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Small black USB dongle with DB9 port and three status LEDs

WaveShare

WaveShare USB TO RS485 Bidirectional Converter CH343G SP485EEN

SKU CH-0E34-7CGXY

Industrial USB to RS485 bidirectional converter with CH343G and SP485EEN chips, multi-protection circuits, 300 bps to 3 Mbps baud rate and up to 1.2 km transmission distance

  • CPU TypeOther
  • Industrial-grade reliability with original CH343G and SP485EEN chips
  • Surge and ESD protection via TVS, resettable fuse and lightningproof tube
  • Up to 1.2km RS485 transmission at 300bps-3Mbps baudrate
  • Wide OS support including Linux, Android, WinCE, Win11/10/8.1/8/7/XP
  • Operates from -15°C to 70°C with 5%RH-95%RH humidity tolerance

Industrial USB to RS485 Converter

The WaveShare converter uses an onboard CH343G and SP485EEN chipset to translate USB data into balanced differential RS485 signals. It supports baud rates from 300bps up to 3Mbps and enables reliable communication over distances up to 1.2km. The module draws power directly from the USB 5V supply and includes three status LEDs for power and transceiver activity. It is compatible with Windows XP through 11, Linux, Android and WinCE systems.

Suited for long-range industrial links

Engineers integrating sensors, PLCs or automation equipment across factory floors or outdoor sites will benefit from the extended reach and noise immunity of RS485. Built-in TVS diodes, a resettable fuse and protection diodes guard the host port against surges, ESD and over-current events. The design is not intended for short-range desktop peripherals or high-speed bulk endpoints that require USB 3.0 throughput. Users needing galvanic isolation or fibre-optic extension should evaluate dedicated isolators instead.

Stable under continuous industrial duty

The protection circuitry maintains consistent voltage and current levels during prolonged transmission sessions at high baud rates. Operating temperature range spans -15 to 70 degrees Celsius with humidity tolerance from 5% to 95% RH, allowing deployment in harsh cabinets or outdoor enclosures. Sustained differential signalling resists common-mode noise better than single-ended links, so data integrity holds over the full 1.2km span without the error bursts seen on unprotected lines.

Highlights

  • Industrial-grade reliability with original CH343G and SP485EEN chips
  • Surge and ESD protection via TVS, resettable fuse and lightningproof tube
  • Up to 1.2km RS485 transmission at 300bps-3Mbps baudrate
  • Wide OS support including Linux, Android, WinCE, Win11/10/8.1/8/7/XP
  • Operates from -15°C to 70°C with 5%RH-95%RH humidity tolerance

Specifications

CPU TypeOther

Questions about this item

What type of USB port does my computer need for this converter?

The converter plugs into any standard USB-A port and draws 5 V from it.

Can this converter share a multi-drop RS-485 bus with legacy 300 bps devices?

Yes, the supported baud range is 300 bps to 3 Mbps, so slower nodes can coexist on the same bus.

Which LED pattern confirms the CH343G is powered and communicating?

The three onboard LEDs show power, transmit and receive activity; steady power LED plus flashing TX/RX LEDs means the link is live.

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