Globalsat ET-314 GPS Engine Board [17/22] Psrf103 00 01 00 01 25

ET-314AC

High Performance GPS Engine Board

2010/4/1

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C). Set DGPS Port ID: 102 Set PORT B parameters for DGPS input

This command is used to control the serial port used to receive RTCM differential corrections.

Differential receivers may output corrections using different communication parameters. If a

DGPS receiver is used that has different communication parameters, use this command to allow

the receiver to correctly decode the data. When a valid message is received, the parameters are

stored in battery-backed SRAM and the receiver restarts using the saved parameters.

Table B-5 contains the input values for the following example:

Set DGPS Port to 9600 baud, 8 data bits, 1 stop bit, no parity bit.

$PSRF102,9600,8,1,0*12

Table B-5 Set serial Port Data Format

Name Example Units Description

Message ID $PSRF102 PSRF102 protocol header

Baud 9600 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200

DataBits 8 8,7. Note that SiRF protocol is only valid for 8 Data bits

StopBits 1 0,1

Parity 0 0=None, 1=Odd, 2=Even

Checksum *12

<CR><LF> End of message termination

D). Query/Rate Control ID: 103 Query standard NMEA message and/or set output rate

This command is used to control the output of standard NMEA messages GGA, GLL, GSA, GSV,

RMC, and VTG. It also controls the ZDA message in software that supports it. Using this

command message, standard NMEA messages may be polled once, or setup for periodic output.

Checksums may also be enabled or disabled depending on the needs of the receiving program.

NMEA message settings are saved in battery-backed memory for each entry when the message

is accepted.

Table B-6 contains the input values for the following example:

Query the GGA message with checksum enabled

$PSRF103,00,01,00,01*25

Table B-6 Query/Rate Control Data Format

Name Example Unit Description

Message ID $PSRF103 PSRF103 protocol header

Msg 00 Message to control. See Table B-7