UniMod GSM-4
21
8.3
SMS Function
Optional it is possible to activate SMS. This function is monitoring of on/off
state changes of SMS input (terminals 8/GND and 9/UE), possible in CSD
mode and GPRS mode:
Interface RS232: Function DCD/DTR
SMS: Function UE/UA, Standard
U E
D T R
U A
D C D
U E
D T R
U A
D C D
Example: 20mA interface with two meters and SMS input (contact):
The modem tries to send an SMS at every change of contact (open/close).
Maximum rate is one SMS every 2 to 3 seconds.
Connect: If the connection (CSD mode) is active, the SMS will be send after a dis-
connect.
GPRS: If the GPRS mode is active, at the first change the modem to the CSD
mode: the SMS will be send after these change.
Note:
“SMS function” doesn’t work at the same time with “Automatic baud rate
adaption” (see page 22).
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In some cases it is neccessary to enable the SMS functionality at the
network provider. In order to test a SIM card it proved useful to insert
it into a mobile phone and then try to send a SMS.