Product Description
1.4 Properties of the Serial Interface
CP 341 Point-to-Point Communication, Installation and Parameter Assignment
26 Manual, 09/2008, A5E02191071-01
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: Differential voltage interface
Front connector: 15-pin sub-D female, with screwed interlock
RS 422 signals: TXD (A), RXD (A), TXD (B), RXD (B), GND; all isolated against the
S7-internal power supply
RS 485 signals: 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
Max. baud rate: 115.2 kbaud
Max. cable length: 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)
Standard: DIN 66259 Parts 1 and 3, EIA-RS 422/485, CCITT V.11
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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