WSAL21619 – USB TO 4CH TTL/en
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
Technical overview of the Waveshare industrial USB to 4CH TTL converter (item WSAL21619): four independent UART channels based on the CH344 chip, with hardware flow control and support for Windows, Linux, macOS, and Android.
Related products at JW Tech
Technical overview
- The module is an industrial USB-to-TTL converter providing four asynchronous serial ports (UART0–3).
- Each channel exposes TXD, RXD, CTS, and RTS pins, enabling both 3-wire and 5-wire serial communication.
- Hardware flow control via CTSx/RTSx can be enabled or disabled globally through the CFG pin (default: disabled), or configured per channel using the VCP vendor driver.
- Power supply: 5 V; operating current approximately 32 mA.
- Supported baud rate range: 1200 to 460800 bps.
- UART TTL output level: selectable between 3.3 V and 5 V (adjustable).
- Operating temperature range: −40 °C to 85 °C.
- Physical dimensions: 86 mm × 47.8 mm × 27.6 mm.
Commands and examples – verify before use:
ls /dev/tty*
minicom -D /dev/ttyACM0
Notes and version constraints
- The source contains unfilled placeholders such as {{{name2}}} and {{{userDefinedInfo}}}; these values must be manually verified and completed before publication.
- To enable CDC hardware flow control, the CFG pin must be connected to EN – verify exact pinout in the datasheet.
- Installing the VCP driver on Windows requires downloading and installing a vendor driver; on older systems (e.g., Windows 7) a digital signature warning may appear and can be resolved with a driver repair tool.
- Note: inferior knock-offs of this item circulate in the market without testing; provenance and authenticity should be verified before deployment.
Source and revision record
- USB TO 4CH TTL - Waveshare Wiki
- Source revision: 108915
- Captured: 2026-09-03T03:03:38+00:00
- SHA-256:
1ab67bfbaa0498b2b3e028e718a1ecffb358b3ebc9a2599b894e9c14f5b055e3