PICALLW TOOLS
Free engineering and research tools
Free PICALLW web tools for BACnet, Modbus, KNX, HVAC and basic GDV image capture quality checks. No login and no installation.
These tools are designed for quick checks in the field, during engineering work or research. For control and diagnostic tasks, always verify the result against device documentation and the actual system.
BACnet
BACnet Device ID checker
Check Device instance validity, duplicates and the reserved wildcard value.
Open tool → ModbusModbus value converter
Convert 16- and 32-bit registers, signed/unsigned, Float32 and common byte/word order combinations.
Open tool → Modbus RTUCRC-16 calculator
Calculate Modbus RTU CRC-16, verify a frame and show the on-wire byte order.
Open tool → KNXKNX group address helper
Encode and decode 3-level, 2-level and raw 16-bit KNX group address values.
Open tool → HVACHVAC PI/PID calculator
Starting values using SIMC PI and Ziegler–Nichols methods, with practical commissioning cautions.
Open tool → GDV / EPIGDV Image Quality Checker – demo
Local technical image-quality analysis: sharpness, clipping, contrast, centering and resolution.
Open demo →