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BandG WTP3 Manual

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NMEA input
nmeain.d
This le controls NMEA inputs excluding any that may be for GPS or Compass sensors. A typical use for this le is
to dene the decoding of Depth and Sea Temperature from an active NMEA sensor.
File example (Depth and Sea Temperature):
Channel 1
Device 0
Com 2 NMEA0183 4800 N 8 1
SDDBT 1 67 depth.cal null.l null.alm
YXMTW 1 60 seatemp.cal null.l null.alm
Line 1 denes the CAN Channel the module is connected to.
Line 2 denes the Device ID of the Module (NOTE: this is set via the DIP switch inside the module).
Line 3 denes the COM port settings:
COM Port COM port used [1 or 2]
Hardware Type Hardware settings for the type of data [RS232, RS485, RS422, NMEA0183]
Baud Rate Baud Rate setting to suit the input [4800, 9600, 19200, 28800, 38400, 57600, 115200]
Parity Parity setting to suit the input[N = no parity]
Data Bits To suit the input [7 or 8]
Stop Bits To suit the input [1 or 2]
Each additional line controls the decoding of NMEA sentences, as follows:
Variable Name Name of the variable, for user information only]
NMEA Field Position in NMEA sentence for required data
Variable Number Variable number where data is stored (from bg_vars.d)
Calibration File Filename of the calibration le to use
Filter File Filename of the lter/damping le to use
Alarm File Filename of the alarm le to use [optional]
Where the NMEA code is all the characters between the $ and the rst comma in the NMEA sentence and the
input eld number is equal to the number of commas before the required value, for example the le above
would decode the following input correctly (note that Depth is read in feet by default, it is converted to metres
in the calibration le):
$SDDBT,32.81,f,10.00,M,5.46,F*hh<CR><LF>
(where “f” is feet, “M” is metres and “F” is Fathoms)
$YXMTW,18.2,C*hh<CR><LF>
Special Case: The ‘XDR’ NMEA sentence is processed slightly dierently as a special case due to the possibility of
multiple inputs. The following example shows a single pressure sensor input (sensor type code “P”), decoding the
following sentence:
$IIXDR,P,1.000,B,BARO*hh<CR><LF>
… 34 …


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