User's Guide

UC864-E-AUTO / AWS-AUTO Hardware User Guide
1vv0300795 Rev.11 – 2010/11/18
Reproduction forbidden without Telit Communications S.p.A’s. written authorization - All Rights Reserved. Page 40 of 78
10. Serial Ports
Serial PortsSerial Ports
Serial Ports
The serial port on the Telit UC864-E-AUTO / AWS-AUTO is another possible interface
between the module and OEM hardware.
2 serial ports are available on the module:
• MODEM SERIAL PORT;
• MODEM SERIAL PORT 2 (DEBUG).
10.1. Modem Serial Port
Several configurations can be designed for the serial port on the OEM hardware. The
most common are:
• RS232 PC com port;
• microcontroller UART @ 2.6V – 2.9V (Universal Asynchronous Receive
Transmit) ;
• microcontroller UART @ 5V or other voltages different from 2.6V .
Depending on the type of serial port on the OEM hardware, a level translator circuit
may be needed to make the system work. The only configuration that does not need a
level translation is the 2.6V UART.
The serial port on UC864-E-AUTO / AWS-AUTO is a +2.6V UART with all the 7 RS232
signals. It differs from the PC-RS232 in signal polarity (RS232 is reversed) and levels.