Siemens Simatic S7-1500 Manual - Page 14

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Siemens Simatic S7-1500 Manual
Product overview

2.4 Properties of the RS422/485 interface

2.4
Properties of the RS422/485 interface
Definition
The RS422/485 (X27) interface is a differential voltage interface for serial data transmission.
Properties
The RS422/485 (X27) interface has the following properties and meets the following
requirements:
Type
Front connector:
RS422 signals:
RS485 signals:
Max. data transmission
rate:
Max. cable length:
Standard:
14
Differential voltage interface
15-pin sub-D female connector, with screw lock
T (A), R (A), T (B), R (B), GND; isolated
R/T (A), R/T (B), GND; all signals isolated against backplane bus and load
voltage
19.2 kbps
1200 m; cable type LIYCY 3 x 2 x 0.14. T(A)/T(B) and R(A)/R(B) twisted in
pairs
DIN 66259 Parts 1 and 3, EIA-RS422/485, CCITT V.11
CM PtP RS422/485 BA communication module (6ES7540‑1AB00‑0AA0)
Manual, 01/2013, A5E03777484-01