2
0
2
0
-0
3
28
Appendix
6
Appendix
6.1
Cable routing in the RS-485 bus
The data cables must always form an in-line connection between the first and the last node.
This in-line connection must end with a terminator.
The RS-485 terminators are integrated in the WCS readers and can be switched on and off
with the interface module.
If only
one WCS reader
is connected, one device is connected at the beginning and one
device is connected at the end of the data line.
Figure 6.1
Connection of
one
reading head
If
two WCS readers
are connected to one interface module, there are two wiring versions:
•
Version A:
One WCS reader is located at the beginning and one WCS reader at the end of the data
line. For both WCS readers, the RS-485 terminator is activated. The interface module is
located between these two readers and does not have an RS-485 terminator. Each WCS
reader is connected to the interface module by a separate data cable.
Reading head
Interface or control
(PLC)
