Remote Commands - Comtech EF Data CDM-570A Installation And Operation Manual

K.3

Remote Commands

For more information about using remote commands and queries,
see Chapter 8. SERIAL-BASED REMOTE PRODUCT MANAGEMENT.
Several remote commands are available to enable the GPS Mode and retrieve GPS information.
These commands are for the SLAVE modem ONLY, which means the address field must be the
address of the Slave unit (e.g., 0021).
•
GPS – GPS Mode, Query and Command
Note: When the GPS mode is enabled, the SLAVE modem's serial's Baud Rate is changed to 4800
to receive data from GP-320B. To go back to normal serial operation mode, disable the GPS Mode.
•
DTM? – Retrieve GPDTM data sentence
•
GGA? – Retrieve GPGGA data sentence
•
ZDA? – Retrieve GPZDA data sentence
•
GLL? – Retrieve GPGLL data sentence
•
VTG? – Retrieve GPVTG data sentence
•
RMC? – Retrieve GPRMC data sentence
Example capture of the remote commands:
<0021/GPS?
>0021/GPS=0[cr][lf]
<0021/GPS=1
>0021/GPS=[cr][lf]
<0021/DTM?
>0021/DTM=$GPDTM,W84,,00.0000,N,00.0000,W,,W84*53[cr][lf]
<0021/GGA?
>0021/GGA=$GPGGA,222830,3325.4268,N,11158.2640,W,0,01,00.00,000293.6,M,-026.2,M,,*7
F[cr][lf]
<0021/ZDA?
>0021/ZDA=$GPZDA,223145,14,10,2005,+00,00*63[cr][lf]
<0021/GLL?
>0021/GLL=$GPGLL,3325.4268,N,11158.2640,W,222830,V,N*47[cr][lf]
<0021/VTG?
>0021/VTG=$GPVTG,,T,,M,,N,,K,N*2C[cr][lf]
<0021/RMC?
>0021/RMC=$GPRMC,222830,V,3325.4268,N,11158.2640,W,,,141005,011.8,E,N*12[cr][lf]
<0021/GPS=0
>0021/GPS=[cr][lf]
<0021/RMC?
>0021/RMC*[cr][lf]
GPS Mode
CDM-570A/570AL Satellite Modem with Optional Packet Processor
0 = Disabled
1 = Enabled
Queries current GPS status
SLAVE responds that GPS is disabled
SLAVE is commanded to enable GPS
SLAVE confirms that GPS is enabled
SLAVE is commanded to return GPDTM data sentence
SLAVE is commanded to disable GPS
SLAVE confirms that GPS is disabled
SLAVE is commanded to return GPRMC data sentence
SLAVE responds that data is not available
K–2
Revision 5
MN-CDM570A