marcin1j / esp8266-modbus-gateway Goto Github PK

By default D1 (GPIO5, you can change this in main.py) is used for driver enable control and needs to be connected to converter's DE (active high) and RE (active low) pins.

Do I understand correctly that you connected GPIO5 to both DE and RE pins at the same time? So that DE and RE on the converter are connected?

I am not yet familiar with these RS-485 TTL converter modules and am looking to try out your example, but that just seems a bit strange

Hi,

first of all, thanks for your effort! I want to integrate our home sauna with Home Assistant, unfortunately the only interface provided by the sauna is an actual 3-wire Modbus interface, so this project will be my chance to get the integration running.

Currently, I'm experiencing some problems... Doing some polls usually works fine, but sometimes I'm getting the following error:

INFO:modbus:Starting to serve 192.168.128.252:35040
WARN:modbus:RTU read: short read 3/4
INFO:modbus:Served 192.168.128.252:35040
INFO:modbus:New connection from ('192.168.128.252', 35054)
INFO:modbus:Starting to serve 192.168.128.252:35054
WARN:modbus:RTU read: short read 3/4
INFO:modbus:Served 192.168.128.252:35054

Any idea what could cause this "short read" and how to prevent that?

I'm running your code on a Wemos D1 Mini, with the following UART settings:

UART(0, 19200, bits=8, parity=None, stop=1, timeout=1000, timeout_char=10, rxbuf=1024)

Would be great if you could give me some hints here... Thanks!

Best regards
Matthias