Here is a Work-Around to set the House and Unit Codes for Security Devices. This Work-Around can be found in another thread and was found by JMac if memory serves me right. I reworked it into a graphic illustration which I hope will make it clearer.
(http://www.bdshost.com/X10/ss1.jpg)
(http://www.bdshost.com/X10/ss2.jpg)
(http://www.bdshost.com/X10/ss3.jpg)
(http://www.bdshost.com/X10/ss4.jpg)
(http://www.bdshost.com/X10/ss5.jpg)
(http://www.bdshost.com/X10/ss6.jpg)
(http://www.bdshost.com/X10/lpup.gif)---(http://www.bdshost.com/X10/lpup.gif)---(http://www.bdshost.com/X10/lpup.gif)---(http://www.bdshost.com/X10/lpup.gif)---(http://www.bdshost.com/X10/lpup.gif)----KDR