I've made an attempt to decipher the wireless options. Could you see if I've got it right? (If so, perhaps this could go on the wiki).
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First, look at the diagrams in this post:
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LoginTo clear up a couple of things in the diagram: the RX and TX are the same board, and the Lynx Express requires an add-on board.
There are three conceptual wireless modules in these diagrams (but made from only two "wireless" circuit boards):
The TX (Lynx Wireless Transmitter) is a DMX to wireless adapter; consists of a "TX/RX" board jumpered for TX
The RX (Lynx Wireless Receiver) is a wireless to DMX adapter; consists of a "TX/RX" board jumpered for RX
The Lynx Express V2+ can become wireless enabled by adding a daughterboard called the "EX/RX" board which is an onboard wireless receiver
Lynx Express V3+ with EX/RX can also send out DMX to the next board; V2 cannot.
(the TX/RX board is either a TX or an RX; the EX/RX board is an RX daughterboard for the Lynx Express)
The EX/RX can be adapted to some other controllers by soldering a header connector to replace a controller's RS-485 chip, see:
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LoginEach TX can send one DMX universe (512 channels) at 50ms timing. Each is configured to a DMX universe.
Each RX (or EX/RX) can receive one DMX universe, and is configured as to which one. The boards it is connected to (onboard in the Lynx Express case, via DMX and RS485 in the RX case) will determine which addresses in that universe they respond to. More than one RX (or EX/RX) can receive from the same universe.
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(You might be surprised how many places I had to look to discover the above; one can search the forum for a long time and not find the right post, and the wiki seems to be about "how to build it" but not "what is it?"). Then when you do find something in a search, like as not it has been obsoleted

The great diagrams from RRowan were the first big clue, but I didn't understand that the TX and RX were the same board until I scanned the build instructions in great detail and found a step for setting the jumper. Not complaining here, just describing what I see. If there's already a simple page that puts it all together, I couldn't find it.)
There's probably at least one error in the above, but with correction I hope it help somebody else. You can make it a sticky if you want; remove these side comments tho, or I can.