USGlobalsat EM-318-01 - Manual (Page 14)

EM-318-01
Specifications are subject to be changed without notice.
Page 14 of 16
Version 1.2.2
Example: Start using known position and time.
$PSRF101,-2686700,-4304200,3851624,96000,497260,921,12,3*7F
C.) Set DGPS Port ID:102 Set PORT B parameters for DGPS input
This command is used to control Serial Port B, an input serial only port used to receive RTCM
differential corrections. Differential receivers may output corrections using different communication
parameters. The default communication parameters for PORT B are set for 9600 Baud, 8data bits, 0
stop bits, and no parity. If a DGPS receiver is used which has different communication parameters,
use this command to allow the receiver decode data correctly. When a valid message is received, the
parameters are stored in a battery backed SRAM. Resulting, GPS receiver using the saved
Parameters for restart.
Format:
$PSRF102,<Baud>,<DataBits>,<StopBits>,<Parity>*CKSUM<CR><LF>
<baud>
1200,2400,4800,9600,19200,38400
<DataBits> 8
<StopBits> 0,1
<Parity> 0=None,Odd=1,Even=2
Example: Set DGPS Port to be 9600,8,N,1
$PSRF102,9600,8,1.0*12
D.) Query/Rate Control ID:103 Query standard NMEA message and/or set output rate
This command is used to control standard NMEA data output messages: GGA, GLL, GSA, GSV, RMC,
and VTG. Using this command message, standard NMEA message is polled once, or setup for
periodic output. In addition, checksums may also be enable or disable contingent on receiving
program requirements. NMEA message settings are stored in a battery-backed memory for each entry
when the message is accepted.
Format:
$PSRF103,<msg>,<mode>,<rate>,<cksumEnable>*CKSUM<CR><LF>
<msg> 0=GGA,1=GLL,2=GSA,3=GSV,4=RMC,5=VTG
<mode> 0=SetRate,1=Query
<rate> Output every <rate>seconds, off=0,max=255
<cksumEnable> 0=disable Checksum,1=Enable checksum for specified message
Example 1: Query the GGA message with checksum enabled
$PSRF103,00,01,00,01*25
Example 2: Enable VTG message for a 1Hz constant output with checksum enabled
$PSRF103,05,00,01,01*20
Example 3: Disable VTG message
$PSRF103,05,00,00,01*21