Using the "Search" button at the top, try keyword "reliance" or "automate"
Try this site for information: http://www.automation-consulting.com/aps/aps.htm
There was a hand held programmer made for these units as well as programming software. If you are going to use a computer you will need an old DOS based computer (Windows98 or older) and some software called "APX" programming software. The comm port uses standard RS232. I have an old manual somewhere if you need more info.