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 ground
- Bus (+) & Bus (-) Shorted Together - The two bus wires are shorted together.
- No Termination - The bus system has lost connection with its terminator.
- 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 the VTSS module which provides 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 DRB cannot communicate over the bus and does not know why.