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DTR (Data Terminal Ready)
Configurations: Asynchronous DCE, Synchronous DCE
Data Protocols: X.25, Mode 2, Mode 3
Data Terminal Ready (DTR lead) is an electrical signal sent from your data terminal to the 7500.
The DTR option determines how the 7500 will respond to the presence or absence of this electrical
signal. The DTR lead is used by your data terminal to indicate to the 7500 that it is ready for
communications. 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 data terminal 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 7500 will
automatically answer data calls only when the DTR lead is on. If the DTR option is set to ignore and
Answer is set to auto, the 7500 will automatically answer whether the DTR lead is turned on or off.
Asynchronous DCE and Asynchronous DTE
Option Values For DCD
Front Panel
With Help
Without Help
0
IGNORE
1
FOLLOW
Asynchronous DCE
Option Values For DTR
Front Panel
Without Help
With Help
IGNORE
0
FOLLOW
1
Synchronous DCE
Option Values For DTR
Front Panel
Without Help
With Help
0
IGNORE
1
FOLLOW
CHAPTER 4: DEFINITIONS OF 7500 OPTIONS
Factory Value
CMD
Mode
DTE
DCE
X
X
ignore
follow
Factory Value
CMD
Mode
DCE
X
ignore
follow
Factory Value
CMD
Mode
DCE
X
57
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