User's Guide

HE863 Family Hardware User Guide
1vv0300891 Rev.5
- 2011-03-18
Reproduction forbidden without Telit Communications S.p.A’s. written authorization - All Rights
Reserved. Page 64 of 89
An example of level translation circuitry of this kind is:
The RS232 serial port lines are usually connected to a DB9
connector with the following layout: signal names and
directions are named and defined from the DTE point of view.