Automatically switching valve with remote signaling

摘要

A programmable circuit detects drop in pressure of a supplied pressurized gas below a predetermined threshold pressure and automatically switches to a different supply of pressurized gas and automatically contacts a remotely located host computer. The circuit sends status data to the host computer and enters a server mode in which the circuit performs commands issued by the host computer. The commands include commands to change data of the programmable circuit and to download new programming. The predetermined threshold pressure is established by manually setting the supplied pressurized gas to a desired pressure and causing the programmable circuit to measure the pressure of supplied gas and to store the measured pressure as the threshold pressure.