Siemens Multi Panel MP270 SIMATIC HMI Equipment Manual page 100

Interface Assignment
IF2
Table B-3
5 1
9 6
B-2
Assignment of the 9-pin Sub-D plug (pin)
Pin
1
2
3
4
5
6
7
8
9
RS232
DCD
RxD
TxD
DTR
GND
DSR
RTS
CTS
RI
MP270 Equipment Manual
Release 01/99