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

CDM-570/570L Satellite Modem with Optional IP Module

Remote Commands:

Several new remote commands are added to enable the GPS Mode and retrieve GPS
information. These new commands are for the SLAVE modem ONLY, which means the
address field must be the address of the Slave unit, for example 0021.
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GPS – GPS Mode, Query and Command
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DTM? – Retrieve GPDTM data sentence
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GGA? – Retrieve GPGGA data sentence
•
ZDA? – Retrieve GPZDA data sentence
•
GLL? – Retrieve GPGLL data sentence
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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,,*7F[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]
0 = Disabled
1 = Enabled
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.
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
Addendum A - 2
GPS Mode Description