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WSAL19717 – Pico-2CH-RS485/en

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Version vom 6. September 2026, 00:25 Uhr von JWTechPublisher (Diskussion | Beiträge) (Freigegebene technische Dokumentation veröffentlicht; Text-only und noindex)
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Documentation notice: This technical documentation was independently rewritten from an archived supplier source. Check technical details and commands against the product version and manufacturer documentation before use.

Summary

Concise technical reference for the 2-channel RS485 module (SP3485) for Raspberry Pi Pico. It covers specifications, pin mapping, wiring, environment setup, and example code usage.

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Technical overview

  • The module provides two independent UART-to-RS485 channels using SP3485 transceivers.
  • Operating voltage: 3.3 V via the Pico's VSYS pin.
  • Each channel uses dedicated GP pins: Channel 0 uses GP0/GP1, Channel 1 uses GP4/GP5.
  • Baud rate is configurable from 300 to 500,000 bps.
  • Module dimensions: 52.5 mm × 21 mm.
  • Onboard TVS protection guards against surge and transient voltages on the RS485 bus lines.
  • Connection is made through the standard Pico header; observe polarity (align USB-side markings).
  • Example projects in C/C++ and MicroPython are included with the package.

Commands and examples – verify before use:  

sudo apt-get install p7zip-full
cd ~
sudo wget https://files.waveshare.com/upload/9/94/Pico_2CH_RS485.7z
7z x Pico_2CH_RS485.7z -o./Pico_2CH_RS485
cd ~/Pico_2CH_RS485/c/build/
export PICO_SDK_PATH=../../pico-sdk
cmake ..
make -j9
cp main.uf2 /media/pi/RPI-RP2/
sudo apt upgrade thonny

Notes and version constraints

  • The exact firmware version for Pico 2 or RP2350 may vary by package; select the correct .uf2 file before flashing.
  • For first-time Arduino IDE uploads, the UF2 board must be selected first; a COM port then appears afterward.
  • Thonny must be at least version 3.3.3 to support Pico; older versions do not recognize the device.
  • If Arduino IDE installation issues occur: complete uninstallation and manual deletion of the AppData folder is required.
  • RS485 bus wiring (A/B polarity) is not detailed in the source; external bus configuration requires additional verification.

Source and revision record

  • Pico-2CH-RS485 - Waveshare Wiki
  • Source revision: 110232
  • Captured: 2026-09-02T02:45:51+00:00
  • SHA-256: 7f71149754c94f8fe0f88f509c1d598acb531f101f330a45c8114108df879896
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