# Waveshare 2-Channel RS485 UART-RS485 SP3485 module for Raspberry Pi Pico

**URL:** https://aio.lv/en/product--waveshare-wsr-20098--11980591
**Data updated:** 2026-03-11 16:31 (EET)
**Category:** I/O Adapters & Controllers
**Manufacturer:** Waveshare
**Manufacturer code:** WSR-20098
**EAN:** 5904422380144
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 12.49 €
**Prices and availability valid until:** 2026-08-06 23:59
**Price without VAT (21%):** 10.32 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--waveshare-wsr-20098--11980591

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 27.07.2026 | free |
| Pickup points | 30.07.2026 | 1.89 EUR |
| Courier delivery to door | 30.07.2026 | 4.99 EUR |

## Summary description

2-channel RS485 communication module from Waveshare featuring SP3485 transceivers and UART interface, designed for use with Raspberry Pi Pico. Provides two differential RS485 ports for half-duplex serial communication, isolation not specified. Suitable for industrial sensors, multi-node serial networks, and extending Pico serial connectivity over long distances.

## Long description

The Waveshare 2-Channel RS485 UART-RS485 SP3485 module for Raspberry Pi Pico provides two independent half-duplex RS485 ports using SP3485 transceivers and a UART interface compatible with the Pico's serial pins. The module enables differential serial communication over longer distances and in electrically noisy environments by converting UART signals to RS485 differential pairs. Its compact board layout is intended to extend Raspberry Pi Pico projects that require multi-node serial links, sensor networks, or industrial-style wiring.
Advantages
This module offers two RS485 channels on a single board, allowing simultaneous connection of multiple differential serial lines without additional transceivers. The use of SP3485 transceivers ensures TTL-to-RS485 conversion optimized for half-duplex communication. Designed for direct connection to Raspberry Pi Pico UART pins, the module simplifies wiring and integration into existing Pico projects. The board's compact form factor saves space on prototyping setups while providing reliable physical-layer conversion for extended-range serial connections.
Suitable for
Connecting Raspberry Pi Pico to industrial sensors and actuators over RS485.
Building multi-node serial networks such as Modbus RTU or custom protocols on a shared bus.
Extending Pico UART connectivity over long cable runs in noisy environments.
Prototyping systems that require two independent half-duplex RS485 links.
Key specifications
Channels: 2 independent half-duplex RS485 ports.
Transceiver type: SP3485 RS485 transceivers.
Interface to host: UART-level signals compatible with Raspberry Pi Pico serial pins.
Data direction: Automatic or TTL-controlled DE/RE as per board design (drive/receive control available).
Signal type: Differential A/B pairs per channel for RS485 bus connection.
Power supply: Low-voltage logic-compatible supply suitable for Pico (check board silk for exact voltage requirement).
Mounting: Compact PCB suitable for prototyping and small enclosures.
How to use
Connect the module's UART TX/RX pins to the corresponding UART pins on the Raspberry Pi Pico and supply the board with the same logic voltage as the Pico. Terminate the RS485 bus with appropriate resistors at the ends of the cable if required by the network topology. Configure the Pico's UART peripheral for the desired baud rate and parity to match connected RS485 devices. Manage data direction either by using the module's automatic DE/RE control or by toggling the direction control pin from the Pico when deterministic direction control is needed.
Usage recommendations
For reliable RS485 communication, use twisted-pair shielded cable for A/B differential lines, enable proper bus termination at both ends, and ensure a single common reference or ground between nodes when required. Match UART settings across devices and avoid long unterminated stubs. If galvanic isolation is necessary in your application, consider adding an isolated transceiver or isolation stage since the module's isolation is not specified.

## FAQ

### How much does the Waveshare 2-Channel RS485 module for Raspberry Pi Pico cost, and is it available for purchase?

The price is 12.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 17 pcs. are in stock, and you can place your purchase right now with delivery across Latvia and Europe or choose pickup at the Riga collection point. We offer favorable purchase terms, including the option to split the payment into convenient monthly installments. Availability and price are updated in real time, so we recommend placing your order in advance.

### If I order this product today, when will I receive my order?

If you place your order today, delivery will be as fast and convenient as possible. You will be able to pick up your order on 27.07.2026 at the Riga pickup point or choose delivery across Latvia and Europe. We carefully inspect every purchase and pack it securely for safe transportation.

### What payment options are available?

AiO.lv offers several payment methods: Bank transfer, Bank cards on-line, Apple Pay, Google Pay. All transactions are 100% secure and encrypted.

### Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

### What is the warranty period?

All Waveshare products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized Waveshare service centers and through AiO.lv

### Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

### Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. More information about warranty service: https://aio.lv/en/warranty

## Image

https://aio.lv/img/cache/product/11980591/67432353_large.webp