Be sure to use the correct installation manual. If you have a PAR200, you must use that manual. The way the 200 and 200A is configured for Com 1 and Com 2 is different. The 200A uses a strap in the back connector while the 200 uses DIP switches that requires the removal of the top cover.
PS Engineering :home and go to bottom of home page and click on Product Support. There you will find the PAR200 install manual.
Hope this helps.
Mark scheuer