Activating the GSP-1720 Control Port
How to activate the Control Port on GSP-1720:
Pre-Requisites:
- Modem does NOT have to be in view of the sky
- Antenna does NOT have to be connected. If an Active Antenna is being used, the 7VDC does NOT have to be applied to pin 22
- Modem must be powered on via +5VDC
- Pin 13 must be grounded so that modem is in IDLE state
- Terminal Emulator program (e.g., MTTTY) must be running on a computer that is attached to the GSP-1720 Data_Port
- Data_Port_DTR must be asserted so that AT command processor is active
Activate the GSP-1720 Control Port:
- Issue AT and wait for the “OK” from the modem
- to confirm that the Data Port is active
- to confirm that you have your terminal emulator set to the correct baud rate.
- Issue AT$QCCTL=1 (wait for “OK”) to activate the GSP-1720 Auxiliary port as the Control_Port
- (Integrator’s Reference Manual, pp. 6-75 – 6-76)
- Issue AT&W1 (wait for “OK”) to write the parameters to profile #1
- Issue ATZ1 (wait for the OK) to load the modem settings for profile #1
- At this point, you won’t be able to submit any more AT commands on the Data_Port, because profile #1 uses the Control_Port for AT communications
- Then lift pin 13 so it will float
- Wait 20-25 seconds for modem to go through the transition from ON==>STANDBY mode, writing all required parameters to NVRAM
- This will store the new baud rate into the Data_Port profile parameter table in NVRAM as the default.
- Turn off the power to the GSP-1720
- When you power on the modem the next time, the GSP-1720 will use the newly saved profile#
- The Control Port will be active as the AT Command port
- All AT commands must now be submitted through the Control Port
- The Control Port communicates at a fixed baud rate of 9600bps, 8/N/1, No flow control
- (Integrator’s Reference Manual, page 2-10)
.
Additional keywords: 1720, sdvm