Power Jack, Terminals and Power Regulator
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Power jack of the NB1000 accepts "small" power connectors with 3.5mm diameter. Use 12VDC/1A APR-P0008 (APR-P0009, or APR-P0010) power adaptor supplied by Tibbo or similar adaptor. On the power jack, the ground is "on the outside", as shown on the figure below.
Another way to connect power is through the power terminals located next to the power jack. Ground and "+" terminal positions are shown on the NB1000 drawing. Acceptable supply power range is 10-18VDC (12VDC nominal).
The NB1000 carries an onboard 3.3V switching power regulator that provides stabilized power to the NB1000 itself and to an IB100x interface board, connected to the NB1000 via the IC1000 interboard cable.
Note, that the IC1000 interboard cable also has lines that carry "raw" input power (Vin lines). The IB100x board you are using may have its own power supply.