If you have verified that the communication parameters are correct and are still unable to establish communication over Unitelway or USB, make sure that the backplane has two terminators, terminator A on the left side next to the power supply and terminator B on the right side of the backplane.

If you have verified that the communication parameters are correct and are still unable to establish communication over Unitelway or USB, make sure that the backplane has two terminators, terminator A on the left side next to the power supply and terminator B on the right side of the backplane.