Epson RC90 User Manual page 215

(5) The [Device Manager] dialog appears.
NOTE When "EPSON Robot Controller RC170" is registered and located under "Universal

Serial Bus controllers" in step (5), the development PC and the Controller connect
properly.
If the following error message appears, please contact EPSON.
If "EPSON Robot Controller RC170" is not located under "Universal Serial Bus
controllers" but located under "Other devices" in step (5), refer to Maintenance 9.2.2
When recognized under "Other devices" in Windows Device Manager.
RC90 (EPSON RC+ 7.0) Rev.4
Click <Universal Serial Bus controllers> and make sure that "EPSON Robot
Controller RC170" is registered.
"Cannot connect to controller.
!! Error: 1805, Connection failure, check the controller startup and connection of the
communication cable."
Maintenance 9. Troubleshooting
199