for transmitting...
you need
TX/RX pcb, case,and parts (kits 1,2,and 3)
you only need one of these to do the transmitting (jumper set to TX)
FOR RECEIVING
if you want to receive to any dmx device...
you need
TX/RX pcb, case, and parts (kits 1,2,& 3)
you can place this anywhere, and connect to a device, then continue with other devices with cat5 cable (also note, the TX/RX has a power cable to power it) (jumper set to RX)
if you want to receive on an express...
you need
EX/RX pcb, and parts (kits 4 & 5)
you can setup one, or all of your Expresses for wireless, then you can setup wired devices off the DMX OUT 2 port on the Express (don't forget to remove the REMOVE FOR WIRELESS jumper)
if you want to receive on a single ssr4, mr16, or Freestyle...
you need
EX/RX pcb, and parts, and the socket adapter (kits 4,5 & 6)
going this route, you would need this for every device you wanted to connect to wireless in this manner. plus, you can't add wired devices for the dmx out of that part (forexample, the ssr4 [also note the ssr4 NEEDS to have the DMX addon for it to work with wireless])