Specifications

Configuring Modem Signals
11-18
Configuring DTR and DSR Signals
Introduction
This section describes how to configure DTR and DSR signals for those access
servers that do not support the other modem signals. DSR flow control must be
disabled when you are using the various port characteristics to control the DSR
and DTR signals. DSR flow control can override the port characteristics.
Port Characteristic Effects on the DTR and DSR Signals
The following table shows the enabled port characteristic effect on DTR and DSR
signals:
Enabled Characteristic DTR and DSR Actions
SIGNAL CONTROL DTR is deasserted for 5 seconds as a consequence
of a logout; otherwise, it is always asserted.
(SIGNAL CHECK and
DTRWAIT disabled)
Solicited remote connection is established
regardless of the state of DSR. Reception of
asynchronous data is accepted once the connection
is established.
Port is logged out if DSR is deasserted after initial
assertion.
DSRLOGOUT DTR is always asserted.
(SIGNAL CONTROL and
SIGNAL CHECK disabled
Solicited remote connection is accepted regardless
of the state of DSR.
Port is logged out if DSR is deasserted after initial
assertion.
Reception of asynchronous data is not be accepted
unless DSR is asserted.
SIGNAL CHECK DTR is always asserted.
(SIGNAL CONTROL disabled) Solicited remote connection will not be accepted
unless DSR is asserted.
Port is logged out if DSR is deasserted after initial
assertion.
Port status indicates “Signal Wait” if connections
cannot be accepted because DSR is deasserted.
DTRWAIT Has no affect unless SIGNAL CONTROL is
enabled.