Rainbow Electronics GM862-QUAD-PY - Manual (Page 76)

GM862-QUAD / PY Software User Guide
1vv0300747 Rev. 3 - 10/07/07
Reproduction forbidden w ithout Telit Communications S.p.A. w ritten authorization - All Rights Reserved page 76 of 96
3.6 Using General Purpose Input/Output pins
The Telit GM862-QUAD / PY provides various General Purpose Input/Output pins, these pins can be
configured via AT commands as Inputs, Outputs and two of them as "alternate function".
The "alternate function" are supported by pins pins GPIO4 which can be configured as RF
Transmission Control input pin, GPIO5, which can be configured to become a RF Transmission
monitor output pin that reflects the RF transmission activation, GPIO6, which can be configured to
become an alarm output pin that reflects the alarm status, and GPIO7 which can be configured to
become a buzzer output pin.
With these pins your application can control external hardware directly using the
Telit GM862-QUAD /
PY pins, with little or even no hardware added.
3.6.1 GPIO pin setup
Before using the GPIO pin, you must configure them to select their direction or alternate function
3.6.1.1 Setting GPIO pin as OUTPUT
When you set a GPIO as output, you must specify also the value that the pin output must take:
•
Send command AT#GPIO=,,1
where:
is the GPIO pin number at which the command applies:
7 – GPIO7
2 – GPIO2 8 – GPIO8
3 – GPIO3 9 – GPIO9
4 – GPIO4 10 – GPIO10
5 – GPIO5 11 – GPIO11
6 – GPIO6 12 – GPIO12
13 – GPIO13
is the GPIO pin value that the pin will assume:
0 – LOW
1 – HIGH
•
wait for response OK
NOTE: The #GPIO setting is not saved and will be lost on power off, so at start-up repeat pin
initialization commands. At start-up the setting for GPIO4, GPIO5, GPIO6 and GPIO7 instead is
maintained even after a shutdown to permit the Alternate feature to work always.