Product Description
1.4 Properties of the serial interface
PtP coupling and configuration of CP 340
Manual, 04/2011, A5E00369892-03
21
1.4.3 X27 (RS 422/485) Interface of the CP 340–RS 422/485
Definition
The X27 (RS 422/485) interface is a voltage-difference interface for serial data transmission
in compliance with the X27 standard.
Properties
The X27 (RS 422/485) interface has the following properties and fulfills the following
requirements:
Type: Differential voltage interface
Front connector: 15-pin sub-D female, with screwed interlock
RS 422 Signals: T (A)-, R (A)-, T (B)+, R (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
Max. baud rate: 19.2 kbps (3964(R) procedure)
9.6 kbps (ASCII driver, printer driver)
Max. cable length: 1,200 m, cable type LIYCY 7 0.14
Standard: DIN 66259 Parts 1 and 3, EIA-RS 422/485, CCITT V.11
Degree of protection: IP 00
Note
The X27 (RS 422/485) interface can only be run in 4-wire mode with the 3964 procedure.
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