You CAN add more that one IR543 in the same room and have them set on different house codes. The problem is that when they are both on, the signals collide and become lost. The X-10 IR codes are not house code specific so both IR543’s would send out a 4 on one on one house code and one on the other. Use a contact module to trigger a time delayed relay set for 10 seconds. Then when the module makes its contact, it will start the delay of 10 seconds. One IR543 is hooked to the N.O and one to the N.C. The one on the N.C. and the contact module are set to the same code (lets say A for example). When the number code to the contact module (lets say 16 for example) is sent, it will start a 10 second delay which allows the other IR543 to become active (lets say B). 10 seconds later, house code A returns for use. You could have a macro in the pronto to “automate” the A16 to allow the second IR543 to become active for 10 seconds. Later in the macro you could issue the unit information.

Example macro: What is happening

16 on contact, ten second delay starts allowing IR543 (B) to be on, contact off (momentary)
1.0 sec delay allows unit to be come active
4 on triggers 4 on, on house code B

About 6 seconds later, house code A becomes active again. Unless retriggered by another “change macro”
Use the B code to Trigger all your “home automation” macros and A code to do direct lighting control.

Chris Couture