Power Connection; Figure 2.10:Pin Assignment Of The Power Connector - Advantech EKI-6538 User Manual

2.6 Power Connection

EKI-6538 supports dual +10 ~ 48 V power inputs and power-fail relay
DC
output.
Figure 2.10: Pin Assignment of the Power Connector
You can connect an alarm indicator, buzzer or other signaling equipment
through the relay output. The relay opens if power input 1 or 2 fails.
("Open" means if you connect relay output with a LED, the light would
be off)
19 Chapter 2