CM PtP RS232 BA communication module (6ES7540-1AD00-0AA0)
Manual, 01/2013, A5E03777472-01
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Connecting
3
3.1 RS232 interface of the communications module
Terminal assignment
The table below shows the terminal assignment for the 9-pin sub D male connector in the
front panel of the communications module.
Table 3- 1 Terminal assignment for the sub D male connector of the integrated interface of the communications module
Male connector of the
communications module
Pin Designation Input/output Meaning
1 DCD Data Carrier Detect Input Received signal level
2 RXD Receive Data Input Receive data
3 TXD Transmit Data Output Transmit data
4 DTR Data Terminal Ready Output Data terminal ready
5 GND Ground - Functional ground
(isolated)
6 DSR Data Set Ready Input Data set ready
7 RTS Request To Send Output Request to send
8 CTS Clear To Send Input Clear to send
9 RI Ring Indicator Input Incoming call
* View from the front
Connecting cables
Standard connecting cables of various lengths (see chapter Accessories (Page 11)) are
available for connection with a communication partner which also has a 9-pin sub-D male
connector.
Please note that you must only use shielded connector casings and cables. A large surface
area of the cable shield must be in contact with the connector casing on both sides.
NOTICE
Never connect the cable shield with the GND, as this could destroy the interfaces. GND
must always be connected on both sides (pin 5), otherwise the modules could be
destroyed.
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