B Connecting Cables; Rs 232C Interface Of The Cp 341-Rs 232C - Siemens Simatic S7-300 CP 341 User Manual

Connecting cables
B.1

RS 232C Interface of the CP 341-RS 232C

Pin assignment
The table below shows the pin assignment for the 9-pin sub D male connector in the front
panel of the CP 341-RS 232C (compatible with the 9-pin COM port (PC/programming
device).
Table B- 1 Pin assignment for the sub D male connector of the integrated interface of the CP 341-RS 232C
Male Connector Pin
on CP 341-
RS 232C
*
1
2
3
4
1
5
6
2
7
6
3
8
4 7
9
5
8
9
* 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 interfaces. GND
must always be connected on both sides (pin 5), otherwise the interface modules could be
destroyed.
On the following pages you will find examples of connecting cables for a point-to-point
connection between the CP 341-RS 232C and S7 modules or SIMATIC S5.
CP 341 Point-to-Point Communication, Installation and Parameter Assignment
Manual, 09/2008, A5E02191071-01
www.gkbpx.com
Designation
DCD1 Received Detector
RXD Received Data
TXD Transmitted Data
DTR Data Terminal Ready
GND Ground
DSR Data Set Ready
RTS Request To Send
CTS Clear To Send
RI Ring Indicator
Input/output Meaning
Input Received signal level
Input Receive data
Output Transmit data
Output Data terminal ready
- Functional ground (GND
Input Data set ready
Output Request to send
Input Clear to send
Input Incoming call
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