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A master/slave control system and method of communicating messages between a master controller and slave devices, especially for use in a vehicle. The system includes a data communication bus, a plurality of slave devices coupled to the data communication bus which are addressable and capable of rea

A master/slave control system and method of communicating messages between a master controller and slave devices, especially for use in a vehicle. The system includes a data communication bus, a plurality of slave devices coupled to the data communication bus which are addressable and capable of reading messages broadcast on the data communication bus and broadcasting reply messages to the data communication bus, and a master controller coupled to the data communication bus for broadcasting command messages. The command messages include an address for addressing at least one of the plurality of slave devices and a direction indicator parity bit for identifying the command message. The addressed slave device produces a reply message which includes a reply direction indicating parity bit for identifying the reply message.

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1. A master/slave control system comprising:a data communication bus for communicating data messages between electronic devices; a plurality of slave devices coupled in data communication to said data communication bus, said plurality of slave devices being addressable and capable of reading message

1. A master/slave control system comprising:a data communication bus for communicating data messages between electronic devices; a plurality of slave devices coupled in data communication to said data communication bus, said plurality of slave devices being addressable and capable of reading messages from said data communication bus and writing messages to the data communication bus; and a master controller coupled in data communication to said data communication bus for broadcasting command messages on said data communication bus, wherein said command messages include an address message for addressing at least one of said plurality of slave devices and a command direction indicator parity bit for identifying the command message, wherein said addressed slave device produces a reply message which includes a reply direction indicator parity bit for identifying the reply message.