GT863-PY Terminal Product Description
80269ST10026a Rev. 2 - 18/03/08
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 16 of 51
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:
LEVEL MIN MAX
Input high level 2.1 V 3.6V/3.3V
Input low level 0 V 0.5 V
Output high level 2.2 V 3.0 V
Output low level 0 V 0.35 V
See the GT863-PY HW and SW User Guides for
• Examples how to use the GPIO, e.g. setting over the air, sensing (polling) over the air or
locally by the DTE,
• Configuration as ALARM output or BUZZER,
• Example input circuit (e.g. to detect a 12-V signal or a passive contact),
• Example output circuit (e.g. to drive a Relay in 12-V-environment or to connect a LED).
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