Rainbow Electronics GE863-GPS low power - Manual (Page 114)

GE863-GPS Software User Guide
1vv0300724 Rev. 3 - 05/07/07
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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
68 TX_GPS GPS TX Data (N MEA) CMOS 2.8 V
73 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 Data *CKSUM
Fields descriptions:
$PSRF
This identifies the command and the parameter (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
definition.