If your wanting to learn programming buy a used SLC 150 and a hand held programmer. These are like computers the old ones get cheaper and cheaper until the company stopping making them then the prices start going up because people that have them already programmed do not want to spend big $$$ to buy a new unit then pay someone to program it. Here is a link to an SLC150 you want 120 VAC unit with a hand held programmer. 5 years ago these were dirt cheap $20 each now there is a shortage of used stuff so prices are going up. Buy one hang on to it a while then you can sell it for more than you paid. These are really cool you can program all sorts of things at home. Program lights, TV, stero, vacuum cleaner, dog barking sounds, all sorts of things to go on/off as if someone is home when you gone on vacation to keep thieves away. Program lights and TV to come on automatically when you enter a room and go off when you leave. Lots of fun to play with. The SLC 500 replaces the SLC 150 these were about $1000 each when they were new technology. Do not buy the DC unit unless your using magnetic switches as inputs. The expander can be added on to double memory size you can addd as many expanders as you like. Expander has to match the unit you already have you can not connect a AC unit to a DC unit. If you watch you can find some computer software for these units but you will need an old 486DX computer to programming instead of the hand held programmer. The computer is much faster than the hand held programmer plus you can view your whole program on the computer screen the hand held unit only lets you view 1 line.
**broken link removed**
**broken link removed**
**broken link removed**
**broken link removed**