Electrical transmission or interconnection systems – Vehicle mounted systems – Automobile
Patent
1987-05-27
1988-10-11
Ro, Bentsu
Electrical transmission or interconnection systems
Vehicle mounted systems
Automobile
200263, 340537, G08B 108, H01H 104
Patent
active
047773782
ABSTRACT:
A manually operable electrical toggle switch (60) is connected in a low current signalling link (40) via a non-intelligent slave unit (20) in a time slot assignment multiplex system for automotive vehicles to an intelligent master unit (10) which in response to a binary input from the switch (60) provides an output signal on such a signalling link (40) to control high current to a load (70) connected to a slave unit (20). The switch (60) has conductive plastics contacts (63) to avoid oxide corrosion problems and may be all plastics. The binary input from the switch (60) is provided by one of two resistances (R2or R3) which are distinguishable in the master unit (10) from each other and from both a short circuit and an open circuit in the signal line (42) of the link (40). The condition of the switch (60) and its wiring (27) to the slave unit (20) may thus be diagnosed without manual operation of the switch as a programmable function of the master unit (10), via the master unit by a tester (80) or via the slave unit (20) by a tester (90) prior to assembly in the complete system.
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Ingenieurs de L'Automobile, No. 8, Nov. 1984, pp. 71-78, Paris, France, P.-J. Salvay, "Le Multiplexage Lucas".
GEC Review, vol. 2, No. 1, 1986, pp. 32-36, Chelmsford, Essex, GB, W. R. Betts, "Multiplexing for the Automotive Industry".
Ro Bentsu
Salplex Limited
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