Siemens S5-135U/155U - Manual (Page 254)

5-114
System Manual
C79000-G8576-C199-06
When the submodule is delivered, the jumpers are set as shown in the
following figure. As a rule, therefore, you can use the RS 422 A/485
submodule immediately.
Front Connector
X4
X3
1 19
1 11
2 20
2 12
Figure 5-26 RS422-A/485 Submodule: Jumper Settings when Delivered
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.
Jumper Settings
on the
RS422 A/485
Submodule
CPUs, Memory Cards, Memory Submodules, Interface Submodules