How to interface ESP32 with RS485 (Modbus) sensors with example code

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In this video, we showed how we can interface ESP32 to any RS485 Modbus RTU based sensors using Arduino IDE. We created an example project by interfacing an RS485 Modbus protocol-based energy meter (DDM18SD) using MAX485 (TTL to RS485) IC and collecting current, voltage, and frequency data from the energy meter.

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Комментарии
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Hello, In My serial monitor it is error code E1. Please advise me.

h.thawatchai
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Why the parameters return just "0, 00". The energy meter read voltage, currente and frequency but in the serial monitor read just 0, 00

AdelinoMotahotmail
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ESP32 pins are not TTL, they are 3.3v how did you connect the rs485?

IsaacBG
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Hello, I am developing a project with the energy meter TAC1100 from TAIYEDQ I'm using the ESP32 from LILYGO TTGO T-PCIE and MAX485 from but it is giving an error " Failed, Response Code: E2"
I'm using the same pins referenced in the project and the TAC1100 configuration is:
ID 14
BD 9600
Party Even

AdelinoMotahotmail
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Hi there! Can you please share the source for the sketch you're running in this video? Your example on your plog post doesn't work at all and I noticed it's setup to be slave 14 instead of master.

wolfjmz
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Nice work! I do have my slave addr (17), but it seems I am having some sync problem, as the serial monitor is only displaying crazy squares. I am using 115200 baud rate for the monitor. Any thoughts?

AnnaJulia-nptn
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The how to part of the video is missing.

kesterbelgrove