Testing Communications from MS-DOS (84279)
The information in this article applies to:
- Microsoft Windows 3.0
- Microsoft Windows 3.0a
- Microsoft Windows 3.1
- Microsoft Windows 3.11
This article was previously published under Q84279
3.00 3.00a 3.10 3.11
WINDOWS
kbtshoot kbtlc
SUMMARY
When you troubleshoot communications problems in Windows, an
MS-DOS-level communications program is often required to test the
modem and ports outside of Windows.
If an MS-DOS-based application cannot be used, it is possible to test
the modem connections by typing the following command at the MS-DOS
command prompt
where X is the number of the serial port the modem is connected to or
emulating.
The modem should respond with a dial-tone or just a communication signal.
MORE INFORMATION
The ATDT command is a signal to the modem that is interpreted as
Attention Dial Tone. The first command, Attention, signals to the
modem that it is about to receive information, and the Dial Tone
command instructs the modem to enable a line to dial out.
NOTE: The modem may not always give a dial tone with this test
procedure because a number does not follow the command; however, the
modem should give some kind of signal that information was received.
Modification Type: | Minor | Last Reviewed: | 7/7/2005 |
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Keywords: | KB84279 |
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