Waveshare 24921 Modbus RTU 16-Ch Relay Module, RS485 Interface, With Multiple Isolation Protection Circuits
Waveshare 24921 Modbus RTU 16-Ch Relay Module, RS485 Interface, With Multiple Isolation Protection Circuits
Spread the cost
No lump sum. No stress. Pick a repayment term that works for your budget — and keep your cash flow intact.
- R453.86/mo 3 months
- R229.5/mo 6 months
- R121.12/mo 12 months
- From R453.86/month over 3 months, or as low as R121.12/month over 12. Total repayable over 12 months: R1453.44. Interest at 20.75% p.a. applies.
- Quick online application — most people get a decision within minutes. Your first payment only kicks in 30 days after you buy.
- Mobicred is a registered South African credit provider (NCR reg. NCRCP7852). Available to SA residents aged 18+ with a valid ID and bank account.
At checkout, simply select Mobicred as your payment method.
Continue to checkoutDon't have Mobicred yet? Apply free — takes about 2 minutes →
Mobicred is a revolving credit facility provided by Retail Capital (Pty) Ltd, a registered credit provider (NCR reg. NCRCP7852) in terms of the National Credit Act 34 of 2005. Credit is subject to approval and an affordability assessment. Interest rate: 20.75% p.a. compounded monthly (1.7292%/month). Available to South African residents aged 18 and older. Full terms & conditions apply.
Import Taxes Included
Read shipping & tax policy ›This product is priced for DDP import handling. KifTech handles applicable import costs before delivery:
- Import duties – Included where applicable
- Customs fees – Handled before delivery
- Shipping – Free on orders over R750. R49 standard rate below R750.
✓ The checkout total shows the product and shipping amount you pay to KifTech. No separate import duty payment should be required on delivery.
Free Shipping over R750
R49 below R750. Taxes included. Read policy ›
Estimated Arrival
8–17 business days after order placement.
Delivery Timeline
Order Processing (0–3 days)
Order verified and dispatched. Tracking details provided by email.
Transit (8–14 business days)
Package is shipped internationally to South Africa via Buffalo Logistics.
30-day refund / replacement
Read full return policy ›Shipping Protection
Read full policy ›Encrypted Checkout
Read privacy policy ›Checkout uses encrypted payment processing to help protect your personal and payment details.
Accepted via PayFast:
Product Overview
Features:
1. This product is an industrial-grade 16-channel relay module controlled by RS485 bus, using Modbus RTU protocol, built-in power isolation, ADI magnetic isolation, resettable fuse, TVS diode and other protection circuits, and equipped with ABS case.
2. Modbus RTU 16 channel relay is very easy to use. Due to its fast communication speed, stability, reliability and security, it is ideal for industrial control equipment and/or applications with high communication requirements.
3. Configurable device address (1-255), multiple devices can be cascaded on the RS485 bus
4. It has the function of blinking and blinking. By passing parameters to the command, the relay can be opened for a period of time and then automatically closed
5. On-board integrated power isolation, providing stable isolation voltage, no additional power supply is required at the isolation end
6. Onboard integrated ADI magnetic isolation, which can realize signal isolation, high reliability, strong anti-interference and low power consumption
7. Onboard resettable fuse and TVS (transient voltage suppressor), effectively suppress surge voltage and transient peak voltage in the circuit, provide overcurrent/overvoltage, lightning protection, anti-static
8. On-board optocoupler isolation to prevent the relay from being interfered by the high-voltage circuit
9. On-board dedicated relay driver chip, built-in freewheeling diode protection, stronger and more stable driving capability
10. Anti-reverse connection circuit to prevent accidental damage to the circuit by wrong connection
11. High quality relay, contact rating: ≤10A 250VAC/30VDC
12. Rail-type ABS shell, easy to install and safe to use
13. There are 3 LEDs for indicating MCU status and signal sending and receiving status
Product parameters:
1. Working voltage: 5V
2. Communication interface: RS485
3. Baud rate: 4800, 9600, 19200, 38400, 57600, 115200, 128000, 256000
4. Default communication format: 9600, N, 8, 1
5. Relay channel: 16
6. Contact information: 1NO 1NC
7. Communication protocol: standard Modbus RTU protocol
8. RS485 address: 1-255
9. LED indicator light:
STA: MCU indicator light, it keeps flashing when the MCU is working normally
TXD: TX indicator light, lights up when sending data
RXD: RX indicator light, lights up when receiving data
Packing list:
-Modbus RTU relay 16CH x1
-US Plug 5V 2A power supply (with EU head adapter) x1
Product checks
Check fit before you buy
Review model, version, connector, size, photos, specifications, and package contents before checkout.
Compatibility checklist
- Match the exact product, device, model, size, colour, and variant shown in this listing.
- Brand names are used to identify compatibility unless the listing clearly states otherwise.
- For straps, cases, holders, covers, and accessories, check the size and compatible model before ordering.
- For powered products, check voltage, wattage, current, connector type, charger compatibility, and plug type before use.
Have questions about this product? Need help choosing? Contact our support team for assistance!
