Teyleten Robot USB to RS485 485 Converter Adapter CH340T Chip 64-bit Suitable for Windows 7/8 MacOS WinCE5.0 XP(Pack of 3)

Very economical and works well to read Growatt SPF 3000TL data from raspberry pi.Here is the code to use for raspberry pi 3. You will need to install pymodbus and pyserial packages.#!/usr/bin/env python3# -*- coding: utf-8 -*-from pymodbus.client.sync import ModbusSerialClient as ModbusClientclass Inverter(object): def __init__(self, address, port): self._inv = ModbusClient(method='rtu', port=port, baudrate=9600, stopbits=1, parity='N', bytesize=8, timeout=1) self._unit = address self.inputRegs = [] self.holdRegs = [] if self._inv.connect(): self.inputRegs = self._inv.read_input_registers(0, 83, unit=self._unit).registers self.holdRegs = self._inv.read_holding_registers(0, 80, unit=self._unit).registers self._inv.close() else: print('Error connecting to port')# end of Inverter Class# initialize inverter object with slave addr=0x1# usb0 on raspberry pi is RS485 to usb dongleinv = Inverter(0x1, '/dev/ttyUSB0')print("Status:"+str(inv.inputRegs[0]))print("Bat voltage:"+str(inv.inputRegs[17]/100)+"v")print("Bat soc:"+str(inv.inputRegs[18])+"%")~

I am using several of these to interface with JBD/Overkill Solar BMSs, as well as an EPEVER MPPT charge controller. They work well right out of the box under Linux, and both work better than the manufacturer-supplied RS485 solutions. The JBD dongle would drop packets here and there, while I could not get the EPEVER dongle to work at all with their software (Running under both WINE and a Windows VM, which may well be the issue).I am using these with custom python scripts now to harvest the data and display it via Grafana. Very cool solution.

These units are exactly what I expected for the price. Super cheaply constructed but functional. The shell is press fit together with plastic pins, so be gentle with it. Also, the USB port ground shell pins are not folded over or soldered to the board, meaning the surface mount USB data/power pins are the only thing holding the USB port to the board. I would highly recommend opening them up, folding the ground pins around the PCB, and soldering them down, which makes for a much sturdier device. Otherwise, works great for what I needed them for.

Use them on a raspberry pi to interface with my battery bms. These do just fine.

Said couldn't read the port. Maybe it needs some drivers, but there are plenty of other options that are plug and play.

One of these works fine on Windows 10, as expected; the other one is dead and does not even show up at all in Device Manager when plugged in.I guess you can't expect too much at that price. At least one of them works (for now)!

I installed this in a Tesla wall charger, as part of a DIY project to charge my car from excess solar power. These cheaper serial adapters have a reputation for dying randomly after a month or so of use. Mine's been operating trouble free for several months now. It was effortless to set up on Raspbian - no drivers needed, and totally standard behavior. So far so good!

These do work, but when looking at the signal on an o'scope, these are by far the worst of 3 different 485 adaptors that I have tried.