Owner`s manual

41
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If RTS/DSR pass through is enabled for a local terminal port on the
Telplex, the state of the RTS input line for this port will be reflected on
the DSR output line of the designated remote terminal port.
As an example, refer to Figure 1 on page 2. Suppose RTS/DSR pass
through for terminal Port 1 on both units is enabled. If Port 1 of Unit 1
receives a false condition (negative voltage) on the RTS line, Unit 1
will signal Unit 2 to make the DSR line of Port 1 false.
If RTS/DSR pass through is disabled for a Telplex terminal port, the
DSR line for that port will remain a constant +12 VDC while power is
applied and the RTS input line will be ignored.
The factory default RTS/DSR pass through setting is disabled for
all terminal ports.
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The Telplex permits XON/XOFF to be enabled or disabled by port
independently, in the receive data (RX) and transmit data (TX)
directions. The description of handshaking assumes XON/XOFF to
be enabled in both directions. If XON/XOFF is disabled in one
direction, that direction will support hardware handshaking.
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When information is received by a Telplex terminal port, the data is
stored in a receive buffer and subsequently transmitted to the remote
unit through a composite port. If the receive buffer fills, the Telplex
will send an XOFF character signaling the terminal device that it
cannot accept more data. When the buffer empties to where it can
accept more characters, the Telplex will send an XON character.