Sierra Wireless AirLink FX100, Руководство пользователя

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4112221 Rev 7.2 June 19, 2013 33
User Guide Interfaces
5.1.1.1.2. Setting the GPIO as an Input
Refer to the following example for how to configure the GPIO as an input.

Enter the following commands:
 AT+WIOM=1,“GPIO21”,0 
this command activates GPIO21 as an input.
 AT+WIOR=“GPIO21” 
this command reads the GPIO21 level and
returns the value “1” which represents a HIGH level.

Pull the GPIO21 pin to GND, and read again. The return value should now be
“0” which
represents a LOW level.
Refer to documents [1] Open AT Application Framework AT Commands Interface Guide and [2]
AirPrime SL808xT and Q2698 Open AT Framework Commands Interface Guide for more information
regarding AT commands.
Note: The AT+WIOW and AT+WIOR commands will automatically set the GPIO to the desired mode. For
example, AT+WIOW=42,1 will set GPIO42 to output mode and in High state.
5.1.1.2. ON/OFF Pin
The FX Series 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 11. ON/OFF Pin Operation
Condition State Power Supply Operation
1 Open
When 4.75V to 32V supply is
applied.
The FX Series is turned ON.
2 Pulled to GND
When 4.75V to 32V supply is
applied.
The FX Series remains OFF.
3
Left open when turning
ON the FX Series,
then pulled to GND
4.75V to 32V supply is initially
applied.
The FX Series remains ON and will
remain ON until
AT+CPOF is sent to
turn the device OFF.
To enable the low power mode, the user may simply pull the ON/OFF pin to GND and send
AT+CPOF to the FX Series using a communication software such as a HyperTerminal.
Table 12. ON/OFF Pin Description
Pin # Signal I/O I/O Voltage Description
8 ON/OFF I 4V Pin to turn the FX Series ON/OFF.
Refer to the power consumption tables in section 11 Power Consumption for the power consumption
values when the FX Series is in Alarm mode (Low Power mode).