Advantech USB-4761 user manual Isolated Digital Input Connections, Relay Connections

3.3 Isolated Digital Input Connections

3.3.1 Single-ended Channel Connections

USB-4761 has 8 isolated digital input channels. Each of isolated digital input channel accepts 10~30 VDC voltage inputs, and accept bi-direc-

tional input. It means that you can apply positive or negative voltage to an isolated input pin (Vin ). The figure below shows how to connect an external input source to one of the card's isolated input channels.

Figure 3.2: Isolated Digital Input Connections

3.4 Relay Connections

After power on, the initial relay output status is shown as below:

Figure 3.3: Relay Output Channel Connections

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