BACnet Modbus gateway is built in BACRouter. It maps data in Modbus slaves into BACnet objects inside BACRouter. The features of gateway functionality includes:

• Supports TCP/RTU/ASCII slave devices.
• RS485 ports could work as BACnet MS/TP or Modbus master.
• Two mapping modes are select-able by user: Virtual BACnet Device Mode and Single BACnet Device Mode.
• One physical slave device could be mapped to multiple logic slave devices.
• Different baudrate (1200~115200), parity (Even, Odd, None), RTU/ASCII mode slaves could co-exist on same RS485 bus.
• Due to real-time system, more slave devices are tolerated on RS485 bus without dropping performance.
• Supports up to 128 masters, 128 slaves and 1000 points.
• Supports AI/AO/AV/BI/BO/BV/MI/MO/MV BACnet object types.
• Allows up to 2048 COV subscriptions. Network storm caused by slave device’s online/offline could be avoided by limiting COV notification.
• Convenient WebUI functions to deal with batch of mappings.
• Online testing read/write Modbus device from WebUI to verify the mapping.
• Conversion between Modbus and BACnet values could be executed from WebUI to verify.
• Lua scripts is supported to convert between Modbus registers and BACnet analog value. User could create/edit/debug script from WebUI.
• Configured by WebUI, no additional software is needed.