I ordered up a USB CAN converter, a pretty cheap unit from www.canusb.com (Blue device in picture above). Then I re-programmed one of the VIC-E units to simply transmit a message on the bus. It wasn't long before I had some satisfactory results, and after spending the rest of last week and the weekend working on the CAN / VIC-E conversion its pretty much done.To simplify things, I have left the configuration of VIC-E under RS485 control, and the position and feedback via CAN. This means that to change PID settings I plug in a USB to 485 converter to the VIC-E, change settings and can test the output result by driving the valve through the CAN bus interface.
I have written a new windows application to control the valves via the CAN bus, and changed the existing windows app that usees the RS485 bus for configuration.
|CANBus Debug View|