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Small silver metal box with USB port and four terminal blocks, ten indicator LEDs and a DIP switch, wall-mount tabs visible

WaveShare

WaveShare Industrial Isolated USB to 4-Ch RS485 Converter (B) 2 in 1 accessory

SKU CH-9NTN-MXKY8

Connects four isolated RS485 channels over USB with built-in surge protection, DIP-switch termination and ten status LEDs

  • Fast, stable communication with original CH344L chip
  • Expand four industrial RS485 devices from one USB port
  • Built-in power isolation needs no extra supply
  • TVS, fuse and diodes protect against surges and over-current
  • Ten LEDs show power, configuration and data activity

Industrial 4-channel RS485 converter

The WaveShare converter uses a CH344L chip to add four isolated RS485 ports over a single USB connection. It targets engineers and integrators who need reliable serial links for automation, metering or sensor networks. The board requires no external power for the isolated side, simplifying cabinet wiring.

Isolation and protection features

Onboard unibody power and digital isolation remove ground-loop noise and protect the host from transients. A TVS array, self-recovery fuse and protection diodes guard each channel against surges and over-current events. DIP-switchable 120R termination resistors let you match the bus without extra parts.

Metal enclosure and mounting

An aluminium alloy case shields the electronics and supports both wall-mount and DIN-rail installation. Ten status LEDs show power, configuration and per-channel transmit/receive activity at a glance. The rugged housing suits cabinets and field enclosures where plastic dongles would not survive.

Highlights

  • Fast, stable communication with original CH344L chip
  • Expand four industrial RS485 devices from one USB port
  • Built-in power isolation needs no extra supply
  • TVS, fuse and diodes protect against surges and over-current
  • Ten LEDs show power, configuration and data activity

Specifications

No published specifications for this item yet.

Questions about this item

How often should the TVS diodes and self-recovery fuse be inspected or replaced?

The onboard TVS diodes and self-recovery fuse are designed for continuous industrial operation and do not have a scheduled replacement interval; they activate automatically during surge or over-current events and reset once the fault clears.

What limits sustained communication across all four RS485 channels?

The CH344L chip manages four isolated RS485 channels simultaneously, so total aggregate throughput and the 120R termination setting on each channel are the practical limits during continuous use.

How much heat does the aluminium case dissipate when all four channels run all day?

The unibody power and digital isolation runs at low power consumption, and the industrial-grade aluminium alloy case passively dissipates the resulting heat without requiring active cooling.

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