Advantech ICR-3211 Start Manual page 5

Start Guide
Disconnect the router from power supply before handling of the SIM card!
3. Power
The router requires an external DC power supply. The DC voltage required is between
+9 to +36 V DC. The router has built-in protection against reverse polarity without signaling.
Connect the power supply cable to the PWR connector on the front panel of the router (see
Figure below).
QSG-0006-EN, December 10, 2018 4 Released in the Czech Republic