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Appendix A
Modem Control Signal Interaction
Dial-in Modems that Support RNG
893-826-A
Modem and Flow Control Operation
This chapter describes how modem control and flow control operate. You can
use this information for troubleshooting. This chapter includes information
about the following topics:
•
Modem control signal interaction
•
Flow control
The port characteristics that you must set to achieve the desired interaction
between hardware and software depends on your modem control application.
The following sections describe the interaction of hardware and software for
the following modem control applications:
•
Dial-in modems that support RNG
•
Dial-in modems that do not support RNG
•
Dial in to remote access ports that do not support RNG (automated data
collection applications)
•
Dial-in/dial-out modems that support RNG
•
Dial-in/dial-out modems that do not support RNG
This configuration is the standard for dial-in lines that support the RNG modem
control signal. The server asserts the DTR modem control signal in response to
the assertion of the RNG modem control signal.
states that 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
Figure A-1
Setting
DISABLED
FORRING
ENABLED
LOCAL
shows the modem
A-1
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