Industrial Modbus RTU 8-ch Relay Module (B) with RS485 Interface, Multi Isolation Protection Circuits, 7~36V Power Supply

SKU:25739
Part No.:Modbus RTU Relay (B)
Brand:Waveshare

$29.99
PriceQuantity
$28.992+
$28.493+
$28.294+
Related Products:
Description

Details

Industrial Modbus RTU 8-ch Relay Module (B) with RS485 Interface, Multi Isolation Protection Circuits, 7~36V Power Supply
RS485 8-ch Relay Module (B)

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

Features At A Glance

This is an industrial 8-ch relay module controlled via RS485 bus, utilizing Modbus RTU protocol. It features embedded protection circuits such as power isolation, magnetical isolation, and TVS diode, etc. It also comes with an ABS enclosure. The Modbus RTU Relay (B) 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 requirement.

  • 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
  • Adopts dedicated relay driver chip, with built-in flyback diode protection, for stronger and more stable driving ability
  • Reverse-proof circuit, prevent the circuit from being damaged accidentally by incorrect connection
  • High quality relay, contact rating: ≤10A 250VAC/30VDC
  • Rail-mounted ABS plastic enclosure, easy to install, safe to use
  • 3 LEDs for indicating the MCU status and signal transceiving status

Specifications
PRODUCT Modbus RTU Relay Modbus RTU Relay (B)
Power supply 5V 7~36V
Communication interface RS485
Baudrate 4800, 9600, 19200, 38400, 57600, 115200, 128000, 256000
Default communication format 9600, N, 8, 1
Relay channels 8
Contact form 1NO 1NC
contact rating ≤10A 250VAC/30VDC
Communication protocol Standard Modbus RTU protocol
RS485 address 1~255
LED indicators STA: MCU indicator, keeps flashing when the MCU normally working
TXD: TX indicator, lights up when sending data
RXD: RX indicator, lights up when receiving data

Hardware Analysis

Multiple protections for safer and more reliable use

Enclosure Design

Rail-mounted ABS plastic 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 communication distance is quite long, it is necessary to use RS485 repeaters

for reference only, the USB TO RS232/485/TTL converter 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

Applications
Product show
Outline dimensions
Resources & Services

* Resources for different product may vary, please check the wiki page to confirm the actually provided resources.

Selection Guide
productModbus POE ETH RelayModbus POE ETH Relay (B)Modbus POE ETH Relay 30CHModbus RTU RelayModbus RTU Relay (B)Modbus RTU Relay (D)Modbus RTU Relay 16CHModbus RTU Relay 32CH
 
Communication parameters
Communication interface Ethernet port (PoE support) RS485 port
Baud rate - 4800,9600,19200,38400,57600,115200,128000,256000 (configurable)
Default communication format - 9600, N, 8, 1
Communications protocol TCP/UDP/MQTT RS485 protocol
Modbus protocol Modbus RTU Protocol or Modbus TCP Protocol Modbus RTU Protocol
Device address Unconfigurable, identify the devices by IP address 1~255 (configurable, supports cascading multiple devices)
control interface
Output control (DO) 8-ch relay 30-ch relay 8-ch relay 16-ch relay 32-ch relay
Contact form 1NO 1NC
Contact rating ≤10A 250VAC/30VDC
DIGITAL INPUT - 8DI, 5~36V, passive / active input (NPN or PNP), built-in bi-directional optocoupler isolation - 8DI, 5~36V, passive / active input (NPN or PNP), built-in bi-directional optocoupler isolation -
Others
Power Supply PoE port, DC 5.5*2.1 power port, or screw terminal DC 5.5*2.1 power port, or screw terminal
Power range 7~36V wide range 5V 7~36V wide range 5V 7~36V wide range
Dimensions 145×90×40mm 175×90×40mm 300×110×60mm 145×90×40mm 175×90×40mm 200×110×60mm 300×110×60mm
Installation Standard DIN 35mm rail mounting, wall mounting

Weight: 0.244 kg

Quick Overview

Modbus RTU Relay (B) x1