PURPOSE: To provide visual displays which employ fluorescent display tubes and large luminous diodes by constituting the lead wire which connects the microcomputer control section and the remote controller of gas equipment of a three lines, namely a power line, a signal wire for transmitting various signals, and an earth line.

CONSTITUTION: The microcomputer controller 1 and remote controller of gas equipment are connected by a power line (a), an earth wire (b), and signal wire (c) for transmitting various signals in serial system. And, electric power is constantly supplied through a power line (a) from the microcomputer control section 1 to the remote controller 2, and the signals between the microcomputer control section 1 and remote controller 2 are transmitted through the signal line (c). On the remote controller side there are various switches such as an operation switch, up-down switch for setting temperature, etc., and lamp circuits for display, and the microcomputer control section of the gas equipment controls automatically the combustion of the gas equipment according to the conditions set by the remote controller. With this arrangement it is possible to carry out visual remote control which employs parts of a large electric power consumption by supplying a sufficient electric power to the remote controller from the microcomputer control section of the gas equipment.