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Reference Guide
3.1.1.2.
ON/OFF Pin
The modem has an external ON/OFF pin which is used to turn the device ON or OFF.
The following table describes the operation of this pin.
Table 6.
ON/OFF Pin Operation
Condition
State
1
Open
2
Pulled to GND
Left open when turning
3
ON the modem, then
pulled to GND
To enable the low power mode, the user may simply pull the ON/OFF pin to GND
and send AT+CPOF to the modem using a communication software such as a
HyperTerminal.
Table 7.
ON/OFF Pin Description
Pin #
Signal
8
ON/OFF
Refer to the power consumption tables in section 6 Power Consumption for the
power consumption values when the modem is in Alarm mode (Low Power mode).
3.1.2.
Serial Interface
A SUB-D 15-pin connector is available as a serial interface to directly communicate
with the modem. This serial interface is used for:
• RS232 serial link connection
• Audio lines connection (microphone and speaker)
• RESET signal connection
Figure 14.
15-Pin Serial Connector
Power Supply
When 4.75V to 32V supply is
applied.
When 4.75V to 32V supply is
applied.
4.75V to 32V supply is initially
applied.
I/O
I/O Voltage
I
4V
Rev 1.0
Operation
The modem is turned ON.
The modem remains OFF.
The modem remains ON and will
remain ON until AT+CPOF is sent to
turn the device OFF.
Description
Pin to turn the modem ON/OFF.
1/27/14
Interfaces
21
21
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