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#14 in Industrial Control (B2B)
waveshare 4-Ch RS485 to Ethernet RJ45 Serial Server
Industrial Control (B2B)

waveshare 4-Ch RS485 to Ethernet RJ45 Serial Server

4.7(15 reviews)

$64.99reference price

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Best for

Monitoring or controlling 4 independent RS485 buses from a single Ethernet network, in installations where PoE isn't needed.

  • 4x independent RS485
  • Ethernet/RJ45
  • Modbus/MQTT gateway

What is it and what's it for?

It's a gateway (translator) similar to the RS232/485/422 one in this ranking, but specialized: instead of translating a single bus, it handles 4 fully independent RS485 buses at once from a single network connection — like having 4 separate phone lines that don't interfere with each other, all going out over the same internet cable.

Real-world use cases

At home

A hobbyist with several separate RS485 systems at home (solar panels, irrigation sensors, DIY home automation) can monitor all 4 from a single network, without the data mixing up.

In a business or workshop

A plant with 4 production lines, each with its own RS485 bus, can centralize them at a single network point without one line's traffic interfering with the others.

How to avoid buying the wrong one

  • Unlike the single-port gateway in this ranking, this one doesn't include PoE power — you'll need a separate power supply.
  • Combines several functions (Modbus gateway, MQTT gateway, RS485 to JSON) — confirm which one you actually need before configuring it.
  • Has few reviews (15) for the price — it's a more technical purchase, without much track record from other buyers yet.

The investment takeaway

If you have several RS485 buses you need to keep separate (so one's traffic doesn't mix with another's), this device saves you from buying 4 separate gateways — an investment that pays off in simpler installation and fewer cables running through the plant.

waveshare 4-Ch RS485 to Ethernet RJ45 Serial Server

$64.99reference price

See current price on Amazon

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