User's Manual

LE940B6 Hardware User Guide
1VV0301331 Rev. 1.8 - 2017-03-15
Reproduction forbidden without written authorization by Telit Communications S.p.A. - All Rights Reserved
Telit Confidential Information, provided under NDA Page
75 of 104
As an example of RS232 level adaption circuitry could use a MAXIM transceiver (MAX218). In this
case, the chipset is capable of translating directly from 1.8V to the RS232 levels (Example on 4
signals only).
Figure 16: RS232 Level Adaption Circuitry Example
NOTE:
In this case, the length of the lines on the application must be taken into account to avoid
problems in the case of High-speed rates on RS232.
The RS232 serial port lines are usually connected to a DB9 connector as shown in Figure 17. Signal
names and directions are named and defined from the DTE point of view.
Figure 17: RS232 Serial Port Lines Connection Layout