First thought - do you have the AC16 DMX firmware installed. If not, then you are out of luck. The lynx dongle can only output two protocols - either DMX or pixelnet. There is no support for the d.light protocol.
Second thought, assuming you have the DMX firmware, make sure the lynx dongle is programmed for DMX and that the dmx hookup is correct. Lynx uses wire pair #1, wires 1&2 for data output. I'm not sure off the top of my head which one is + and which is - ...
I also have no idea what d.light uses.
Good luck.
RM