EtherWAN EX94000, Быстрый старт

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Hardened Ethernet Switch
Alarms for Power and Port Failure
Step 1: There are two pins on the terminal block are used for power failure
detection. It provides the normally closed output when the power
source is active. Use this as a dry contact application to send a
signal for power failure detection.
Special note:
The relay output is normal open position when there is no power to the
switch. Please do not connect any power source to this terminal to
prevent the shortage to your power supply.
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