Installation
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Note!
RS-485 Bus Termination
If the interface module is operated as the first or last physical device in an RS-485 bus, there
must be a bus termination on this module. To do this, set the "Rx 422 Termination" slide switch
to "Off" and the "Tx 422 Termination" slide switch to "On." This activates the RS-485 terminator
(150
) built into the interface module.
If you connect only one sensor to the interface module, you must always activate the RS-485
terminator; see also Cable routing in the RS-485 bus.
Note!
PROFIBUS Termination
If the interface module is located at the beginning or end of the data cable to the control panel,
there must be a bus termination at this interface module. To do this, set the "Termination"
(PROFIBUS) slide switch to "On." This activates the PROFIBUS terminator built into the
interface module.
More information about bus termination can be found in the general fieldbus literature.
*) RS485-
T
er
mina
tion:
Rx422 = off
T
x422 = on
1
2
3
4
5
6
7
Rx232
T
x232
AP
-GND
Rx422+
Rx422-
T
x422+
T
x422-
RS485+
RS485-
Rx422* Ter
mination
Tx422*
On Off On O
ff
X1
PR
O
F
IB
U
S
T
e
rmi
n
a
ti
o
n
Power/State
Bus
Power
1
2
4
8
S4
S5
State
Bus
State
Low
High
ID
Bus
o
n
o
f
f
VL
X-F
2
3
1
-B
6
Mo
d
u
l
ABCD
0
1
2 34
56
7
8
9
ABCD
0
1
2 34
56
7
8
9
ABCD
0
1
2 34
56
7
8
9
ABCD
0
1
2 34
56
7
8
9
