Honda Giken Kogyo Kabushiki Kaisha

Oki Electric Industry Co., Ltd.

Harutada Ohya

Kazuo Nakamura

Katsutoshi Tagami

Yoshikazu Tsuchiya

Hayato Muneyuki

Yoshio Mase

Rumiko Akimoto

Masaru Nishijimi

A multiplex transmission system (100) in which any (N.sub.i) of a plurality of nodes (N.sub.l -N.sub.n) connected loop-like with a signal transmission path (1a, 1b) and each respectively connected to, for controlling, one of a plurality of electrical equipments is adapted for transmitting, in a given order (i) and in accordance with a time base (1/2t.sub.1) that this node (N.sub.i) itself has, a prepared signal (A.sub.i, D) to the signal transmission path (1a, 1b) and for receiving prepared signal (A.sub.i, D; A.sub.x, D) from the signal transmission path (1a, 1b), wherein any (N.sub.i) of the nodes (N.sub.l -N.sub.n) is adapted, at a time point (r.sub.2, r.sub.3) where this node (N.sub.i) has received the prepared signal (A.sub.x, D) from any other node (N.sub.x) to have its own time base (1/2t.sub.1) synchronized with the time base (1/2t.sub.1) of the other node (N.sub.x). Any (N.sub.i) of the nodes (N.sub.l -N.sub.n) further comprises a monitoring timer (CNT.sub.2) adapted to have a monitoring time interval (t.sub.2, t.sub.i3, t.sub.i4) set thereon at a predetermined time point (59, 62, 71, 84, 88), and is adapted to rise for transmitting the prepared signal (A.sub.i, D) thereof to the signal transmission path (1a, 1b) when the monitoring timer (CNT.sub.2) has timed up.

Multiplex transmission system

A multiplex transmission system (100) in which any (N.sub.i) of a plurality of nodes (N.sub.1 -N.sub.n) connected loop-like with a bidirectional signal transmission path (1a, 1b) and each respectively connected to control one of a plurality of units of electrical equipment is adapted for transmitting, in a given order (i), a prepared signal (A.sub.i, D) to the signal transmission path (1a, 1b) and for receiving a prepared signal (A.sub.i, D; A.sub.x, D) from the signal transmission path (1a, 1b), wherein any (N.sub.i) of the nodes (N.sub.1 -N.sub.n) has a rise-timing timer (CNT.sub.2), on which a rise-timing time interval (t.sub.i3, t.sub.i4) of a length proper to this node (N.sub.i) is set at a predetermined time point (54, 62, 71, 84, 88), and is adapted for rising to start signal transmission when the rise-timing timer (CNT.sub.2) has timed out. The signal transmission path (1a, 1b) includes a pair of signal transmission lines (1a, 1b), and any (N.sub.i) of the nodes (N.sub.1 -N.sub.n) is adapted, when this node (N.sub.i) is at the order of signal transmission of its own, for transmitting the prepared signal (A.sub.i, D) to the signal transmission lines (1a, 1b) and receiving the prepared signal (A.sub.i, D; A.sub.x, D) from one (1a) of the signal transmission lines (1a, 1b) and for checking the signal (A.sub.i ', D') as thus received with the signal (A.sub.i, D) as transmitted, to thereby diagnose for abnormality of the aforesaid one (1a) of the signal transmission lines (1a, 1b).

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Tokyo, Japan

Harutada Ohya