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.

It works but the 485 driver IC is not rated for 3.3V as advertised. At 3.3V it will work for some random length of time before it stops working and requires a power cycle.

Good price works as advertised.

These are work immediately on Windows 10 and Ubuntu Raspberry PI 4 linux.

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.

These absolutely let me down recently. They are very prone to damage during use. Not sure if hot-plugging them is the problem, but I feel like a well-protected RS-485 transceiver should be okay with that. I had multiple ones fail.

These work great, as advertised

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.

... und macht was es soll.

Ancora una volta queste schede arrivano un po con resistenza R5 e un po senza , con i lettori RS485 Dahua Bassa inpendenza danno problemi senza R5 . Anche con altri fornitori stesso problema .

Used to communicate between two arduino nano, it works only when my serial is at 2900 baud... I don't understand why and it slow down my code a lot..

Just connect it up and off you go. The supplied connector+leads make life easy. I found one of the screws on the blue 485-side connector a bit stiff, almost to the point where I was worried I'd break it, but it has been no trouble. I had it connected to the 3.3V outputs of a Teensy 4.1, so it does work correctly at 3.3V

No guidance document with the product, unable to find anything online. I messaged the supplier and got no response. Product itself looks OK but one star for the zero documentation and no support response offered.