Okura Yusoki A Series Manual page 58

Check on [OXPA-usage condition setting] screen
3. Make sure if communication condition setting is same as in controller.
Make sure if USB cable is securely connected between PC and robot.
Make sure if COM port is correctly setup.
Make sure if, in system parameter setting, baud rate of OXPA-QmV / PLCV is set to
38400 bps, stop bit to 8, and parity bit to none.
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