Interlogix NS3550-2T-8S User Manual - Manual (Page 45)

IFS NS3552-8P-2S AND NS3550-2T-8S User Manual
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Figure 2-8 Wires DI0 and DI1 to Open Detector
4. There are two Digital Output groups for you to sense the Industrial Switches port failure or power failure and issue a high or
low signal to external device. The following topology shows how to wire DO0 and DO1.
Figure 2-9 Wires DO0 and DO1 to Open Detector