open MetSet as described on Para 6.2 and click on the Reporting page.
Change the Report Format drop down menu from USERDEF to NMEA.
On the Comms Page select the required Interface, generally RS422.
On the Comms Page Select the required Baud rate, normally 4800 bauds (or sometimes 9600
baud).
Click on Save Settings to Device.
Alternatively set for NMEA using a Terminal Program.
Open a Terminal program (such as Tera term/Putty/HyperTerminal).
Place the MetPak into SETUP MODE by Typing the * command.
Type REPORT NMEA and press Enter.
Type BAUD 4800 and press Enter.
Type COMMS RS422 and press Enter. Until the unit is restarted, the COMMS setting will remain
unchanged.
Shut down the MetPak unit.
Change the hardware connections for RS422 communication.
Restart the MetPak unit.
Example NMEA data string produced at the output rate (default every 1Hz):-
$WIMWV,008,R,000.09,N,A*0C
$WIXDR,C,+023.0,C,TEMP,P,1.0199,B,PRESS,H,039.6,P,RH*33
The NMEA data string comprises of: -
$WIMWV,008,R,000.09,N,A*0C,<CR>,<LF>
Where: -
$WIMWV
008
R
000.09
N
A
OC
And
$WIXDR,C,+023.0,C,TEMP,P,1.0199,B,PRESS,H,039.6,P,RH*33,<CR><LF>
Cont.
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MetPak/MetPak RG and MetPak Pro
Doc. No. 1723-PS-0022
Part 1723-1B-2-111 o
Wind Instrument Mean Wind direction and Velocity
Wind Direction
Wind Measurement Relative to the North Marker
Wind Speed
Knots (NMEA output fixed to Knots measurement only)
Acceptable measurement (V is a void fail measurement)
Hex CheckSum
Page | 63
nly.
Issue 1
October 2018
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