CEP CT63 Benutzerhandbuch - Seite 15

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3.2 Switching OFF the modem

There are two ways to switch off (power down) the modem as described below:



use the "AT^SMSO" command



EMERG_OFF to high level for t < 1s

A delay of up to 10s is experienced as the modem logs off the network

3.3 Using low power mode of the modem

Below are some short descriptions on how to enter and exit the low power state of the modem.

3.3.1 Enabling the low power mode:



wait until the GSM module is logged onto the GSM network



send the AT command "AT+CFUN=9"



set the RTS control line from High level to Low level



after about 1-2 minutes, a stable low-power mode should be achieved

3.3.2 Disabling the low power mode by user:



Set the RTS control line from Low to High



Low-power mode should be exited automatically



The RS-232 transceiver is activated immediately



AT channel is available again after a short period of time (37ms)



If applicable send AT command "AT+CFUN=1" to remain in normal mode

3.3.3 Disable the low power modes by incoming GSM activity:



The RTS control line is still at a low level



GSM module is called or receives an SMS



Low-power mode is exited automatically



RS-232 transceiver is activated immediately



AT channel is available again after 37ms



If activated by a call the text "ring" is transmitted via the serial interface



The RTS control line on the DB-9 should be set from Low level to High level



AT communication with the GSM module is now available



If applicable send AT command "AT+CFUN =1" to remain in normal mode