Modbus RTU 16-Ch Relay Module, RS485 Interface, With Multiple Isolation Protection Circuits

SKU: 24921
Part Number: Modbus RTU Relay 16CH
Brand: Waveshare


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Modbus RTU 16-Ch Relay Module, RS485 Interface, With Multiple Isolation Protection Circuits, Industrial-Grade, Rail-Mount Case
RS485 16-ch Relay Module

Modbus RTU Protocol, Multi Isolation Protection Circuits, Safe & Stable & Reliable

Features at a glance

This product is an industrial 16-ch relay module controlled via RS485 bus, adopts Modbus RTU protocol, built-in protection circuits such as power supply isolation, magnetical isolation, resettable fuse, and TVS diode, etc. It also comes with an ABS case.

The Modbus RTU 16-Ch Relay is very easy to use. Due to its fast communication, stability, reliability, and safety, it is an ideal choice for industrial control equipments and/or applications with high communication requirements.

  • Configurable device address (1~255), multi devices can be cascaded on RS485 bus
  • Features flash-on, flash-off function, by passing argument to the command, it is possible to turn on the relay for a while and then close it automatically
  • Onboard unibody power supply isolation, provides stable isolated voltage, needs no extra power supply for the isolated terminal
  • Onboard unibody magnetical isolation, allows signal isolation, high reliability, strong anti-interference, low power consumption
  • Onboard resettable fuse and TVS (Transient Voltage Suppressor), effectively suppress surge voltage and transient spike voltage in the circuit, provides over-current/over-voltage proof, lightningproof & anti-electrostatic
  • Onboard Optocoupler isolation, prevent the relay from being interfered by high-voltage circuit
  • Onboard dedicated relay driver chip, with built-in freewheeling diode protection, the driving ability is stronger and more stable
  • Reverse-proof circuit, prevent the circuit from being damaged accidentally by incorrect connection
  • High quality relay, contact rating: ≤10A 250VAC/30VDC
  • Rail-mounted ABS case, easy to install, safe to use
  • 3 LEDs for indicating the MCU status and signal transceiving status
Operating voltage 5V
Communication interface RS485
baudrate 4800, 9600, 19200, 38400, 57600, 115200, 128000, 256000
Default communication format 9600, N, 8, 1
Relay channels 16
Contact form 1NO 1NC
Communication protocol Standard Modbus RTU protocol
RS485 address 1~255
LED indicators STA: MCU indicator, keep flashing when the MCU normally working
TXD: TX indicator, lights up when sending data
RXD: RX indicator, lights up when receiving data

Onboard multiple isolation protection circuit

Multiple protections, more safe and reliable

Rail-mount case design

Rail-mounted ABS protective enclosure, easy to install, safe to use

RS485 Communication

Configurable device address (1~255), multi devices can be cascaded on RS485 bus
In case of many devices are cascaded, or the communication distance is quite long, it is necessary to use RS485 repeaters

* for reference only, the USB to RS485 is NOT included.

Relay connection

Contact rating of the onboard relay up to 10A 250VAC/30VDC
Directly controlling 220VAC home appliances, or devices below 30VDC

Product show
Outline dimensions

Weight: 0.556 kg

Quick Overview

It is recommended to purchase USB TO RS232/485/TTL or USB TO RS485 at the same time for easy testing.
  1. Modbus RTU Relay 16CH x1
  2. US plug 5V 2A Power supply (with EU head adapter) x1