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Green circuit board with sixteen black relay blocks inside a grey DIN-rail enclosure

WaveShare

WaveShare Modbus RTU 16-Ch Relay Module RS485 Rail-Mount

SKU CH-0V0Z-PK4W8

A 16-channel Modbus RTU relay module with RS485 interface, configurable addresses up to 255, and multiple isolation protection circuits for industrial rail-mount use

  • Controls 16 relays via Modbus RTU over RS485 bus
  • Cascades up to 255 devices using configurable addresses
  • Isolated power supply and signals block interference
  • Onboard fuse and TVS protect against surges
  • Optocoupler isolation shields relays from high-voltage circuits

16-Channel Modbus RTU Relay Module

This WaveShare module provides 16 relay outputs controlled over an RS485 bus using the Modbus RTU protocol. It is built for industrial automation tasks where multiple circuits must be switched from a single controller. The rail-mount enclosure suits cabinet installations in machinery and process equipment.

Cascaded addressing up to 255 devices

Each unit accepts a configurable address from 1 to 255, allowing many modules to share one RS485 line without extra wiring. Onboard isolation in the power supply and optocouplers on the signal side keep noise and ground loops from disturbing the relays. A dedicated driver chip with integrated freewheeling diodes ensures stable switching even under heavy inductive loads.

Replaces discrete contactor banks

The module consolidates what would otherwise require a row of individual starters or a larger PLC output card, saving panel space and wiring time. Built-in TVS diodes and a resettable fuse protect against surges and over-current events that damage simpler relay boards. The jump is worth it when a project needs dense, protected switching with Modbus RTU integration and no separate isolated supply.

Highlights

  • Controls 16 relays via Modbus RTU over RS485 bus
  • Cascades up to 255 devices using configurable addresses
  • Isolated power supply and signals block interference
  • Onboard fuse and TVS protect against surges
  • Optocoupler isolation shields relays from high-voltage circuits

Specifications

No published specifications for this item yet.

Questions about this item

Can the 16-channel relay module share an RS485 bus with older Modbus RTU devices using different addresses?

Yes, the address is configurable from 1 to 255 so multiple devices can be cascaded on the same RS485 bus without conflict.

How can I verify the module is communicating correctly after wiring it to the RS485 network?

Send a Modbus RTU command to the configured address; the onboard relays will respond and the flash-on or flash-off function will activate the selected channel for the specified duration.

Does the rail-mount case include the RS485 cable or terminal plugs, or must I source them separately?

The module integrates the isolated power supply, optocoupler isolation, resettable fuse and TVS protection on board; external RS485 wiring and terminal connectors are not included and must be provided separately.

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