If these are controlled the same as the Tubes - which seems likely since they run on Tube controllers as well - you would need a USB-UART adapter's RX, TX and GND lines. I think it's a 3V3 signal voltage. But the actual protocol was a nine-data-bits, I think no parity, at 460800 baud, which isn't a mode that many converters support. I'd be surprised if the one he bought would do it, based on what Novak turned up while working on RPi support before AM released their cgminer stuff.