BACnet

BACnet COV vs Polling: Tradeoffs and When to Use Each

Integrators default to polling everything and discover the network can't keep up, or default to COV and discover subscriptions silently lapse without producing an alarm.

BACnet Write Priority Array Explained

Operator writes to a commandable object appear to succeed but Present_Value never changes, or an override gets stuck because no one wrote NULL to release the slot.

BACnet Network Number Best Practices for Multi-Site Portfolios

Integrators reuse network number 1 across sites; collisions break BACnet routing the moment buildings are interconnected through a campus backbone or BBMD.

BACnet MS/TP Wiring Best Practices

Improper wiring (T-taps, missing termination, wrong cable) causes intermittent failures that are hard to diagnose.

BACnet Trending: Configure and Export Trend Logs

Extracting historical data from BACnet Trend Log objects for analysis or compliance reporting.

BACnet Network Number Planning Guide

Conflicting network numbers after adding routers cause routing loops and device unreachability.

BACnet Duplicate Device ID: Find and Fix It

Two devices sharing a device instance number cause data collisions, lost messages, and control failures.

BACnet/IP to MS/TP Router Configuration

Bridging BACnet/IP supervisors to MS/TP field trunks requires correct IP settings, MAC addresses, baud rate, and network number assignment.

How to Fix BACnet MS/TP Address Conflicts

Duplicate MAC addresses on an MS/TP trunk cause intermittent communication failures and CRC errors.

BACnet BBMD Setup: Multi-Subnet Discovery

WHO-IS broadcasts stop at subnet boundaries; devices on other VLANs are invisible without BBMD.

BACnet Device Discovery Not Working: Fix It

WHO-IS requests go unanswered; causes range from firewall rules to duplicate device IDs to subnet mismatches.

BACnet Secure Connect (BACnet/SC) Setup Guide

BACnet/SC requires TLS certificates, hub configuration, and WebSocket setup that most technicians have never done.