JWTechPublisher: Freigegebene technische Dokumentation veröffentlicht; Text-only und noindex

2026-09-06T06:06:36Z

Freigegebene technische Dokumentation veröffentlicht; Text-only und noindex

Neue Seite

__NOINDEX__
'''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 ==
The Waveshare RS485 CAN HAT (B) adds two RS485 channels and one CAN channel to a Raspberry Pi via SPI. It supports an external power supply of 8–28 V and provides signal and power isolation plus TVS, overcurrent, and overvoltage protection.

== Related products at JW Tech ==
* [https://shop.jw-tech.eu/p/WSAL23227 WSAL23227 – Isolated RS485 CAN HAT (B) For Raspberry Pi, 2-Ch RS485 and 1-Ch CAN, Multi Protections]

== Technical overview ==
* Uses the standard Raspberry Pi 40-pin GPIO expansion header and is compatible with the Raspberry Pi series.
* CAN function: MCP2515 CAN controller and SN65HVD230 CAN transceiver; converts SPI to CAN.
* RS485 function: SC16IS752 + SP3485 dual-chip combination; converts SPI to RS485 with data rates up to 921600 baud.
* External power supply via screw terminals or through the Raspberry Pi; voltage range DC 8–28 V.
* Integrated power isolation provides a stable isolated voltage without requiring additional supply on the isolated side.
* Digital signal isolation offers high reliability, strong interference immunity, and low power consumption.
* TVS suppresses surge voltages and transient spikes; lightning-proof and anti-static.
* Auto-recovery fuse and protection diodes ensure stable output levels and provide overcurrent/overvoltage protection.
* 120 Ω terminal resistor, enabled by jumper cap settings.
* Can be wired via onboard terminals or pin headers for convenient wiring.
* Breakout SPI control pins are provided for connecting with host control boards.

'''Commands and examples – verify before use:'''
<syntaxhighlight lang="text">
sudo wget http://www.airspayce.com/mikem/bcm2835/bcm2835-1.71.tar.gz
sudo tar zxvf bcm2835-1.71.tar.gz
cd bcm2835-1.71/
sudo ./configure && sudo make && sudo make check && sudo make install
sudo apt-get install wiringpi
wget https://files.waveshare.com/wiki/common/wiringpi-latest.deb
sudo dpkg -i wiringpi-latest.deb
gpio -v
sudo git clone https://github.com/WiringPi/WiringPi
cd WiringPi
sudo ./build
sudo python main.py
</syntaxhighlight>

== Notes and version constraints ==
* On Bookworm systems only the lgpio library is available; bcm2835 and wiringPi cannot be installed or used.
* The Python library does not need separate installation; the demo can be run directly.
* If default pin assignments conflict with other devices, back-side solder joints can be changed to use different pins.
* When testing the Modbus RTU relay, the serial port number in the program must be adjusted accordingly.
* For Ubuntu systems, the config.txt file is usually located in the /boot/firmware folder.
* If library installation issues occur on Raspberry Pi 5, you can create a virtual Python environment or install rpi.gpio.

== Source and revision record ==
* [https://www.waveshare.com/wiki/RS485_CAN_HAT_(B) RS485 CAN HAT (B) - Waveshare Wiki]
* Source revision: 90973
* Captured: 2026-09-04T02:42:35+00:00
* SHA-256: <code>7a2cad322e4ae0c4271fd2726cd868c0f76896696f62f1ad162c0a0f9b2577c7</code>

WSAL23227 – RS485 CAN HAT (B)/en - Versionsgeschichte

JWTechPublisher: Freigegebene technische Dokumentation veröffentlicht; Text-only und noindex