Rack adapter for serially connected I/O interface racks

Details Rack adapter for serially connected I/O interface racks Rack adapter for serially connected I/O interface racks

1979-01-29

1981-03-03

Nusbaum, Mark E.

Boots, shoes, and leggings

364119, G06F 1546, G06F 1100, G06F 906

Patent

active

042544734

ABSTRACT:
A rack adapter for a programmable controller is included in each of four remotely located I/O interface racks that are connected in series to a central processor. The rack adapter includes a rack interface processor under program control which converts serial data received from the central processor to parallel data that is written into I/O modules in its rack. The rack interface processor also converts parallel data from I/O modules to serial data, which is sent back to the central processor through a select data out circuit in proper sequence with data from the other racks. The rack interface processor initiates the decontrol of machines connected to the four racks if a major transmission fault occurs, but the rack interface processor is tolerant to transmission errors caused by electrical noise. A dual-frequency clock drives the rack interface processor, and interface circuitry which is operable at two bit-transmission rates connects the rack interface processor to the communication channel, which can range up to 10,000 feet from the central processor.

REFERENCES:
patent: 3643223 (1975-02-01), Ruth et al.
patent: 3810105 (1974-05-01), England
patent: 3942158 (1976-03-01), Dummermuth
patent: 3997879 (1976-12-01), Markley et al.
patent: 4041473 (1977-08-01), Bardotti et al.
patent: 4047003 (1977-09-01), LaRocca et al.
patent: 4104731 (1978-08-01), Grudowski et al.
patent: 4118792 (1978-10-01), Struger et al.

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