Westermo MD-42 - Manual (Page 3)

9 6052-2001
Switch settings
The MD-42 can through different switch settings be adapted to a vareity of running
conditions. To set switches, open the plastic case by removing the top cover.
S2 Selection of signal activating the transmitter
Selection of signal controlling DCD
Selection of CTS delay
S3 Selection of termination with fail-safe 1)
Selection of 2- or 4-wire communication
Transmitter
Factory settings
Transmitter
Activated
by
RTS RTS RTS
RTS Always high
DTR DTR
DTR Always high
RTS
DTR
DTR
CTS
contolled
by
DCD
contolled
by
S2
S2
S2
S2
S3
ON
1 2 3 4 5 6
ON
1 2 3 4 5 6
ON
1 2 3 4 5 6
Termination (4-wire)
Termination (2-wire)
No termination
S3
S3
S3
ON
1 2 3 4 5 6
ON
1 2 3 4 5 6
ON
1 2 3 4 5 6
Termination
with fail-safe 1)
ON
1 2 3 4 5 6
Always high Always low Always active S2
ON
1 2 3 4 5 6
Always high Always high Always active S2
ON
1 2 3 4 5 6
ON
1 2 3 4 5 6
CTS-delay
0ms S2
S2
20ms S2
ON
1 2 3 4 5 6
ON
1 2 3 4 5 6
Selection of 2- or 4-wire
4-wire S3
2-wire S3
ON
1 2 3 4 5 6
ON
1 2 3 4 5 6
ON
1 2 3 4 5 6
1) The fail-safe function forces the
signal state of the receiver to
OFF when the connected
transmitter is in tri-state
(transmitter inactive).
The receiver located furthest
away shall be terminated.