Data highway system

Abstract

Abstract PURPOSE:To eliminate the effect of an earth potential between devices by coupling a transmission line and each transmission device with a photocoupler. CONSTITUTION:In transmitting a data signal from a data transmitter 26, moving contacts 27-1, 28-1 of changeover switches 27, 28 and contacts 27-3, 28-3 are connected. Then a data is transmitted to a transmission line 24 by turning on/off a constant current circuit 29 via a transistor 32 with a data signal 33 to transmit a data to a data transmitter 26 of an optional data terminal station 25-j. A light emitting element 31 of a photocoupler 30 of the data transmitter 26 at the reception side is operated in response to the data signal and a photodetector 32 receives the data. Thus, generation of data fault due to the difference of earth potential between the data transmitters is prevented.

Inventors

• 👤 Kenji Mizui
• 👤 水井　賢司
• 👤 Osamu Yoshida
• 👤 美田　修

Bibliographic Details