G - Physics – 06 – F
Patent
G - Physics
06
F
354/233
G06F 9/22 (2006.01) G06F 13/42 (2006.01)
Patent
CA 1066812
APPARATUS FOR CONTROL AND DATA TRANSFER BETWEEN A SERIAL DATA TRANSMISSION MEDIUM AND A PLURALITY OF DEVICES Abstract of the Disclosure Apparatus under microprocessor control for use in communicating over a serial communication loop with a remote attached control unit. It is capable of establishing frame synchronization, interpreting commands, assembling data and transmitting bits on the loop. The apparatus also communicates with I/O devices over a demand/response interface. A microprocessor interface with the loop includes loop sync control which establishes bit synchronization and generates a restart pulse at bit receive time and bit send time. The execution of instructions by the micro- processor is stopped and the microprocessor enters a wait state when it has finished all previous work and is ready to receive a loop bit. When it is time to receive the loop bit the microprocessor is restarted in response to the restart pulse from the loop synchronization. or output operations to a device, the microprocessor loads the device address and a device command or data into shift registers and ini- tiates the transfer by setting a latch. When the transfer to the device is completed, this latch is reset in response to a signal from the device. - 1 -
252273
Cross Jon L.
Homan Merle E.
Machol Guenther K.
Malm Richard L.
Svelund Larry E.
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