1. The IR543 converts IR to powerline signals for your X10 components, no FR involved.

2. The X10 codes are already in the MX500 database, under AUX.

3. Any cheap RadioShack or OneForAll remote is helpful, since the MX500 only has UnitCodes 1-9.

4. You can only use ONE HOUSECODE with the IR543! If you want to use more you'll need an IR543AH and a Pronto style remote.
Don't panic! with one HouseCode you can still control 16 devices.

5. For great deals look here:
[Link: homeautomationnet.com]