BUS EXTENDER CIRCUITRY FOR DATA TRANSMISSION
 Inventors: David H. Guest, Balerno; Peter R.
Roubaud, Kirkliston, both of
 Assignee: Hewlett-Packard Limited, South
 Appl. No.: 498,038
 Filed: May 26, 1983
Related U.S. Application Data
 Continuation of Ser. No. 258,219, Apr. 27, 1981, abandoned.
 Foreign Application Priority Data
Apr. 30, 1980 [GB] United Kingdom 8014288
 Int. CI.3 G06F3/00
 U.S. CI 364/200; 364/900;
 Field of Search 364/200, 900;
340/825.21, 825.14, 825.07; 178/3, 4
 References Cited
U.S. PATENT DOCUMENTS
Re. 29,246 5/1977 Ricci 364/900
3,878,512 4/1975 Kobayashi et al 340/825.07
3,990,046 11/1976 Katz et al 340/825.07
4,064,360 12/1977 Koenig 178/3
4,156,796 5/1979 O'Neal et al 364/900
4,223,380 9/1980 Antonaccio et al 364/200
Guest, David H., "An HP-IB Extender for Distributed Instrument Systems," Hewlett-Packard Journal, Aug., 1979, pp. 26-32.
Primary Examiner—Gareth D. Shaw
Assistant Examiner—D. Rutherford
Attorney, Agent, or Firm—Douglas A. Kundrat
The present invention is related to bus extender circuitry for data transmission from a first bus at a first site to a second bus at a second site, includes a first transceiver at the first site, a second transceiver at the second site and a data and control signals transmission medium interconnecting both transceivers. The first transceiver receives data signals and interacts by means of control signals with the first bus which has data and control lines connected to a data source and possibly also to one or more receivers all located at the first site. The second transceiver receives data signals and interacts, by means of control signals, with the first transceiver to transmit data and control signals to the second bus; the second transceiver has data and control lines connected to one or more receivers at the second site.
12 Claims, 13 Drawing Figures