2PCS Waveshare Industrial USB to RS485 Converter with Original FT232RL and SP485EEN Embedded Protection Circuits for Industrial Control Equipments and/or Applications

These work, they last a long time in tough environments, and the price delivers a lot of value.

These worked perfectly for my project. Well made.

I've had it for several months and I'm 100% satisfied.

Used this for bas systems integration for bacnet mstp to serial for ciper30. I also intend to try to go straight to a local workstation to do pre programming

This review is for 2PCS Waveshare Industrial USB to RS485 Converter with Original FT232RL and SP485EEN Embedded Protection Circuits for Industrial Control Equipments and/or ApplicationsThe kit includes a pair of RS-485<->USB converters, 2 USB A Male ->USB A Female extender cables. The extenders may be needed because the transceivers are somewhat thicker and wider than is typical for USB devices, which may obstruct adjacent ports. The RS-485 connections are made on a three pin screw terminal block containing the A, B and GND signals. Two small screwdrivers are provided for the blocks.RS-485 is very effective in spanning long distances at high speeds. The usual formula is length is meters * speed in baud <= 10**8. Thus, 2Mbps could be used at 500 meters. These transceivers are protected against induced common mode currents, such as might occur from static caused by wind blowing over the wires or distant lightning strikes. They will not protect against direct or nearby lightning strikes - additional protection should be provided.I tested these at speeds from 115,200 baud up to 2,000,000 baud using a pair of minicom sessions under Linux. The devices appear as USB serial ports, due to their FTDI UART<->USB converter. Monitored the A and B signals at various speeds on a 500MHz oscilloscope.. The rise/fall times were fairly fast, 4 ns at 2,000,000 baud, and the signals were inverted with respect to each other, as expected. I did notice a small glitch in both edges of the A signal at higher baud rates, but that had no effect on communications and could have been made worse by my testing setup.I used one of these to talk to a Davis weather station through about 25M of cable and it received the telemetry without any errors, even in the presence of a 1.5KW RF signal on 7 MHz with the antenna 10M away from the RS-485 cable.Overall, these devices do exactly what they say and will be useful for long distance communications in electrically noisy environments. Recommended.

It's nice to be able to plug into the USB and get the comms on the RS485 network I have at home.My home has a couple PLCs and more than a few devices that are generally connected over an RS485 bus. It's nice to get diagnostic info directly on the laptop when I go to troubleshoot some of these devices.This is handy, I don't have to build my own, and it's easy to use.If you're in the market for something like this, you already know, probably, why you need it. This makes it easy to do.Nice touch including the USB cable extensions as well. Don't really need the screwdrivers, but always good to have extras.