(19)
(11) EP 0 929 057 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
17.04.2002 Bulletin 2002/16

(43) Date of publication A2:
14.07.1999 Bulletin 1999/28

(21) Application number: 99300129.6

(22) Date of filing: 08.01.1999
(51) International Patent Classification (IPC)7: G08B 26/00, H04L 29/12, H04L 12/28
(84) Designated Contracting States:
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
Designated Extension States:
AL LT LV MK RO SI

(30) Priority: 13.01.1998 JP 1808798

(71) Applicant: NITTAN COMPANY, LIMITED
Tokyo (JP)

(72) Inventors:
  • Sandell, Kenth
    413 22 Goteborg (SE)
  • Stakkestad, Christer
    415 06 Goteborg (SE)
  • Kimura, Tetsuo
    Tokyo (JP)

(74) Representative: Price, Paul Anthony King et al
D. Young & Co., 21 New Fetter Lane
London EC4A 1DA
London EC4A 1DA (GB)

   


(54) Control system and transmission method


(57) In the control system, the units each have inherent ID information allocated thereto and the transmission message includes at least address information of an addressee and an operation code. The operation code is calculated in consideration of at least ID information of the addressee. For example, the operation code is calculated in the form of a checksum of at least said address information of said addressee and said ID information of said addressee. Such a control system is capable of significantly enhancing security in exchange of information, when it is carried out between units using a transmission message.






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