Siemens SIMATIC HMI OP3 Equipment Manual page 91

Note
If you require the hardware test (refer to Section 16) to test the RS232 inter-
face, connect pins 3 and 4 to the 9-pin subminiature D connector of the serial
transfer cable.
The OP3 is connected to the RS232 interface of the PC by means of the cable
supplied. The configuration of the interconnecting cable is shown below.
Figure 15-3 Configuration of the Interconnecting Cable
MPI (RS485) The OP3 is connected to the SIMATIC S7 PLC through the MPI interface.
interface
The pin assignment of the MPI interface is shown in the following table.
1 5
6 9
The OP3 is connected to the MPI interface of the SIMATIC S7 PLC by
means of the cable supplied. The configuration of the interconnecting cable
is shown below.
Operator Panel OP3
Edition 11/99
OP3
TxD 4
RxD 3
GND 2
CTS 5
RTS 6
1
Pin Meaning
1 Code
2 M24V
3 RS485 line B
4 RTSAS
5 M5V
6 NC (not assigned)
7 P24V
8 RS485 line A
9 NC (not assigned)
Device Description
Cable PC
2 RxD
3 TxD
5 GND
7 RTS
8 CTS
4 DTR
6 DSR
1
9
NC
NC
15-3