Gill Instruments Ltd
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MetPak/MetPak RG and MetPak Pro
Page | 63
Issue 1
Doc. No. 1723-PS-0022
October 2018
6.6.
Configuring a MetPak for NMEA Output
Applicable to MetPak units
Part 1723-1B-2-111 o
nly.
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
Wind Instrument Mean Wind direction and Velocity
008
Wind Direction
R
Wind Measurement
R
elative to the North Marker
000.09
Wind Speed
N
Knots (NMEA output fixed to Knots measurement only)
A
Acceptable measurement (V is a void fail measurement)
OC
Hex CheckSum
And
$WIXDR,
C,+023.0,C,TEMP
,P,1.0199,B,PRESS,
H,039.6,P,RH
*33,<CR><LF>
Cont.
