
Installation
7-9
TP 170A Equipment Manual
Release 12/99
Configure interface IF1B
The IF1B interface can be configured via the DIL switches on the rear side of the
unit. This interchanges the RTS signal for RS485 and the RS422 receive data. By
default, the RTS signal is not required by the communication peer.
The table shows the permissible DIL switch settings.
Communication
Switch Setting
PLC
RS422
Operating unit
ON
1
2
3
4
DP/MPI
Operating unit
ON
1
2
3
4
RTS on Pin 4 (default)
RTS on Pin 9 (same as
PU)
ON
1
2
3
4
PLC
No RTS on connector
1)
ON
1
2
3
4
PLC
MPI
Standard cable
Operating unit
ON
1
2
3
4
No RTS on connector
1)
1) State on delivery
Содержание SIMATIC HMI TP 170A
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