We have two type of document camera in our school.
Type A:
Document Camera Type A - White Control Panel Built-in DC
Type B:
Wired Connection: You will need to use VGA to HDMI and microUSB to USB for supply the power of VGA to HDMI cable.
Semi-Wireless Connection: Using Printer USB(USB-B) to connect to your laptop and the Document Camera. Download a software from IPEVO. Use IPEVO Visualizer to connect your Document Camera.