Computer Controlled Relay

Figure 4 shows the circuit for the computer controlled relay (Relay B). This can be used for switching circuits which you wish to have isolated from the computer. The circuit operation is the same as for figure 3, the exception being that the relay "B" is operated with plus 12 volts, while relay "A" of figure 3 is operated with plus 5 volts. The relay contacts are brought out on the face of the interface box and designated NO for Normally Open and NC for Normally Closed. The contact arm is designated COM for Common.

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