ESP8266 Community Forum

- Tue Mar 10, 2020 4:40 am #86011 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

1 (Phone).png

- 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

image (Phone).png

- https://ibb.co/XsqvLjr

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

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- Tue Mar 10, 2020 12:15 pm #86015 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.