(57) A monitoring device for multiplex transmitters preferably used for composed vehicles
accurately monitors abnormal condition of slave devices regardless of erroneous multiplex
data communication between a master device (101) and the slave devices (102,103).
The monitoring device according to the present invention comprising: a master device;
a plurality of slave devices multiply communicated with the master device; control
means (8,9) connected to the plurality of slave devices each, the controlled means
(7) controlled by command signals from the master device; master memory (4) provided
to the master device for sequentially storing the command signals transmitted to the
plurality of slave devices and state signals indicating condition of the controlled
means of the slave device each; slave memories (11a) each provided to the plurality
of slave devices each for sequentially storing command signals received by the slave
devices and the state signals indicating condition of the slave device, timing signals
generated in the master device, the timing signals transmitted to the slave memories
each, the timing signals stored in the master memory and the slave memories each according
to stored content of the master memory and the slave memories each; and a memory output
means (12) for reading out and displaying the command signals and timing signals stored
in the master device and the received command signals, the state signals, and timing
signals stored in the slave memories.
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