ESP8266 Community Forum

Hello,

It may be trivial to her, but I still find myself in trouble in this area. I'm trying to read the data from an M-Bus flowmeter, after many tests and hairs I decided to put a signal analyzer on Tx and Rx immediately after power
Rx = D0 & Tx = D1

- https://ibb.co/c3nZTKp

And if I connect the same flow meter through the same converter but
not with the ESP8266, I connect to USB TTL everything is fine

- https://ibb.co/XsqvLjr

Are there any ideas why and how this problem can be solved

Idea why it is? Yes - it's (probably) residual from boot-up message, sent by ROM bootloader @78800Bd. How to solve it? Swap the serial port pins to the alternate GPIOs and use this pins for your M-bus transceiver.