LONMARK International announced that the Access Point Controller (APC-300) from Circon Systems is the first product to be certified using Version 3.4 of the LONMARK Interoperability Guidelines. The LONMARK Certified Access Point Controller provides facility professionals with a scalable and interoperable access control solution that can be connected to a network of LONMARK certified products from a variety of different vendors. The LONMARK open architecture allows seamless connectivity between devices and subsystems such as access control, lighting, sun blinds, generators, HVAC, safety and more.