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124
A:
If your computer has an internal modem, make sure that the
communication port is not being used by it. In some cases, even
though no settings appear for the communication port, it cannot be
used. Check to see which port is being used by the modem.
■
How to check:for Windows XP
1
. Open the [Device Manager] following the steps outlined on P.
122
.
2
. Under [Modems] right click on [Communications cable between two
computers] then in the pop-up menu click on [Properties], in a short
time a new window will appear.
[Device Manager] Window (extract)
3
. By clicking on the [Modem] Tab, you can check which communication
port the modem is using.
Example of when Modem is
using Communication Port
(COM
1
)
A:
Sometimes communication will not work if an extension cable has
been added to the communication cable, or if a switch has been
added to the serial port (RS-
232
C).