Rainbow-electronics GE863-GPS low power Manual de usuario descargar pdf (Pagina 114)

GE863-GPS Software User Guide

1vv0300724 Rev. 3 - 05/07/07

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 (NMEA) CMOS 2.8V

73 RX_GPS GPS RX Data (NMEA) CMOS 2.8V

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.

1 2 ... 109 110 111 112 113 114 115 116 117 118 119 120 121 122

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Rainbow-electronics GE863-GPS low power Manual de usuario Pagina 114