Topic:Series 2 and Series 3 controllers/sub-controllers may have issues communicating with OSDP readers
Applies to: Mercury Series 2 boards (NSC-100, SSP-D2) and Series 3 boards, including the SSP-LX (LP-4502) when communicating with OSDP readers.
Summary: The OSDP readers are interpreting a non-driven 485-line as data in certain installation environments. This interpretation results in a communication fault that will inhibit the panel and reader from properly communicating.
Resolution: For users deploying series 2 or series 3 boards that are communicating to OSDP readers, place a 1K ohm(Ω) 1% resistor between DAT D0 and GND line. Download tech bulletin below for images.
Download Technical Bulletin (PDF):
TB 18-12 (151 KB)