Quelltext der Seite WSAL21440 – CH343 USB UART Board/en

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'''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 CH343 USB UART module converts USB to a serial (TTL) port. It uses the newer CH343G chip, supports data rates from 50 bps up to 6 Mbps and offers selectable TTL levels (5 V / 3.3 V; optionally external 2.5 V / 1.8 V). The module has a 6-pin right-angle pin header on the UART side and connects via mini-, micro-, Type-A or Type-C USB depending on the product variant.

== Related products at JW Tech ==
* [https://shop.jw-tech.eu/p/WSAL21440 WSAL21440 – USB To UART Module, Micro / Mini / Type-A / Type-C Connectors, High Baud Rate Transmission]
* [https://shop.jw-tech.eu/p/WSAL21441 WSAL21441 – USB To UART Module, Micro / Mini / Type-A / Type-C Connectors, High Baud Rate Transmission]
* [https://shop.jw-tech.eu/p/WSAL21442 WSAL21442 – USB To UART Module, Micro / Mini / Type-A / Type-C Connectors, High Baud Rate Transmission]
* [https://shop.jw-tech.eu/p/WSAL21443 WSAL21443 – USB To UART Module, Micro / Mini / Type-A / Type-C Connectors, High Baud Rate Transmission]

== Technical overview ==
* Chip: new version CH343G vs. CH340G; higher data rate up to 6 Mbps and more selectable serial-port IO levels (5 V / 3.3 V / 2.5 V / 1.8 V).
* Interfaces: host side USB (mini/micro/Type-A/Type-C depending on variant), device side UART via 6-pin right-angle pin header.
* Powering: module is powered over USB; onboard jumper selects 5 V or 3.3 V output for external devices.
* Protection circuits: resettable fuse, transient voltage suppressor, IO protection diode against overvoltage, surge and static discharge.
* Operating systems: Windows 7/8/8.1/10/11, macOS, Linux/Raspberry Pi, Android – driver requirements differ per OS.
* UART pin mapping: TXD→MCU.RXD, RXD→MCU.TXD, RTS#→MCU.CTS, CTS#→MCU.RTS plus MODEM contacts RI#, DCD#, DTR#, DSR# (active-low signals).
* Default is software flow control; for hardware flow control connect CFG to EN (CDC mode) or configure in SSCOM (VCP mode).
* Manufacturing process: double-sided black immersion gold plating for durability and appearance.

'''Commands and examples – verify before use:''' 
<syntaxhighlight lang="text">
ls /dev/tty*
sudo apt-get install minicom -y
minicom -D /dev/ttyACM0
</syntaxhighlight>

== Notes and version constraints ==
* Windows driver installation may trigger a digital signature warning; the source mentions a Microsoft bug-fix tool whose availability is not independently confirmed.
* Using 2.5 V or 1.8 V requires external voltage input instead of the jumper; exact connection method is only generally described in the source.
* The source contains placeholders such as &#123;&#123;&#123;name2&#125;&#125;&#125; through &#123;&#123;&#123;name6&#125;&#125;&#125;, &#123;&#123;&#123;userDefinedInfo&#125;&#125;&#125; and &#123;&#123;&#123;5&#125;&#125;&#125; – these are incomplete and need manual completion.
* The phrase 'High Baud Rate Transmission' is marketing language; the actual 6 Mbps rate is specification-based.
* Knock-off warning: the source warns about inferior copies in the market; authenticity verification should be done for non-official stores.

== Source and revision record ==
* [https://www.waveshare.com/wiki/CH343_USB_UART_Board CH343 USB UART Board - Waveshare Wiki]
* Source revision: 108917
* Captured: 2026-09-03T02:51:19+00:00
* SHA-256: <code>ebefdc8315754788f3c5b9c27623b1af319083c03ea04dacc87d32fc0907ff3e</code>