Topic: Series 3 Boards and LX controllers may be impacted when communicating with OSDP readers
Applies to: Series 3 Mercury boards and SSP-LX controllers communicating with OSDP readers
Summary: 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 the series 3 boards or LX controllers, place a 1K ohm(Ω) 1% resistor between DAT D0 and GND line. This will create a communication bias that will keep the reader from improperly interpreting data. To function properly, there must be NO ground faults in the installation.
Download Technical Bulletin (PDF):
TB18-5 (271 KB)