User's Manual

CE910-DUAL Hardware User Guide
1vv0301010 Rev .0 – 2012-07-10
Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights Reserved. Page 36 of 63
8. Serial Port
The serial ports on the Telit CE910-DUAL are the interface between the module and OEM
hardware.
At this moment 1 serial port is available on the module:
Modem Serial Port 1 (Main)
Several configurations can be designed for the serial port on the OEM hardware.
The most common are:
RS232 PC comport
Microcontroller UART@1.8V(Universal Asynchronous Receiver Transmit)
Microcontroller UART@5V or other voltages different from 1.8V
Depending on the type of serial port on the OEM hardware, a level translator circuit may be
needed to make the system work.
Serial port 1 is a +1.8V UART with all the 7 RS232 signals.
The electrical characteristics of the serial port are explained in the following tables:
Absolute Maximum Ratings -Not Functional
Parameter Min Max
Input level on non-power pin with respect to ground
-0.3 +2.3V
Operating Range - Interface levels
Parameter Min Max
Input high level
1.5V 2.1 V
Input low level
0V 0.35V
Output high level
1.35V 1.8V
Output low level
0V 0.45V
8.1. Modem Serial Port 1
Serial port 1 on the CE910-DUAL is a +1.8V UART with all 7 RS232 signals.