[54] BIDIRECTIONAL REMOTE CONTROL
SYSTEM USING INTERRUPT ARBITRATION
[75] Inventor: Toshio Enomoto, Tokyo, Japan
[73] Assignee: NEC Corporation, Tokyo, Japan
[21] Appl. No.: 08/917,277
[22] Filed: Aug. 25, 1997
[30] Foreign Application Priority Data
Aug. 23, 1996 [JP] Japan 8-222388
[51] Int. CI. I HUB 10/24
[52] U.S. CI 340/825.69; 340/825.57;
340/825.25; 341/176; 375/239; 359/146;
455/151.2; 348/734; 370/213
[58] Field of Search 340/825.69, 825.62,
340/825.58, 825.59, 825.57, 825.25; 341/176, 173; 375/239; 359/146, 142; 455/151.1, 151.2; 348/734; 332/106, 112; 370/213;
1/1
[56] References Cited
U.S. PATENT DOCUMENTS
4,914,428 4/1990 Kobayashi et al 340/825.62
5,043,723 8/1991 Araki et al 340/825.69
5,182,551 1/1993 Goto 340/825.69 X
5,532,684 7/1996 Katsu 340/825.25
5,579,496 11/1996 Van Steenburgge 348/734 X
5,699,065 12/1997 Murray 341/176
5,850,189 12/1998 Sakanaka et al 340/825.62 X
5,877,702 3/1999 Kohler 340/825.69 X
Masaaki, Patent Abstracts of Japan, vol. 013, No. 230, 1989 -01 036290 A, Feb. 1989.
Primary Examiner—Michael Horabik
Assistant Examiner—-William H. Wilson, Jr.
Attorney, Agent, or Firm—Foley & Lardner
[57] ABSTRACT
A data format is formed by a start code, an identification code and its inverted code, a first data code and a second data code, each of these codes being a single byte code, which is then followed by an interrupt arbitration period. Thus, when compared with a prior art data format, an inverted data code and an stop code of the prior art one are replaced respectively by the second data code and the interrupt arbitration period TI to realize upper compatibility. A remote controller transmitting a signal transmits an acknowledge code or a non-acknowledge code within the interrupt arbitration period depending on the interrupt code it receives after its current signal transmitting operation is temporarily switched to a signal receiving operation within the interrupt arbitration period.
6 Claims, 14 Drawing Sheets
