Bus Failure Messages

Short-To-Battery

Either or both of the bus wires are shorted to the battery potential.

Short-To-5 Volts

Either or both of the bus wires are shorted to a 5-volt potential.

Short-To-Ground

Either or both of the bus wires are shorted to the ground.

BUS (+) & BUS (-) Shorted Together

The two bus wires are shorted together.

No Termination

The bus system has lost connection with all of its terminators.

Bus Bias Level Too Low

Either or both of the bus wire potentials are significantly below their normal 2.5 volts.

Bus Bias Level Too High

Either or both of the bus wire potentials are significantly above their normal 2.5 volts.

No BUS Bias

The bus system has lost connection with all modules that provide bias.

Bus (+) Open

The bus (+) wire has lost connection with termination and/or bias.

Bus (-) Open

The bus (-) wire has lost connection with termination and/or bias.

Not Receiving BUS Messages Correctly

The DRBIII(R) cannot communicate over the bus and does not know why.