https://wiki.jw-tech.eu/index.php?action=history&feed=atom&title=WSAL19717_%E2%80%93_Pico-2CH-RS485%2FenWSAL19717 – Pico-2CH-RS485/en - Versionsgeschichte2026-10-23T21:59:21ZVersionsgeschichte dieser Seite in JW Tech WikiMediaWiki 1.43.9https://wiki.jw-tech.eu/index.php?title=WSAL19717_%E2%80%93_Pico-2CH-RS485/en&diff=1212&oldid=prevJWTechPublisher: Freigegebene technische Dokumentation veröffentlicht; Text-only und noindex2026-09-05T22:25:17Z<p>Freigegebene technische Dokumentation veröffentlicht; Text-only und noindex</p>
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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.<br />
<br />
== Summary ==<br />
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.<br />
<br />
== Related products at JW Tech ==<br />
* [https://shop.jw-tech.eu/p/WSAL19717 WSAL19717 – 2-Channel RS485 Module for Raspberry Pi Pico, SP3485 Transceiver, UART To RS485]<br />
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== Technical overview ==<br />
* The module provides two independent UART-to-RS485 channels using SP3485 transceivers.<br />
* Operating voltage: 3.3 V via the Pico's VSYS pin.<br />
* Each channel uses dedicated GP pins: Channel 0 uses GP0/GP1, Channel 1 uses GP4/GP5.<br />
* Baud rate is configurable from 300 to 500,000 bps.<br />
* Module dimensions: 52.5 mm × 21 mm.<br />
* Onboard TVS protection guards against surge and transient voltages on the RS485 bus lines.<br />
* Connection is made through the standard Pico header; observe polarity (align USB-side markings).<br />
* Example projects in C/C++ and MicroPython are included with the package.<br />
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'''Commands and examples – verify before use:''' <br />
<syntaxhighlight lang="text"><br />
sudo apt-get install p7zip-full<br />
cd ~<br />
sudo wget https://files.waveshare.com/upload/9/94/Pico_2CH_RS485.7z<br />
7z x Pico_2CH_RS485.7z -o./Pico_2CH_RS485<br />
cd ~/Pico_2CH_RS485/c/build/<br />
export PICO_SDK_PATH=../../pico-sdk<br />
cmake ..<br />
make -j9<br />
cp main.uf2 /media/pi/RPI-RP2/<br />
sudo apt upgrade thonny<br />
</syntaxhighlight><br />
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== Notes and version constraints ==<br />
* The exact firmware version for Pico 2 or RP2350 may vary by package; select the correct .uf2 file before flashing.<br />
* For first-time Arduino IDE uploads, the UF2 board must be selected first; a COM port then appears afterward.<br />
* Thonny must be at least version 3.3.3 to support Pico; older versions do not recognize the device.<br />
* If Arduino IDE installation issues occur: complete uninstallation and manual deletion of the AppData folder is required.<br />
* RS485 bus wiring (A/B polarity) is not detailed in the source; external bus configuration requires additional verification.<br />
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== Source and revision record ==<br />
* [https://www.waveshare.com/wiki/Pico-2CH-RS485 Pico-2CH-RS485 - Waveshare Wiki]<br />
* Source revision: 110232<br />
* Captured: 2026-09-02T02:45:51+00:00<br />
* SHA-256: <code>7f71149754c94f8fe0f88f509c1d598acb531f101f330a45c8114108df879896</code></div>JWTechPublisher