HRW Limited
Unit E, 11/F, Sun Ying Industrial Centre
Ph +852 2546 7402
9 Tin Wan Close, Tin Wan
Fax +852 2546 7403
Hong Kong
www.hrw.hk
HPE-MRBN –
BACnet MS/TP Gateway to Modbus RTU 485
FW4.01
Integration of BACnet MS/TP conforming devices in to Modbus RTU based systems. Up to 247 BACnet
MS/TP devices may be connected to the gateway for read access of up to 250 BACnet data objects
Typical Applications
Modbus RTU 485 network integration of BACnet MS/TP devices:
HVAC Controllers
PMAC770 electricity meters (c/w BACnet module)
Sontex SC531 chilled/hot water energy integrators (c/w BACnet module)
Belimo energy Valves *
*
Belimo energy valves should have dedicated gateway, with System Vendor ID# 423 (SV=423) set in the gateway.
Other BACnet devices may share a gateway, with default SV=0 setting.
Feature Summary
Modbus RTU RS485 slave port (BMS port)
BACnet MS/TP master-slave/token-passing (Sub-bus port)
User customised BACnet object data based
Modbus Long Integer and IEEE Floating Point register address ranges
Smart-polling of BACnet objects (only actively polled when active on the Modbus BMS side)
