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The Trilogy does not seem to be communicating with the computer. What can I do?
There are several things you can check to troubleshoot communication problems.
•    Make sure no other programs are using the serial port that the Trilogy is connected to.
•    Using a terminal program such as HyperTerminal open a new file and configure the settings for 9600, 8, none and 1.  The flow control should be set to none.  Save this file.

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After you have completed this make a measurement and the data should be displayed in the terminal program window.
•    Also check that you are using the appropriate cable and that both ends are connected.  If you are using a newer computer that only has a USB port make sure that your USB to serial adapter has the proper drivers installed and operating.  You can refer to the Trilogy Cable Guide for recommendations of a serial adaptor.