2 Pack TTL to RS485 Adapter Module 3.3V 5V 485 to TTL Signal Single Chip Serial Port Level Converter Borad with RXD, TXD Indicator

Works great for driving differential RS485 signal from a 3.3-3.7v supply. Unlike many 485 breakouts it does not require an RSE/enable pin; Tx/Rx switching is handled onboard when data is detected on the incoming Tx TTL line, which will save you a microcontroller pin.Screw terminals are good quality. Output common (labeled Earth) is not connected to the board/chip GND, if necessary for your circuit (e.g. DMX) you can bridge the pins with a small wire or ground lift switch.I haven't found a datasheet for the board yet; since this is likely a clone of another design, it doesn't have any identification numbers or name.

They do not work for me like my Waveshare converters. I have connected properly but will not send data to my RS485 to USB converter. When connected to my Teensy 4.1 board I can see the RX led blink on this board but it is not send anything to my USB converter. Wave share to the rescue!

These work great, as advertised

I like the design of the chip. The 4 wire connector is great for development. However, one of the boards I received the board keeps losing it's power connection due to a poor solder connection.

Not good. Outputs are really weak. Might be OK for a point-to-point connection without line termination.Output is disabled (not active) whenever input is high.

I needed a way for 30+ separate devices to communicate to one control system and wireless would have been way to expensive to do this with. One thing to note is that the TX and RX wires are labeled literally meaning do not reverse them on the unit you connect to just connect TX to TX and RX to RX