7 nmea input messages, 1 transport message – Rainbow Electronics GM862-GPS User Manual
Page 112
GM862-GPS Software User Guide
1vv0300729 Rev. 5 - 05/07/07
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page 112 of 120
5.7 NMEA INPUT MESSAGES
NMEA input messages enable you to control the GPS Receiver using the NMEA SERIAL PORT.
The NMEA serial port is available only on the following pins:
PIN #
NAME
DESCRIPTION
TYPE
35
TX_GPS
GPS TX Data (N MEA)
CMOS 2.8 V
41
RX_GPS
GPS RX Data (NMEA)
CMOS 2.8 V
5.7.1 Transport Message
The message syntax is explained in the following table:
Start Sequence
Payload
Checksum
End Sequence
$PSRF<MID>
Data
*CKSUM
<CR> <LF>
Fields descriptions:
$PSRF<MID>
This identifies the command and the parameter <MID> (called Message Identifier) consists of three
numeric characters. Input messages begin at MID 100.
The following table resumes the available commands:
Message
Name
Description
100
Set Serial Port
Set serial port parameters
103
Query / Rate Control
Query standard NMEA message and/or
set output rate
105
Development Data On/Off
Development Data messages On/ Off
106
Select Datum
Selection of datum used for coordinate
transformations
Data
This field is depending to the selected command. Refer to a specific message section for <data>
definition.