190 G12 OEM Board & Sensor Reference Manual
RTCM commands allow you control and monitor operation in differential mode.
RTCM commands are available if the differential options are installed. If only the
base station option [B] is installed, only commands controlling base station
parameters are available when setting the receiver for differential operation. If only
the remote differential option [U] is installed, only commands controlling remote
station parameters are available when setting the receiver for differential operation.
Both options must be installed in order for base station commands and remote
station commands to be available to the receiver. Please note that when the G12
is set as an RTCM base or rover, the port which is designated to output or
receive differential corrections can no longer be used to communicate with
the receiver. If the receiver has been set to output RTCM corrections through port
A, you will only be able to communicate with the receiver through port B. You must
disable differential mode in order to resume communication with the receiver
through port A. The RTCM mode is off by default.
All but one of the RTCM commands are set commands. The set commands allow
you to enable and modify a variety of parameters affecting differential operation.
There is only one query command: $PASHQ,RTC. This command is used to
monitor differential parameters and status. Table 4.117 lists the RTCM commands.
Table 4.117. RTCM Response Message Commands
Function Command Description Page
Base station
parameters
$PASHS,RTC,BAS Sets receiver to operate as differential base station 191
$PASHS,RTC,IOD Set ephemeris data update for RTCM base 192
$PASHS,RTC,MSG Defines RTCM type 16 message (base to remote) 193
$PASHS,RTC,SPD Sets baud rate of base station 197
$PASHS,RTC,STH Sets health of reference station 198
$PASHS,RTC,TYP Enable/disable RTCM message types 199
Remote station
parameters
$PASHS,RTC,AUT Turns auto differential mode on or off 191
$PASHS,RTC,MAX Sets maximum age of RTCM differential
corrections
192
$PASHS,RTC,REM Sets receiver to operate as differential remote
station
193
$PASHS,RTC,SEQ Checks sequence number of received messages 196
G12RevD.book Page 190 Tuesday, April 2, 2002 4:33 PM
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