User Manual

GM862-GPS Software User Guide

1vv0300729 Rev. 5 - 05/07/07

3.6 Using General Purpose Input/Output pins

The Telit GM862-GPS 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-GPS

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=<pin>,<value>,1<cr>

where:

<pin> 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

<value> is the GPIO pin value that the pin will assume:

0 – LOW

1 – HIGH

• wait for response

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.