$36.99reference price
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Installations with no outlet near the panel (it's powered via PoE) that need to bridge old or new RS232/485/422 to an Ethernet network.
It's a "translator" that connects equipment with old serial cables (RS232, RS485, RS422 — the language industrial machines speak to each other) to your regular internet network (Ethernet), so you can monitor or control them from a computer elsewhere in the building. PoE means a single network cable carries both the data and the power, with no outlet needed nearby.
If you have a solar panel or battery system with an RS485 output and want to monitor it from your computer without running a power outlet out there, PoE solves the power problem.
A plant with old machines that use RS232 ports (older measuring instruments) can connect them to the factory's modern network without replacing the equipment, and without needing power near the panel thanks to PoE.
Compared to running new power cable out to a panel with no outlet nearby, PoE saves you that job — and supporting all three serial protocols on one device avoids buying three separate gateways if your installation is mixed.
Single-phase input to 220V three-phase output — the typical choice for workshops without a three-phase feed that want to run a 3-phase motor. This is an entry-level model (2HP/1.5kW), meant for spindles and small CNC motors, not large industrial loads. The output range up to 3000Hz is only useful if your specific spindle takes advantage of it — for a standard 60Hz motor it's irrelevant.
Has vector control (not just scalar V/F), which holds torque better at low RPM — important if you'll be threading or cutting at reduced speed. At 5HP/4kW it covers larger motors than the entry-level model, and accepts both single-phase and three-phase input, giving flexibility depending on the electrical setup available. Rated up to 26A — confirm your wiring and breakers can handle that current before installing.
Unlike the RS232/485/422-to-Ethernet gateway already in this ranking, this is a simple USB-to-RS485 converter — it plugs directly into a PC/laptop's USB port to configure, program, or monitor an RS485 bus from a computer, not to bridge to an Ethernet network. Uses the FT232RL chipset (a recognized one, not a generic clone) plus an SP485EEN transceiver, with real overvoltage (TVS) and ESD protection — something cheaper options of this type often skip. Comes as 2 units, useful if you need one for the shop and one as a spare.