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CHAPTER 4: DEFINITIONS OF 7500 OPTIONS
The options used with 7500 asynchronous DCE, asynchronous DTE, and synchronous DCE are
defined in this chapter. In the tables "Front Panel" columns list options values that appear on the
7500. One of two Front Panel modes can be used: "Without Help" (which uses numbers) and With
"Help" (which uses words). "CMD" Mode values are used to set options from the keyboard of an
attached terminal.
For a complete description of the data protocols listed under each option, see the definition of
"Mode" later in this chapter.
Answer
Configurations: Asynchronous DCE
Data Protocols: X.25, Mode 2, Mode 3
Set Answer to auto if you want incoming data calls to be answered automatically. Select manual if
not. If you set Answer to manual, you can answer data calls manually if your 7500 is attached to an
asynchronous data terminal by typing y in response to the prompt [ ANSWER? ].
Without Help
Interactions with DTR: If the DTR option is set to follow and Answer is set to auto, then the 7500
checks to make sure that the DTR lead is on (usually indicating that your terminal is turned on) before
automatically answering the call. If you have set the DTR option to ignore and Answer to auto, the
7500 will answer data calls whether or not the DTR lead is turned on. If the DTR option is set to
follow and Answer is set to manual, the 7500 will not let you manually answer the call unless DTR is
on.
Attention
Configurations: Asynchronous DCE, Asynchronous DTE
Data Protocols: X.25, Mode 2, Mode 3
The Attention sequence is used to take the 7500 out of Data Mode and enables you to get the [ CMD: ]
prompt. The default setting is +++. You must always type the sequence rapidly (all three characters
within 1.5 seconds).
Before entering the Attention sequence, there must be—at least— a one second delay after typing
your last character. Then the three characters composing the sequence must be typed within 1.5
seconds. Finally, no additional characters should be typed for one second after typing the Attention
sequence. Failure to comply with these guidelines will result in the Attention sequence characters being
sent to the far-end as data.
Asynchronous DCE
Option Values For Answer
Front Panel
With Help
MANUAL
0
1
AUTO
CMD
Factory Value
Mode
DCE
manual
automatic
X
51
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