Audiotel BASE Manual Del Usuario página 37

GSM/GPRS INDUSTRIAL MODEM
Power IN
IGN/DTR
Serial port
Power Down
Hardware switching off (in case of emergency only)
The Power Down signal (PDN) have to be kept in a high level (IGN/DTR signal have
to be kept in a low level) for at least 3,5sec (see the timing diagram below).
Power IN
IGN/DTR
Power Down
AT^SMSO OK
Min 3,5sec
Modem
off
Modem
off
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