The Waveshare CH343 USB adapter supports baud rates up to 6 Mbps, making it one of the fastest USB-serial bridges available.
Table of Contents
Specs
- WCH CH343 chip, up to 6 Mbps
- Full modem signals (RTS, CTS, DTR, DSR)
- USB 2.0 Full Speed
- 3.3V and 5V logic levels
Recommended: Waveshare Industrial USB TO TTL Serial Cable
Setup
Linux kernel 5.x+ has built-in CH343 driver. Appears as /dev/ttyACM0. For older kernels, install ch343 module.
CH343 vs CH340 vs FT232
| Feature | CH343 | CH340 | FT232 |
|---|---|---|---|
| Max baud | 6 Mbps | 2 Mbps | 3 Mbps |
| Driver | Built-in (5.x+) | Built-in | Built-in |
| Price | Medium | Low | High |
Recommended: Waveshare ESP32-S3-Nano Development Board
Use Cases
- High-speed data logging from sensors
- Firmware upload to fast-UART devices
- Industrial equipment with high baud rates
- Debug output from high-frequency data streams
Frequently Asked Questions
When do I need 6 Mbps?
High-speed sensor data streams, fast firmware uploads, and industrial protocols above 1 Mbps.
Backwards compatible?
Yes, works at any standard baud rate (9600, 115200, etc.).
Linux driver issues?
Kernel 5.x+ has built-in support. Older kernels need manual driver install from WCH.
Can I use for Arduino?
Yes, any serial device. Connect TX/RX/GND as usual.
Conclusion
The CH343 adapter fills the gap when standard serial adapters are too slow. Essential for high-speed embedded debugging.
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