Smart SAM3T User Guide V1.52
28
Ver1.52
Notes
-In SAMMODE=0, after power on the MCU turns on the 3G module, checks its baud rate, turns on LED
before releases control of the 3G module to the connecting device, all this take between 5 to 10 seconds,
so the modem is only ready for AT commands here after.
-In SAMMODE=1, the modem take 30 to 60 seconds to connect to GPRS, modem only response to AT
commands from serial port once it is connected to GPRS or after it has failed , if it failed to connect it
will reset after 120 seconds.
-In SAMMODE=2, the MCU take about 20 seconds to set up the 3G module , the modem only response to
AT commands from serial port after setting up is finished.
-In SAMMODE 1 and 2 if the Smart SAM3T modem is powered up without a SIM card it will go into AT
command mode after 20 seconds.
-The parameter POLLPERIOD which keep the time in minute which when expired will reset the modem if
SAMMODE=0 or SAMMODE=2, if SAMMODE=1 for PSD mode the modem will use this time to send
TRACE IP packet to check for network connectivity.
-In SAMMODE=1 and 2 the modem can be reset remotely by calling the voice number.
