| 摘要 |
<p>PURPOSE:To heighten reliability, by eliminating the distribution circuit of another slave device at a terminal, connecting in parallel the output terminals of transistors, and supplying a voltage from another device when the DC power source of the slave device is cut off. CONSTITUTION:The output signal of a driver circuit 2 to transmit an information signal from a host device to the slave device, is inputted to each of reception circuits 23-1-n in plural sets of the slave devices through the use of the signal line 91 of a cable 19. Respective DC power source in the reception circuit 23 is connected to the emitter of a transistor (TR) 7 so as to be supplied through the TR respectively, and also, it is inputted to the input terminal 8a of a driving circuit 8. Also, the collector of the TR 7 is connected to the input terminal 5a of each corresponding distribution circuit of the circuits 5-1-n, and also, they are connected in parallel by the connecting line 92 of the cable 19. In this way, when the plural sets of slave devices are connected to one host device, and signals are transmitted, the power source can be supplied from another device even when the DC power source of the slave device is cut off.</p> |
