I've now got these very impressive wireless modules working. It is, as I implied above, a bit more complicated than it sounds.
On the good side, it is now possible to alter the remote XRF unit firmware to suit the application using the Raspberry pi as host. There is a good description of the procedure here:
http://openmicros.org/index.php/article ... spberry-pi
No need for the FTDI interface unit mentioned above.
The XRF transmitter units have a good range, and I've found that they work from inside freezers and fridges. Basically, the XRF plugged into the RasPi (using the inexpensive 'Slice of pi' adapter) listens out for signals from the remote XRF units. It can also send configuration commands to a remote unit. The raw readings coming back can be displayed on the Pi using a simple serial terminal such as Miniterm to verify correct operation. What happens after that is limited mainly by the Python programming skills of the user.
A number of remote XRF units can be monitored simultaneously. Each is given a two-character ID which is transmitted with each data packet. The units can monitor a number of environmental variables using small self-powered add-on boards with a few components that need to be assembled.
There is a support forum, and in my experience support there is almost instantaneous
http://openmicros.org/index.php/compone ... t?Itemid=0