The SH-C31A is derived from the open source hardware project Canable 2.0, which differs from other commercial USB CAN products in that all the information (schematics, BOM list, Gerb files) is publicly available on the . Also, if you are not satisfied with the default firmware, you have the option to swipe in other firmware to be compatible with software such as PCAN etc.
Notes:
Built-in candlelight firmware at the factory. In this firmware mode, the SH-C31A cannot support CAN FD frames. If you need to use the CAN FD function, flash the firmware to slcan firmware.
Specification:
Model: SH-C31A
Standard : CAN BUS
Main chip: SIT1051T
Interface: USB Type A ,4 PIN Terminal Block
Based on Canable 2.0
Supports CAN FD (higher speed)
Supports CAN2.0A and B, baud rates up to 1M
Compatible with socketcan through slcand
Simple cross-platform Python library
Packing list:
1 X SH-C31A USB to CAN Adapter
1 X User manual: focuses on the development of communication connection devices such as USB/Serial/Wireless. We have served more than 100,000 customers in Europe, North America and Japan.
Open Source Hardware, Actually Published: We do not only build on open hardware — we publish our own design back. The full schematic and PCB layout for this exact board are on our GitHub (dsdtech-official) as editable design files, not pictures, under the CERN-OHL-S-2.0 licence, together with the firmware images. Every claim above is in that schematic. Go and check it.
Based on CANable 2.0, Hardened for the Field: An enclosure instead of a bare board, and protection the reference design leaves out — a resettable fuse in series with CAN_H and with CAN_L, and TVS clamping on both. A 120 ohm termination switch is built in, and the bus lands on a 3.81 mm screw terminal rather than a header.
CAN FD Works Out of the Box: No second firmware, no serial port, no reflashing — the candleLight firmware fitted at the factory carries CAN FD over the same interface as classic CAN. Measured on this board: 64-byte FD frames at 5 Mbit/s data rate, offerirectional for 75 minutes, zero frames lost and zero bus errors. Units produced from September 2026 ship with our current build, v1.4.
Support That Does Not Stop at the Sale: Permanent technical support, 1-year , and an answer within 1 working day. Questions can also go in the open issue tracker on our GitHub, where the answer stays readable for the next person — next to the wiring, termination and firmware guides.
