General purpose i/o, Rj11 (aux) connector, Gpio interface specification – Rainbow Electronics GT863-PY User Manual
Page 14: 7 general purpose i/o, 1 rj11 (aux) connector, 2 gpio interface specification
GT863-PY Terminal Product Description
80269ST10026a Rev. 0 - 27/09/06
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved
page 14 of 50
2.7 General Purpose I/O
2.7.1 RJ11 (AUX) connector
The signals on the RJ11 connector has 4 digital general purpose
inputs/outputs (GPIO). Connector type on the terminal is:
• Molex RJ11/6pin, part no.:95001-2661
The voltage range allowed on each pin is 0-3,6V DC. AUTO
POWER ON is enabled.
VMOD = direct connection to the pin of the power supply voltage
input of the Telit module (3.8V typical) and the output of the
internal switching voltage regulator. The presence of this line at
pin6 is to be considered as a low power output (<30mA) for pull-
up potential (requires external reduction of voltage to max. 3,6V
DC!).
NOTE: Connections to VMOD shall be made only when familiar
with designing circuits conform to EMC requirements.
All General Purpose input / output lines on the RJ11 GPIO interface have a 100 pF bypass
capacitor to ground and are connected to the related pins of the Telit module over a 100 Ohms
series resistor.
2.7.2 GPIO Interface Specification
Where not specifically stated, all the interface circuits work at 2.62V CMOS logic levels.
All General Purpose input / output lines on the RJ11 GPIO interface have a 100 pF bypass
capacitor to ground and are connected to the related pins of the Telit module over a 100 Ohms
series resistor.
The following table shows the logic level specifications in the Telit GT863-PY terminal interface
circuits:
pin Signal
I/O Function
Internal
Pull UP
Type
1
GND
-
Power Ground (negative)/ Signal Ground
POWER/GND
2
GPIO4
I/O Configurable general purpose I/O pin /
CMOS 2.8V
3
GPIO6 /
ALARM
I/O
Configurable general purpose I/O pin /
ALARM
CMOS 2.8V
4
GPIO7 /
BUZZER
I/O
Configurable general purpose I/O pin /
BUZZER
CMOS 2.8V
5
GPIO5
I/O Configurable general purpose I/O pin
CMOS 2.8V
6
VMOD
O Low power supply output (typically +3.8V DC)
POWER OUT
Pin 6
Pin 1
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