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What hardware & software is used between the computer & the relay.
And got the following answer:
The electrical relay is usually controlled by a very low voltage, usually that of a digital electronics circuit, with a range of 0 to 5 volts. The relay itself, of course, is also rated to carry a particular maximum analog voltage being controlled by this 'switch'. To get a computer to control this, it is probably best to use existing hardware designed to do it. Back in the 80's (and they are apparently still around) I've used an Optomux board which had a serial interface to which I could connect a computer. The Optomux serial 'protocol' seemed to work very well for this purpose. The computer would send commands over the serial port to control the board to turn relays on and off for controlling pump motors. If you want to do this raw, you will definitely need a UART for communication as well as the relays and any interim digital/analog conversion chips.