In addition to the external devices, there is
a DVM used directly by the computer to read any
analog signals up to 256 in number. The DVM and
its reed relay matrix are treated as a device.
All devices appear to the computer as a 16 line
unit or units which knows each only as an address;
thus any device can be added to the system,
including a control box that can display a digital
readout of an analog signal and a display of the
control setting. Then, with a selector digiswitch
for the address and a plus-minus generator for
controlling, any other device can be controlled
remotely through the computer.