STjh FFU BMS gateway with dual RS485 terminals, Ethernet socket and DIN-rail mounting clip

STJH-FFU-BMS-GATEWAY-MODBUS-TCP

FFU BMS Gateway Modbus RTU-to-TCP

A transparent RS485-to-Ethernet bridge for connecting Modbus RTU FFUs to a Modbus TCP supervisor.

Modbus RTU field protocol
Modbus TCP BMS protocol
RS485-to-Ethernet bridge

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Introducción del producto

This gateway connects a field network of Modbus RTU fan filter units to a Modbus TCP building supervisor. It translates the physical path from RS485 to Ethernet while preserving the Modbus data model. The product is selected when the FFU layer already uses RTU and the facility BMS expects TCP rather than BACnet or an IoT protocol.

Características clave

Protocol continuity

Both sides use Modbus, reducing semantic translation between fan data and the supervisor.

Physical-layer conversion

RS485 fan wiring is exposed through an Ethernet connection.

FFU-focused integration

The gateway links speed, status and alarm points to the facility network.

Parámetros técnicos

Field Protocol	Modbus RTU
BMS Protocol	Modbus TCP
Field Physical Layer	RS485
Upstream Connection	Ethernet
Aplicación	FFU network integration
Data Direction	Bidirectional commands and status
Address Mapping	Configured to fan network addresses
Installation	Control enclosure or network panel
Supervisory System	Modbus TCP client
Customization	Disponible según la aplicación prevista y el entorno operativo.

Applications

Suitable for facilities whose BMS uses Modbus TCP while ceiling fans communicate over RTU. Registers, unit addresses and network security should be documented before integration.

Solutions for Your Application

The BMS Ethernet interface cannot connect directly to RS485 fans.Use the gateway to bridge Modbus RTU to Modbus TCP.

Unplanned register mapping causes incorrect commands.Freeze the point list and address map before BMS testing.

Opciones disponibles

Specify RS485 segment count, Ethernet settings, address map, enclosure and power supply. Confirm the BMS acts as a compatible Modbus TCP client.

Planning a FFU BMS Gateway Modbus RTU-to-TCP specification?

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