Siemens SIMATIC HMI OP 77B Operating Instructions Manual page 12

2 Y H U Y L H Z
RS 232 (IF 1A)
5 1
9 6
Pin Assignment
1 DCD
2 RxD
3 TxD
4 DTR
5 GND
6 DSR
7 RTS
8 CTS
9 N. c.
Figure 1–7 RS 232 interface pin assignment
1
2
3
4
5
6
7
8
9
Figure 1–8 Pin switching
USB
1 4
Pin Assignment
1 DC +5 V, max. 100 mA
2 USB-DN
3 USB-DP
4 GND
Figure 1–9 USB standard connector pin assignment
1–6
Release 03/2004
Sub-D plug, 9-pin,
secured by screws
USB standard connector
Operating Instructions (Compact) OP 77B
6AV6691-1EA01-0AB0