Telit Communications S.p.A. GE864Q2B ユーザーズマニュアル
GE864
GE864
GE864
GE864----QUAD V2 / GE864
QUAD V2 / GE864
QUAD V2 / GE864
QUAD V2 / GE864----DUAL V2 Hardware User Guide
DUAL V2 Hardware User Guide
DUAL V2 Hardware User Guide
DUAL V2 Hardware User Guide
1vv0300875 Rev.1 – 2010-03-29
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved.
Page 41 of 73
The RS232 serial port lines are usually connected to a DB9 connector with the
following layout:
following layout:
9.3.
5V UART Level Translation
If the OEM application uses a microcontroller with a serial port (UART) that works at
a voltage different from 2.8
a voltage different from 2.8
–
3V, then a circuitry has to be provided to adapt the
different levels of the two set of signals. As for the RS232 translation there are a
multitude of single chip translators. For example a possible translator circuit for a 5V
TRANSMITTER/RECEIVER can be:
multitude of single chip translators. For example a possible translator circuit for a 5V
TRANSMITTER/RECEIVER can be: