20
Older power supplies often have large capacitors which lead to slow leading and falling edges (tying TO_IN
in parallel to VCC instead of using a separate dedicated digital signal might increase this effect)
Slow analogue signals used to assert TO_IN
If you are in doubt, please
Use the mains power adapter that is provided by your distributor and is known to work properly with your
modem.
Make sure that your signal and system design is according to the above.
Consult our support team that will be more than happy to assist you.
5.2
Configuration of the bit rate on the serial interface
Please note that autobauding is activated by default upon delivery (using the AT command “AT+IPR=0”,
please refer to Section 4.6 “AT+IPR Bit Rate” of the BGS5 AT Command Guide for further details).
5.3
Power cycle the modem
There are two ways to switch off (power down) the modem as described below:
EMERG_OFF to high level for t >1s
Turn off, or disconnect the power supply.
5.4
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.
NOTICE
Please note that the power consumption in low power mode is different according to the used method!
5.4.1
Low power mode with RTS/CTS/RING under DTE control
Enabling the low power mode:
Wait until the GSM module is logged into the GSM network
Send the AT command "AT^SPOW=2,2000,3" (activating the serial interface for 2000 ms = 2 s to receive
the wake-up AT command)
Set the RTS control line on DTE side from High level to Low level
A stable low-power mode should be achieved after approx. 1-2 minutes.
Disabling the low power mode by user:
Set the RTS control line on DTE side from Low level to High level
The RS-232 transceiver is activated immediately for the time-period which had been previously configured
when enabling the low power mode, i.e. for a duration of 2 seconds
Within these 2 seconds the following command must be sent to disable the low power mode:
“AT^SPOW=1,0,0”
Disabling the low power mode upon receiving GSM activity
Call the number of the SIM card inserted in the modem, or send an SMS message
The RING line will change from Low to High level
Set the RTS Line on the DTE side from Low to High level