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DCD (Data Carrier Detect)
Option Values: follow, ignore
Applicable Data Protocols: All
This option determines whether the ADM turns on the Data Carrier Detect (DCD) lead when a
data call is in progress, and off when one is not (follow), or whether it keeps DCD on essentially
all the time (ignore).
If your data terminal transmits data only when the DCD lead is on, set DCD to ignore. When the
DCD lead is set to ignore, it appears to your terminal that a data call is always present, except for
one second following termination of a call. This enables your data terminal to transmit
commands to the ADM even when a data call is not present. This setting is appropriate for most
users.
Set the DCD lead to follow only if your application requires that DCD be off when a data call is
not present. Select follow also if your application will not enter data mode unless it sees the
DCD go from off to on.
See the instruction manual for your data terminal or PC application package to determine which
setting is appropriate.
DTR (Data Terminal Ready)
Option Values: follow, ignore
Applicable Data Protocols: All
Data Terminal Ready (DTR) lead is an electrical signal sent from your data terminal to the ADM.
The DTR option determines how the ADM responds to the presence or absence of this electrical
signal. The DTR lead is used by your data terminal to indicate to the ADM that it is ready for
communication. Many data terminals turn the DTR lead on whenever the data terminal is turned
on. If your data terminal works this way, setting the DTR option to follow enables you to end
data calls by turning off your data terminal. If you want to retain active data calls when your
data terminal is turned off or while you change EIA cables, set the DTR option to ignore.
If your application turns the DTR lead off during file transfer, set the DTR option to ignore.
Interactions with Answer: If the DTR option is set to follow and Answer is set to auto, the
ADM automatically answers data calls only when the DTR lead is on. If the DTR option is set
to ignore and Answer is set to auto, the ADM automatically answers whether the DTR lead is
on or off.
Data Options and Profiles
4-5
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