The Renard 24 is an all in one board. Everything it needs is right on the board. No need for anything else. You just plug the Ren 24 right into the serial port or usb-serial adapter and you will be flashing lights. You can daisy chain many ren-24s one after the other. The only limit is the determined by the timing interval used in Vixen and the baud rate used. You can find out more about thet on the Christmas Wiki in the General Renard information page.
Brian, your friendly site Admin.
2013 stats, if all goes as planned:
2688 pixels, 4 E68x, 1450 RGB leds, 90 DMX channels