Telit Wireless Solutions GM862-GPS - Manual (Page 22)

GM862-GPS Hardware User Guide
1vv0300728 Rev. 0 - 27/04/06
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved page 22 of 55
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: