| 摘要 |
PURPOSE:To superimpose an address data on a power supply line, by providing a means setting an address which selects one of terminal devices to a master set, and a means converting the address to an address data of the self-clock system to superimpose the converted result on the power supply line. CONSTITUTION:A terminal device 2 is connected to the master set 1 at the central side controlling the temperature of a building, and a power supply and address line l1, a common line l2 and an observed data line l3 are connected between both the devices. In case of monitor, addresses A7-A0 are set to input terminals I7-I0. This address is converted into an address data of a self-clock system and superimposed on the power supply line at an address data power supply superimposing circuit 8. A terminal device 2 detects the coincidence between an address data transmitting from a sensor for temperature or the like and the own address, and when they are coincident, the detecting signal of the sensor is converted into current information and returned to the master set 1 via a data line. |
