Chapter 3 ________________________________________________________________ Installation
JUMO __________________________________________________________________________ 53
RS-422/485 Interface
0503-029
Figure 33
RS-485 Module
The following numbers refer to Figure 33:
1
=
Flat cable pins
2
=
Selection switches
3
=
Screw terminals for wiring
Installation and Wiring
1.
Disconnect the power. In case the RS-485-module is installed in
the factory, continue with the item 4.
2.
Open the transmitter cover and attach the RS-485 module to the
bottom of the housing with four screws.
3.
Connect the flat cable between the RS-485 module and the
motherboard's pins
MODULE1 (Communications)
.
4.
Pull the network wirings through the cable gland.
5.
Connect the twisted pair wires (1 or 2 pairs) to the screw
terminals as presented in Table 4 unterhalb:
Table 4
Connecting the Twisted Pair Wires to the Screw
Terminals
Screw terminal
Data line
(2-wire RS-485)
Data line
(4-wire RS-485/422)
1
(not connected)
RxB
2
(not connected)
RxA
3
Data pair shield
Data pair shield
4
B
TxB
5
A
TxA
