So I'm using the Arduino to automate some tasks (setting up an electronic system, as a computer is generally necessary for set up). There are two boards in the embedded system, one that runs over RS232 (created a software serial port to talk to it, it works), and one that runs over USB.
When I connect the system to the USB port on my computer, it works spectacularly (it turns on!). When I connect it to the Arduino, it doesn't do anything. And by connect - I made a USB micro to USB B cable, with a USB A extension coming out, and +5 power available there as well. It allows the cable to be connected to the Arduino and the board, with +5v applied to the rails. When in 'computer' mode, the cable only connects to the video board and the computer (no Arduino or +5v). When the system gets connected to the computer, no data is sent, no programs are turned on, it must recognize that it's connected - and allows it to be turned on (there's a reset switch on the board that I can hit and a green light turns on).
What I want to happen is for me to the connect the Arduino to the video board via USB, have power applied to the +5v and gnd rails, have the video board 'see' the Arduino as a computer (however that happens, I'm not sure - I have an UNO so I can change what it comes up as).
This is something related to work and I don't have access to all of the information about the video board, but I do know it has a pic 18f2550 on it, which has a built in USB transceiver, but unfortunately I can't access the current code on the PIC or change it.
Also - something that I noticed that might be related - when the Arduino is connected to the computer I have it set up to send out some serial commands over the USB port every so often, and when it's connected to the computer it does. The tx/rx lights flash for a bit and shut off. When I connect the Arduino to the video board, it never does anything (tx/rx wise).
So I guess I have two problems:
1) How can I make the Arduino 'blindly' send data over USB?
2) How can I disguise the Arduino to look like a USB port on a computer?