red lion BT-6821-AT-AC User Manual page 52

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DC 2.5mm round plug for all models except the BT-5x00v2 series

PoE (Power over Ethernet) for BT-6x01EB models
WARNING
DC 2.5mm Barrel Adapter shall not be used in hazardous locations.
11.7.1 Powering up the modem
The modem will power up as soon as an 8 to 30 VDC voltage is applied to one of its power inputs and shuts off when this
input voltage is below 4 VDC.
In addition, BT-5x00v2 modems require the IGN signal to be ON for the modem to start. When BT-5x00v2 modems
detect the IGN signal transition to OFF, it engages its shutdown after a programmable delay.
11.7.2 Testing the power connection
Check the PWR light on the modem: if it is turned on then the modem is powered. If it's off, then review the installation
procedures.
If LED indicators are not accessible to the installer, a computer can be used to verify its functionality by running BlueVue
Device Manager and attempting to connect to the modem.