Title: Apparatus for monitoring the operation of a data processing communication system

Abstract: A data processing system includes a data processing unit and a number of communication units for coupling a corresponding number of terminal devices for transmission and reception of signals over a number of communication lines. Apparatus checks the operation of the communication units and includes logic circuits which couple to the receiver and transmitter circuits of each unit, circuits for transmitting checking signals to the receiver circuits of the unit and circuits for receiving signals transmitted by the transmitter circuits of the units. Additionally, each of the logic circuits couples to the data processing unit and are arranged to be enabled in succession by the data processing unit for transmission and reception of the checking signals and response signals respectively while still allowing the units not being checked to operate normally.

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Inventors: Akriche, Jean (Margency, FR)
Molitor, Andre (La Varenne-St-Hilaire, FR)

Application Number: 468964
Filing Date: 1974-05-10
Publication_date: 1976-03-09
Assignee: Honeywell Information Systems Inc. (Waltham, MA)
Primary Class(es): 714/45
Other Classes:
US Patent Ref:

3409877	Nov, 1968	Alterman et al.	340/172.
3654603	Apr, 1972	Gunning et al.	340/146.
3692989	Sep, 1972	Kandiew	235/153.
3790769	Feb, 1974	Ziegler	235/153.
3794973	Feb, 1974	Huber et al.	235/153.
3818199	Jun, 1974	Grossmann et al.	235/153.
3838261	Sep, 1974	Rice et al.	235/153.
3842405	Oct, 1974	Key et al.	340/172.

Other Refs:
Primary Examiner: Atkinson, Charles E.
Assistant Examiner:
Attorney: Driscoll; Faith F., Reiling; Ronald T.