PURPOSE: To easily analyze a cause for a failure in communication, by respectively illuminating a display light, with a controller which transmits and receives an operation signal with a sequential controlling procedure and each controlled device receiving the signal and transmitting the signal to the controller.
CONSTITUTION: In a controllers SV, a transmitter TR-SD transmits a signal in accordance with a sequential controlling procedure to illuminate a display light. For example, when a receiver RV-TD receives a transmission signal in a controlled device TML1, a display light is illuminated. When the TML1 transmits a response signal to the controller SV, the transmission is performed by using a transmitter TR-TD to illuminate the display light. When the signal is received with the receiver RV-SD of the device SV, the display light is illuminated. Thus, each time one controlling procedure is finished, the display light is illuminated and when a failure is produced for the communication between the controller and the controlled device, the cause can easily be analyzed.
NAKAMURA SHIGERU
KURATA MASAAKI
TOMIZAWA SHINICHI
SASAKI YASUHIKO
