STjh Modbus RTU EC FFU controller with RS485 terminals, address switches and diagnostic display

STJH-EC-FFU-SPEED-CONTROLLER-MODBUS

FFU Speed Controller Modbus RTU EC

A digitally addressed EC FFU controller with speed, status and fault communication over RS485.

Modbus RTU over RS485
Speed and status readback
Fault history and addressing

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Product Introduction

This controller uses Modbus RTU over RS485 to send speed commands and return fan status and fault history. Addressing can be manual or use DCI auto-addressing where supported by the fan platform. It is intended for large FFU networks that require central commissioning and continuous operating visibility.

Key Features

Bidirectional communication

The network carries commands and operating feedback rather than a setpoint alone.

Network commissioning

Addressing identifies each FFU for central supervision.

Fault traceability

History data helps locate recurring fan problems.

Technical Parameters

Control Mode	Modbus RTU
Physical Network	RS485
Commands	Fan speed
Readback	Operating status
Diagnostics	Fault history
Addressing	Manual or DCI auto-addressing by fan platform
Motor Compatibility	Network-capable EC fan
Application Scale	Large FFU networks
Software Interface	Compatible EC-control platform
Customization	Available based on the intended application and operating environment.

Applications

Designed for large cleanroom fan networks needing central commissioning, continuous monitoring and device-level diagnostics. Topology and termination should follow the selected fan platform.

Solutions for Your Application

Analog control provides no device status or fault detail.Use Modbus RTU for command and readback on the same RS485 network.

Manual identification becomes difficult across many FFUs.Apply planned addresses or supported DCI auto-addressing during commissioning.

Available Options

Define fan count, addressing method, baud settings, network topology, software and gateway connection. Confirm compatibility with the exact EC platform.

Planning a FFU Speed Controller Modbus RTU EC specification?

Send us your dimensions, installation conditions, performance targets and required surface finish.

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