Telit EZ10-GPRS/-PCS
Product Description
80269ST10014a, Rev. 3 – 26/09/05
Reproduction forbidden without written authorization by Telit Communications S.p.A.
Page 20 of 74
All Rights reserved – Right of modification reserved
2.5.6 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 GM862 module over a 100 Ohms
series resistor.
The following table shows the logic level specifications in the Telit EZ10 Modem terminal interface
circuits:
LEVEL
MIN
MAX
Input high level
2.1 V
3.6V
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 GM862 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).
2.5.7 RS232 standard interface connector
Connector type on the terminal:
•
RS-232 through D9-pin female
Baud rate from 300 to 115.200 bit/s
Autobauding (300 to 38.400 bit/s)
Short circuit (to Ground) protection on all outputs.
The EZ10 Terminal provides low-pass RF suppression circuits and level conversion to the GM862
Engine inside.
Input voltage range: -12V to +12V
Pin out (refers to DTE side):
Pin 1 = DCD Output
Pin 2 = RX Output
Pin 3 = TX Input
Pin 4 = DTR Input
Pin 5 = Ground
Pin 6 = DSR Output
Pin1
Pin5
Pin6
Pin9
