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Compact USB-to-RS485 adapter dongle with black plastic housing and three status LEDs

WaveShare

WaveShare USB to RS485 Converter CH343G 1.2km 300-3Mbps

SKU CH-G4ZM-BXZW7

Industrial USB to RS485 bidirectional converter with CH343G chip, 1.2 km range, 300 bps to 3 Mbps, and onboard TVS, resettable fuse and protection diodes

  • CPU TypeOther
  • Industrial-grade reliability with original CH343G and SP485EEN chips onboard
  • Surge and static protection via TVS, resettable fuse and protection diodes
  • Long-range communication up to 1.2 km at 300 bps to 3 Mbps
  • Wide OS support including Linux, Android, WinCE, Win10, Win11 and legacy Windows
  • Clear status monitoring with three LEDs for power and transceiver activity

Industrial USB to RS485 Converter

This industrial-grade converter uses the original CH343G and SP485EEN chips to translate USB signals into balanced differential RS485 signals. It supports baud rates from 300 bps to 3 Mbps and achieves transmission distances up to 1.2 km. Onboard protection includes a lightningproof tube, resettable fuse, TVS diodes and ESD circuits for stable operation in harsh environments. The device operates across a temperature range of -15 to 70 °C and humidity levels from 5 to 95 % RH.

Embedded Protection and Status Indicators

The built-in TVS suppressor, resettable fuse and protection diodes guard against surge voltage, transient spikes, over-current and over-voltage conditions. These circuits improve shock resistance and ensure reliable data integrity during long-distance runs. Three onboard LEDs provide immediate visual feedback for power, transmit and receive status, simplifying field diagnostics without additional tools. Driver support covers Linux, Android, WinCE and Windows 11 down to XP.

Maximum 1.2 km RS485 Reach

The single specification that determines suitability is the 1.2 km maximum transmission distance at RS485 signalling levels. This range fits large industrial busses, building automation backbones and remote sensor networks where standard USB cables fall short. Buyers needing longer fibre or wireless links, or those requiring galvanic isolation not mentioned in the data, should look elsewhere. The 5 m USB host limit also rules out distant PC placement without active extension.

Highlights

  • Industrial-grade reliability with original CH343G and SP485EEN chips onboard
  • Surge and static protection via TVS, resettable fuse and protection diodes
  • Long-range communication up to 1.2 km at 300 bps to 3 Mbps
  • Wide OS support including Linux, Android, WinCE, Win10, Win11 and legacy Windows
  • Clear status monitoring with three LEDs for power and transceiver activity

Specifications

CPU TypeOther

Questions about this item

Will the resettable fuse or TVS diodes need replacement after a surge event?

The resettable fuse automatically restores operation once the over-current condition clears, and the TVS diodes are non-sacrificial, so neither component requires routine replacement.

At what baud rate does the CH343G chip hit its throughput ceiling on long RS485 runs?

The converter sustains its full 300bps ~ 3Mbps range up to the rated 1.2km distance; the CH343G does not impose a lower ceiling within that span.

How hot does the aluminium case get when the adapter runs continuously at 3 Mbps in a 70 °C ambient?

The unit is rated for -15 ~ 70 °C operating temperature with passive cooling; no active fan or heatsink is fitted, so case temperature will track ambient plus internal dissipation.

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