Texas Instruments TI-83 Plus Manual Book page 48

Link Transmission Error
This error indicates that the TI GRAPH LINK™ software is
unable to communicate with the TI 83 Plus. The problem is
usually associated with the TI GRAPH LINK cable and its
connection to the TI 83 Plus and/or to the computer.
• Make sure the cable is firmly inserted in the calculator I/O
port and the computer.
• Verify that the correct cable type is selected in the
TI GRAPH LINK™ link settings.
• Verify that the correct communications port (Com Port) is
selected in the TI GRAPH LINK link settings.
If this does not correct the problem, try a different
TI GRAPH LINK cable and reboot your computer. If you continue
to get this error, please contact
assistance.
TI-83 Plus Polynomial Root Finder / Simultaneous Equation Solver Application
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Page 48