Hardware Manual

The serial ports on the Telit HE910 V2 are the interface between the module and OEM

hardware.

2 serial ports are available on the module:

 Modem Serial Port 1 (Main)

 Modem Serial Port 2 (Auxiliary)

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.

Serial port 2 is a +1.8V Auxiliary UART.

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

-0.3V

0.35V

Output high level

1.35V

1.8V

Output low level

0.45V