User's Manual

HE910 Hardware User Guide
1vv0300925 Rev.9 – 07-02-2012
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 56 of 80
An example of RS232 level adaptation circuitry could be done using a MAXIM
transceiver (MAX218)
In this case the chipset is capable to translate directly from 1.8V to the RS232 levels
(Example done on 4 signals only).
The RS232 serial port lines are usually connected to a DB9 connector with the following
layout: