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8-Channel Modbus RTU Latching Relay Module (C) with RS485, Rail-Mounted
· MPN: 30460
The 8-Channel Modbus RTU Latching Relay Module (C) is an industrial-grade relay controller with RS485 communication, designed for reliable automation in dema...
The 8-Channel Modbus RTU Latching Relay Module (C) is an industrial-grade relay controller with RS485 communication, designed for reliable automation in demanding environments. The latching relays retain their state after power loss, ensuring consistent operation without manual reset.
Communication and power are fully isolated with onboard opto-isolation, resettable fuse, TVS diode protection, and reverse-polarity protection. The module supports cascading up to 255 devices on a single RS485 bus via configurable addresses, and includes flash-on/flash-off timing control for automated relay scheduling.
Key Features
- Latching Relays – Retain state after power loss, no manual reset required
- Modbus RTU Protocol – Standard industrial protocol for seamless integration with PLCs and SCADA
- RS485 Communication – Opto-isolated with magnetic isolation for signal integrity
- Cascadable – Configurable device address (1–255) for multi-module RS485 bus networks
- Flash-On/Flash-Off – Built-in timing control for automatic relay scheduling
- Surge Protection – Resettable fuse and TVS diode for lightning and ESD protection
- Reverse-Polarity Protection – Safeguards against accidental wiring errors
- Rail-Mounted Enclosure – ABS plastic case for DIN rail installation
Specifications
- Relay Rating: 10A at 250VAC / 30VDC
- Contact Configuration: 1NO + 1NC per channel
- Power Supply: 7–36VDC
- Default Baud Rate: 9600 bps (N, 8, 1)
- Available Baud Rates: 4800–256000 bps
- LED Indicators: 3× (STA, TXD, RXD)
- Dimensions: 145 × 90 × 40 mm
- Weight: 233 g
Ideal For
- Industrial automation and control systems
- Building management and lighting control
- Remote relay switching via RS485 networks
- PLC and SCADA integration
Package Contents
- 1× 8-Channel Modbus RTU Latching Relay Module (C)
Resources
Jargon buster
Plain-language definitions for the technical terms used above.
- baud
- Baud is the signalling rate of a serial connection, often used as the speed setting for UART communication. Matching the baud rate matters because both connected devices must use the same setting for readable data.
- DIN rail
- DIN rail is a standard metal mounting rail used inside industrial electrical cabinets. DIN rail mounting matters because it lets the controller be installed neatly alongside power supplies, relays, and other automation hardware.
- ESD protection
- ESD protection helps protect electronics from damage caused by static electricity discharges. It is useful on development boards because cables, sensors and modules are often plugged and unplugged during prototyping.
- LED
- A light-emitting diode is a small electronic component that lights up when current flows through it in the correct direction. In this kit, LEDs create the flashing effect, so polarity and correct soldering matter for the project to work.
- Modbus
- Modbus is an industrial communication protocol used by many meters, sensors, PLCs, and automation devices. Modbus support matters because it can make the controller easier to integrate with existing industrial equipment.
- Modbus RTU
- Modbus RTU is a version of Modbus commonly used over RS485 serial wiring. It matters if you need to connect the controller to industrial sensors, meters, or drives that use serial Modbus rather than Ethernet.
- RS485
- RS485 is a robust wired serial communication standard often used in factories, farms, and buildings where cables may be long or electrically noisy. It matters because it lets this controller connect to industrial sensors, meters, and control equipment over longer distances than typical hobby serial wiring.
- SCADA
- SCADA means Supervisory Control and Data Acquisition, a type of system used to monitor and control industrial processes from computers or control rooms. SCADA compatibility matters if the controller will be part of a larger automation or monitoring setup.
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Robotics & Motion
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