Texas Instruments TI-83 Plus Manual Book page 15

Link Transmission Error
This error indicates that the TI™ Connect or TI-GRAPH LINK™
software is unable to communicate with the calculator. The
problem is usually associated with the TI-GRAPH LINK cable
and its connection to the calculator or to the computer.
•
Make sure the cable is firmly inserted in the calculator's link
port and the computer's serial or USB port.
•
Verify that the correct cable type is selected in the software
link settings.
•
Verify that the correct communications port (Com Port) is
selected in the software link settings. (This step does not
apply if you are using the USB port and TI Connect
software).
TI-83 Plus What Is My Angle? Application Page 15