Westermo TR-23 - Handbuch (Seite 11)

11 6600-2002
ON
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ON
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Selection of 2/4 wire (line side)
4-wire S2
2-wire S2
Factory setting
Selection of 2/4 wire
(RS-422/485 side)
2-wire S3
4-wire S3
Filtering of DCD and RxD
Yes S3
No S3
Activity timer
Off S3
1 min S3
Termination of RS-422/485
Termination
2-wire (RS-485)
S3
Termination
4-wire (RS-422)
S3
Non termination S3
S3
The use of the timer is a fail safe to ensure that a faulty unit
connected to the modem will not block the line.
Relay connection
Activated S3
Non activated S3
When this function is activated the relay closes when data is
sent. If the function is not activated, the relay is always open.
If this is enabled, RxD is delayed (buffered) 6 ms in order
to avoid garbage characters when carrier is deactivated.
The turn around time for the modem from sending to
receiving on the line is 10 ms if this filter is enabled.
All RS-422/485 lines should be terminated at the end-points.
The RS-422/485 interface also has a fail-safe circuit which
forces a non-active line into idle state.
Carrier active using
RTS or incoming data
RTS S2
Incoming data S2
If the DTE uses the control signal- (RTS) the RTS signal is
used to activate the transmitter.
If the DTE does not control RTS or if RS-485 is used then
the transmitter is activated by incoming data. In this case the
data is buffered in the TD-23 while the carrier is established.
By setting RTS always active a permanent carrier will be
established. This is the typical setting for a full duplex
4-wire communication.
Permanent carrier S2
ON
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ON
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RTS – CTS delay,
23 or 60 ms
23 ms S2
60 ms S2
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ON
1 2
S1 S2
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ON
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ON
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ON
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ON
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ON
1 2 3 4 5 6 7 8 9
ON
1 2 3 4 5 6 7 8 9