I was wondering if anyone had ever come across a document that details the reliability of messaging of various protocols. I am working on a project for critical facilities and we have come across the need to determine what happens if a control device or panel completely locked up (Processor stopped and watchdog failed to restart). Would the various protocols all be intelligent enough to pick up on this and alarm the fact at the head end? It seems to me that some protocols especially those that are registry based would likely just hold and continue to deliver the last known good value and ass such information might appear normal and yet systems be offline.
I am fairly sure that there must be documentation around this in existence and didn't want to recreate the evaluation. So if anyone know of something the assistance would be appreciated.
As a second point if anyone had any idea's on work around to verify proper operation despite protocol weaknesses those would be be welcome as well.
Thank you very much!