System manual CECX / Serial option module CECX-S-S4
CECX-II 32-7
32.5 Connections and wiring
32.5.1 Wiring and shielding
This section covers issues that concern in particular the serial interface
connections.
For all serial interfaces holds true:
z Use shielded cables
z Contact shield directly at metallic interface plug casing
Required cable (must be shiel-
ded in all cases)
Take account of line
termination
RS-422-A unidirec-
tional
twisted pair wiring with signal ground
(SGND)
yes
RS-422-A bidirecti-
onal
2x twisted pair wiring +
1 signal ground (SGND)
yes
RS-485-A
twisted pair wiring with signal ground
(SGND)
yes
verdrillte 2-Drahtleitung
Signalmasse
Schirm mit Schirmmass
Twisted 2-pair line
Signal ground
Shield with shield ground
Structure of a shielded twisted pair wiring with signal ground
32.5.2 Interface RS-485-A/RS-422-A
The CECX-S-S4 module can be configured via software on to the RS-422-
A or RS-485-A.
32.5.2.1 Connection example
The following connection examples show two possible configurations of the
serial option module CECX-S-S4.
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