Bidirectional communication method

Details Bidirectional communication method Bidirectional communication method

1991-06-18

1994-01-11

Canney, Vincent P.

Excavating

371 206, 370 8515, G06F 1100

Patent

active

052788482

ABSTRACT:
Serial digital signals containing output information to be written in an input/output device and input information read from an input/output device are transmitted to a slave station and circulate successively through slave stations back to a master station. The output information is written into the slave stations in an output operation, and the input information is read from the input/output device in an input operation. Each of the input/output devices has its own address for selecting a device to be accessed in the output operation and/or the input operation. The serial digital signals are configured in a frame which is identical for the output operation and the input operation. The frame for the input operation with dummy information added to an input/output information block is transmitted from master station. An input/output information block supplied to the slave station is transmitted therefrom to a next slave station or the master station, while replacing the dummy information in the input/output information block with the input information read from the input/output device.

REFERENCES:
patent: 5163056 (1992-11-01), Hagiwara et al.
patent: 5170338 (1992-12-01), Moritoki et al.

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