Advantech DVMB-554E - Manual (Page 36)

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2.13 DVA-210 Connector (VDO1)
DVMB-554E has 4 video capture chips on board. So it can support up to 4
cameras. To be connecting with cameras, DVMB-554E needs to work with
DVA-210 for video capture. DVA-210 is a 4 channel video module with
BNC connectors and you can find it in DVMB-554E accessory box.
2.14 Auxiliary 4-pin power connector (ATX1)
To ensure the enough power is supplied to the motherboard, one auxiliary
4 pin power connector is available on the DVMB-554E. ATX1 must be
used to provide sufficient 12 V power to ensure the stable operation of the
system.