Connecting cables
B.3 X27 (RS 422/485) Interface of the CP 341-RS 422/485
CP 341 Point-to-Point Communication, Installation and Parameter Assignment
Manual, 09/2008, A5E02191071-01 235
B.3 X27 (RS 422/485) Interface of the CP 341-RS 422/485
Pin assignment
The table below shows the pin assignment for the 15-pin sub D females connector in the
front panel of the CP 341-RS 422/485.
Table B- 3 Pin assignment for the 15-pin sub D female connector of the integrated interface of the CP 341-RS 422/485
Female connector on
CP 341-RS 422/485
*
Pin Designation Input/output Meaning
1 - - -
2 T (A) - Output Send data (four-wire mode)
3 - - -
4 R (A)/T (A) - Input
Input/output
Receive data (four-wire mode)
Receive/send data (two-wire mode)
5 - - -
6 - - -
7 - - -
8 GND - Functional ground (isolated)
9 T (B) + Output Send data (four-wire mode)
10 - - -
11 R (B)/T (B) + Input
Input/output
Receive data (four-wire mode)
Receive/send data (two-wire mode)
12 - - -
13 - - -
14 - - -
15 - - -
* View from the front
Connecting cables
If you make your own connecting cables you must remember that unconnected inputs at the
communication partner may have to be connected to open-circuit potential.
Please note that you must only use shielded connector casings. A large surface area of both
sides of the cable shield must be in contact with the connector casing. You are advised to
use Siemens V42 254 shielded connector casings.
CAUTION
Never connect the cable shield with the GND, as this could destroy the interface modules.
GND must always be connected on both sides (pin 8), otherwise the interface modules
again be destroyed.
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