Galvanic Isolation, Self-Powered: Digital isolator breaks USB-CAN signal path. Onboard DC-DC supplies isolated 5V and GND to CAN side—no external supply needed. Eliminates ground loops; bus faults stay on bus. Pin 3 is isolated GND—do not tie to PC GND. Open Source Hardware, Published: We publish our designs back. Full schematic & PCB layout on GitHub (dsdtech-official) as editable files under CERN-OHL-S-2.0, plus firmware. All claims verifiable in schematic. CAN FD at Full Speed, Out of Box: No reflash, serial port, or mode switch. Factory build runs CAN FD over gs_usb like classic CAN, up to 5Mbit/s with 64-byte frames. Same MCU/firmware as SH-C31A, tested with isolation. Units from Sep 2026 ship with v1.4. Built for a Real Bus: 4-pin 5.0mm screw terminal—CAN_L, CAN_H, isolated GND, isolated +5V (can power a small node). Built-in 120Ω termination switch (disable if bus already has two). Each CAN line has resettable fuse & TVS clamp; USB side has its own protection.
We'd like to share an important update: Our SH-C31G has officially been open-sourced on GitHub.
This project is licensed under the CERN-OHL-S-2.0 license (a strong, reciprocal open-source license that allows commercial use but requires derivative works to be released under the same license). You can access the full source code at the following link. We welcome you to try it out and provide your valuable feedback.
GitHub link:https://github.com/dsdtech-official/can-adapters/tree/main/SH-C31G
Technical Support & File
Built-in candlelight firmware at the factory. In this firmware mode, the SH-C31G does not support CAN FD framing.
If you need to use the CAN FD function, please flash the firmware to slcan firmware.
Specification
Model SH-C31G
Standard: CAN BUS
Main Chip: SIT1051T
Interface: USB Type B, 4-pin terminal block
Based on CANable 2.0
Supports CAN FD (higher speed)
Supports CAN2.0A and B with baud rates up to 1M
Compatible with socketcan via slcand
Simple cross-platform Python library
Isolated version
Packing List
1 X SH-C31G USB to CAN Adapter
1 X User Manual
1 X USB Type B Cable(1M/3.2FT)
We'd like to share an important update: Our SH-C31G has officially been open-sourced on GitHub.
This project is licensed under the CERN-OHL-S-2.0 license (a strong, reciprocal open-source license that allows commercial use but requires derivative works to be released under the same license). You can access the full source code at the following link. We welcome you to try it out and provide your valuable feedback.
GitHub link:https://github.com/dsdtech-official/can-adapters/tree/main/SH-C31G
Technical Support & File
Built-in candlelight firmware at the factory. In this firmware mode, the SH-C31G does not support CAN FD framing.
If you need to use the CAN FD function, please flash the firmware to slcan firmware.
Specification
Model SH-C31G
Standard: CAN BUS
Main Chip: SIT1051T
Interface: USB Type B, 4-pin terminal block
Based on CANable 2.0
Supports CAN FD (higher speed)
Supports CAN2.0A and B with baud rates up to 1M
Compatible with socketcan via slcand
Simple cross-platform Python library
Isolated version
Packing List
1 X SH-C31G USB to CAN Adapter
1 X User Manual
1 X USB Type B Cable(1M/3.2FT)
