Rainbow Electronics GE863-GPS low power - Manual (Page 79)

GE863-GPS Software User Guide
1vv0300724 Rev. 3 - 05/07/07
Reproduction forbidden w ithout Telit Communications S.p.A. w ritten authorization - All Rights Reserved page 79 of 122
3.6 Using General Purpose Input/Output pins
The Telit GE863-GPS provides various General Purpose Input/Output pins, these pins can be
configured via AT commands as Inputs, Outputs and some of them as "alternate function".
The "alternate function" are supported by 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 GE863-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:
1 – GPIO1 10 – GPIO10
2 – GPIO2 11 – GPIO11
3 – GPIO3 12 – GPIO12
4 – GPIO4 13 – GPIO13
5 – GPIO5 14 – GPIO14
6 – GPIO6 15 – GPIO15
7 – GPIO7 16 – GPIO16
8 – GPIO8 17 – GPIO17
9 – GPIO9 18 – GPIO18
<value> 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.