Details
In general usage, following combination is common to provide 24V power to DataMan series.
CCB-PWRIO-xx (xx is the length)
External 24V power supply. e.g. ACC-24I
If you want to have simple connection and do desktop evaluation or smarter demo, you can use following accessory.
DMV-PS-02

This is the 24V power supply that directly connects DM290 (and also other readers and verifier which have M12-12pins I/O connector) to a wall outlet. Includes an adapter cable to make the direct connection possible to the M12 pin as well as both EU and US plug styles.
Note: If you need to have I/O capability or RS-232 communication, you need to use flying lead cables, CCB-PWRIO-xx.