Siemens SIMATIC HMI TP 170A Equipment Manual page 51

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.
Operating unit
Operating unit
Operating unit
1) State on delivery
TP 170A Equipment Manual
Release 12/99
CuuDuongThanCong.com
Communication
RS422
PLC
DP/MPI
PLC
MPI
PLC
Standard cable
https://fb.com/tailieudientucntt
Installation
Switch Setting
4 3 2 1
ON
4 3 2 1
ON
RTS on Pin 4 (default)
4 3 2 1
ON
RTS on Pin 9 (same as
PU)
4 3 2 1
ON
1)
No RTS on connector
4 3 2 1
ON
1)
No RTS on connector
7-9