Siemens Simatic PG 740 Manual page 55

Switch Position Change the switch position as shown in Fig. 4-4:
Figure 4-4
Programming Device PG 740
C79000-G7076-C742-01
passive active
1
1
2
2
Switching the TTY Port to Actve / Passive with the S1 Switch
PG 740 Expansions
TTY-receive
TTY-send
Settings must not
be changed.
4-7
4