Westermo MA-49 - Manual (Page 3)

9 6049-2001
Selection of signal
activating
CTS
delay
Switch settings
The MA-49 can through different switch settings be adapted to a variety
of running conditions.
ON
OFF
ON
OFF
S3
1 – 6
1 – 6
S2
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
S2 RTS RTS RTS
Transmitter
activated by
CTS
controlled
by
DCD
controlled
by
ON
1 2 3 4 5 6
S2 RTS RTS
Always
high
ON
1 2 3 4 5 6
S2 DTR DTR DTR
ON
1 2 3 4 5 6
S2 DTR DTR
Always
high
ON
1 2 3 4 5 6
S2
Always
active
Always
high
Always
high
ON
1 2 3 4 5 6
S2
Always
active
Always
high
Always
high
ON
1 2 3 4 5 6
S2 0ms
ON
1 2 3 4 5 6
S2 20ms
ON
1 2 3 4 5 6
Factory settings
S2
ON
1 2 3 4 5 6
S3
ON
1 2 3 4 5 6
Termination
with fail-safe 1)
S3
Receiver
termination (4-wire) ON
1 2 3 4 5 6
S3
Transmitter/Receiver
termination (2-wire) ON
1 2 3 4 5 6
S3 No termination
ON
1 2 3 4 5 6
Selection of 2-/4-wire
S3 4-wire
ON
1 2 3 4 5 6
S3 2-wire
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 loca-
ted furthest away shall be terminated.