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Right.
Thing is that I don't know how the end user of this will use it. Hopefully will be a PLC or another controller with more sofisticated transceiver.
But should be prepare to work with this "Poor Mans" USB-485.
Anyway, first time working with RS-485.
Thanks!
Hi.
I tryed combination 220R | 150R | 220R. This allowed to elevate average value for difference A-B approx 400mV and still have an equivalent Rab = 110ohm. USB-485 works fine with this.
However, I think I going to change in my design MAX3485 to MAX3072E wich has true fail-safe implemented...
Hi.
This is great! I tried what @FvM suggest as first possible solution. Connecting two 100ohms resistors (pull-up channel A + pull-down channel B) does the trick.
However, line seems a little bit unbalanced. I attached capture of oscilloscope and new scheme (sorry for the lazy scheme).
1) When...
Hi there!
This it my first post so thank you in advance for your time!
I made a PCB with uC with UART wich I connect to a MAX3485 (3.3V supply). To test it, I tried to comunicate the uC with other devices successfully:
1) ESP32 with external MAX3485 (3.3 levels)
2) ESP32 with external MAX485...
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