Allen-Bradley Rockwell Automation 857 User Manual page 237

1 2 1 2
S1
S2
REM RX REM TX
Figure 9.6 – TTL− Module's dip-switches
1 2
1 2
S1
S2
Figure 9.7 – TCP− Module's dip-switches ( LOCAL for
Communication Option 2; REMOTE for Communication Option 1)
S1 S2
Figure 9.8 – 485-2− Module's dip-switches
S2
S1
Figure 9.9 – 485-4− Module's dip-switches
Connections
S1
Open Open
TTL
Close Close
S1
Open
RS-232
Close
S1
Open Open
REMOTE
Close Close
S1
Open
LOCAL
Close
EXT. I/O Termination OFF
S1
ON
1 2 3 4 5 6
OFF
REMOTE
Termination ON
S1
ON
1 2 3 4 5 6
OFF
LOCAL
S1
ON
1 2 3 4 5 6
OFF
EXT. I/O Termination ON, 4-wire
S2
OFF
1 2 3 4 5 6 1
ON
REMOTE
Termination OFF, 4-wire
S2
OFF
1 2 3 4 5 6
1
ON
Termination OFF, 2-wire
LOCAL
S2
OFF
1
1 2 3 4 5 6
ON
VCM 485-4
857-UM001A-EN-P – July 2009
9-9
S2
Open Open
Close Close
S2
Open
Close
VCM TTL
S2
Open Open
Close Close
S2
Open
Close
VCM TCP
S2
ON
OFF
S2
ON
OFF
S2
ON
OFF
VCM 485-2
S1
2 3 4
S1
2 3 4
S1
2 3 4