Siemens S5-135U/155U System Manual page 254

CPUs, Memory Cards, Memory Submodules, Interface Submodules
Jumper Settings
When the submodule is delivered, the jumpers are set as shown in the
on the
following figure. As a rule, therefore, you can use the RS 422 A/485
RS422 A/485 submodule immediately.
Submodule
Figure 5-26
With the jumpers on the switch row X3 you can remove the preset for
recognizing a break state from the two-wire line R.
When delivered, the two-wire line R is preset with the jumpers 12-14 and 4-6
so that the break state can be recognized. Pin 4 (R(A)) of the front connector
lies above a resistance on +5 V. Pin 11 (R(B)) of the front connector lies
above a resistance on ground.
If you replug the jumpers on 10-12 and 6-8, the two-wire line R is preset as
follows: pin 4 (R(A)) of the front connector lies above a resistance on
ground. Pin 11 (R(B)) of the front connector lies above a resistance on +5 V.
The break state cannot be recognized.
5-114
Front Connector
19
20
11 1
X4
12 2
RS422-A/485 Submodule: Jumper Settings when Delivered
1
X3
2
System Manual
C79000-G8576-C199-06