Microsoft UNO-3074 user manual Isolated Inputs, Digital Input Connector Signal Description

Table 2.4: Digital Input Connector Signal Description

Signal Name	Reference	Direction	Description
DI <0...3>	COM	Input	Isolated DI signals
COM	-	-	DI, DO isolated
			ground

2.5.2 Isolated Inputs

Each of isolated digital input channels accepts 0 ~ 50 VDC voltage inputs, and accepts bi-directional input. The voltage range is -3 ~ 3 VDC for logic 0 (low), -50 ~ -10 VDC and 10 ~ 50 VDC for logic 1 (high). It means that you can apply positive or negative voltage to an isolated input pin (Vin).

All channels share one common pin (COM). Figure 2.5 shows how to con- nect an external input source to one of the UNO-3074 isolated input chan- nels.

Please note that DI0 and DI2 may be configured as gate control pins of Counter 0 and Counter 1; While DI1 and DI3 may be configured as input pins of Counter 0 and Counter 1. Please refer to section 2.7 for

details

Note: Refer to Appendix A.3 Table A.6 for command of DI

Figure 2.5: Isolated Digital Input Connection

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