Description Of Interfaces - Siemens SIMATIC HMI OP 77B Operating Instructions Manual

5 H O H D V H       

1.5 Description of Interfaces

Power supply
1 2
Pin Assignment
1 +24 V DC
2 GND
Figure 1–5 Pin assignment for power supply
RS 422/RS 485 (IF 1B)
5 1
9 6
Pin Assignment with
RS 422
1 N. c.
2 M
3 TxD+
4 RxD+
5 GND, potential-free
6 DC +5 V, potential-free
7 DC 24 V in
8 TxD-
9 RxD-
Figure 1–6 RS 422 and RS 485 interface pin assignments
Operating Instructions (Compact) OP 77B
6AV6691-1EA01-0AB0
Plug connector, 2-pin
Sub-D socket, 9-pin,
secured by screws
Assignment with
RS 485
N. c.
M
LTG-B
RTS-AS
GND, potential-free
DC +5 V, potential-free
DC 24 V in
LTG-A
RTS-AS
2 Y H U Y L H Z
1–5