User guide

UC864-E/G/WD/WDU Hardware User Guide
1vv0300766a Rev.4
- 03/02/09
Reproduction forbidden without Telit Communications S.p.A’s. written authorization - All Rights Reserved. Page 43 of 78
Second solution could be done using a MAXIM transceiver (MAX218) In this case the
compliance with RS232 (+-5V) is possible.
Another level adapting method could be done using a standard RS232 Transceiver
(MAX3237EAI) adding some resistors to adapt the levels on the UC864 Input lines.
NOTE: In this case has to be taken in account the length of the lines on the
application to avoid problems in case of High-speed rates on RS232.
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 veiw