Features 8 relays and digital inputs for versatile control
Ensures safety with embedded protection circuits
Includes configurable RS485 device addresses
Supports passive and active digital inputs
Facilitates easy installation with rail-mounted design
The Waveshare Industrial Modbus RTU 8-Ch Relay Module w/ Digital Input & RS485 Interface is an advanced industrial relay module designed for robust and reliable control applications. It features eight relay channels and eight digital inputs, all managed via the RS485 bus using the Modbus RTU protocol. This module is equipped with embedded protection circuits, including power isolation, magnetic isolation, and TVS diode protection, ensuring high stability and safety in operation.
The module's design incorporates a rail-mounted ABS plastic enclosure, facilitating easy installation and secure usage. It supports configurable device addresses, allowing multiple devices to be cascaded on the RS485 bus. The relay module also includes a flash-on and flash-off function, enabling timed relay activation. The onboard unibody power supply and magnetic isolation provide stable voltage and signal isolation, enhancing reliability and reducing power consumption.
Additional features include a resettable fuse and TVS for surge and transient voltage protection, optocoupler isolation to prevent interference from high-voltage circuits, and a dedicated relay driver chip with flyback diode protection for enhanced driving capability. The module supports both passive and active digital inputs with bi-directional optocoupler isolation and a built-in debouncing algorithm. Multiple LED indicators provide clear status monitoring of the MCU and signal transmission.
Note: Ensure proper handling to avoid damage from incorrect connections or high-voltage interference.
Digital Input: 8DI, 5 to 36V, passive/active input (NPN or PNP), built-in bi-directional optocoupler isolation
Communication Protocol: Standard Modbus RTU protocol
RS485 Address: 1 to 255
LED Indicators: STA (MCU indicator), TXD (TX indicator), RXD (RX indicator)
Features: Configurable device address, flash-on/flash-off function, onboard unibody power supply isolation, onboard unibody magnetic isolation, onboard resettable fuse and TVS, onboard optocoupler isolation, dedicated relay driver chip, supports passive and active digital input, reverse-proof circuit, high-quality relay, rail-mounted ABS plastic enclosure, multiple LEDs for indicating the MCU status and signal transceiving status
If you are not satisfied with a product purchased from the Site, you may request a return within 30 days from the delivery date, unless the product is listed under the Return Exceptions below or is subject to specific return conditions noted on the product page.
This return policy also applies, as a minimum standard, to products sold and fulfilled by third-party vendors through the Marketplace.
European consumers exercising their statutory Right of Withdrawal are subject to different conditions. See the Statutory Right of Withdrawal.
Returns under this policy concern non-defective products. In the case of a confirmed manufacturing defect, remedies are handled under the Warranty terms, at the Vendor's discretion. See the Warranty section.
Return Conditions
To qualify for a refund under the 30-day return policy, all of the following conditions must be met:
A valid Return Authorization (RA) number must be obtained prior to returning the product. Returns without an RA number will be refused.
The RA number is valid for 30 days. The returned item must be received within that period.
The RA number must be included with the return.
Products must be returned in unused, unmodified condition (e.g., no scratches, alterations, missing parts, or signs of installation/use) and in their original packaging, suitable for resale.
Shipping fees are non-refundable. Return shipping costs are the responsibility of the customer, except in cases of a product confirmed defective through RobotShop's troubleshooting process or of a verified shipping error by RobotShop.
Refunds are processed within 7 days after receipt and inspection of the returned item.
A €100 cleaning fee may apply to domestic robots returned in used or unclean condition.
A 20% restocking fee may apply to large-quantity returns of items ordered specifically for the customer from the manufacturer or not part of RobotShop's standard inventory.
Return Exceptions
The following products are not eligible for return or refund under this policy:
Used, damaged, or modified products — Items that show signs of use, wear, or alteration, making them unsuitable for resale.
Consumables * — Use and wear-and-tear components, altered or depleted through use (e.g., batteries, belts, brushes, gears, filament, tires, disposable bags, lubricants, greases, waxes, etc.). Not eligible for return once opened or used.
Perishables — Goods liable to deteriorate or expire rapidly. Not eligible for return.
Sealed goods (health or hygiene) — Items sealed for health-protection or hygiene reasons (e.g., masks, gloves, odor-absorbing products). Not eligible for return once unsealed.
Build-it-yourself products and items requiring customer assembly * — Including robots & kits, robot parts, and other products requiring assembly or soldering. Not eligible for return once assembled, soldered, or installed.
Digital Goods, Software, and Apps * — Final sale only, due to licensing restrictions.
Clearance Items * — Products identified as clearance or final sale, including end-of-life or discontinued items.
Custom-made, personalized, or special-order items — Products manufactured, configured, adapted, or built to the customer's own specifications and requirements.
On-Demand Items * — Standard catalogue products not stocked by RobotShop and ordered specifically to fulfill a customer request.
* European consumers retain their statutory Right of Withdrawal on these items. Its exercise is subject to the conditions and exclusions set out in the Statutory Right of Withdrawal, and any reimbursement may be reduced to reflect a loss in value resulting from handling beyond inspection.
How to Request a Return Authorization (RA)
While the same return policy applies, these orders require a separate contact process for returns.
Marketplace Vendor Orders → submit a ticket from your account under My Marketplace Tickets to contact the vendor directly.
Note: Marketplace vendor products are normally labelled with SKUs starting with RM, and identified on the product page with the mention "Sold and fulfilled by [Vendor Name]".
