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Modem and Flow Control Operation
Dial-in to Remote Access Ports that Do Not Support RNG
Dial-out Modems
A-4
This is a nonstandard configuration for dial-in lines that do not support the
RNG modem control signal. The server asserts the DTR modem control signal
in response to the assertion of the DCD modem control signal. Dial-in to a port
configured as REMOTE ACCESS is useful for automated data collection. This
application has the following port settings:
Port Characteristic
DSRLOGOUT
DTRWAIT
MODEM CONTROL
ACCESS
The following list describes the sequence of signals for this application:
•
Server asserts DTR.
•
Server deasserts DTR if DCD is not asserted within 60 seconds of the
assertion of DTR.
•
Server permits data flow after the assertion of DCD.
•
Server performs the disconnect sequence if DCD is deasserted for more
than the period of time specified by the DCD TIMEOUT characteristic
(default is 2 seconds).
•
Server performs the disconnect sequence if the session is disrupted.
This configuration is the standard for dial-out lines. The server asserts the DTR
modem control signal in response to the formation of a session connection to
the service defined at the port.
enters as it observes or asserts various modem signals (in the diagram, circled
items indicate port states and arrows indicate activity). This application has the
following port settings:
Port Characteristic
DSRLOGOUT
DTRWAIT
MODEM CONTROL
ACCESS
Setting
DISABLED
ENABLED
ENABLED
REMOTE
Figure A-3
shows the modem states that the port
Setting
DISABLED
ENABLED or FORCONNECTION
ENABLED
REMOTE
893-826-A
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