X27 (Rs 422/485) Interface Of The Cp 341-Rs 422/485 - Siemens Simatic S7-300 CP 341 User Manual

Product Description
1.4 Properties of the Serial Interface
1.4.3

X27 (RS 422/485) Interface of the CP 341-RS 422/485

Definition
The X27 (RS 422/485) interface is a differential voltage interface for serial data transmission
in compliance with the X27 standard.
Properties
The X27 (RS 422/485) interface has the following properties and meets following
requirements:
Type:
Front connector:
RS 422 signals:
RS 485 signals:
Max. baud rate:
Max. cable length:
Standard:
Note
With the RK 512 and 3964(R) protocols, the X27 (RS 422/485) interface module can only be
used in four-wire mode.
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Differential voltage interface
15-pin sub-D female, with screwed interlock
TXD (A), RXD (A), TXD (B), RXD (B), GND; all isolated against the
S7-internal power supply
R/T (A), R/T (B), GND; all isolated against the S7-internal power supply
(S7-300 backplane bus) and the external 24 V DC supply
115.2 kbaud
250 m at 115.2 kbaud 500 m at 38.4 kbaud 1200 m at 19.2 kbaud; cable
type LIYCY 7 x 0.14 (6ES7902-3Ax00-0AA0)
DIN 66259 Parts 1 and 3, EIA-RS 422/485, CCITT V.11
CP 341 Point-to-Point Communication, Installation and Parameter Assignment
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Manual, 09/2008, A5E02191071-01