ESP8266 Community Forum

good evening,

I am researching modbus ascii for esp8266, someone has information about ??

I want to communicate two chillers that are smc has this communication option, so put esp as master and make available to the wifi and integrate with ScadaBR.

att

If your MODBUS device supports RTU, I think you'll find that cleaner to implement -- and you send fewer bytes (about half) in each transaction. ASCII is certainly more human-friendly to look at, but I don't think the development effort worthwhile. I did a MODBUS RTU implementation for the Parallax Propeller that was used in a large HVAC system and also communicated with chillers, solar panels, etc.

This doc spells it out:
-- http://www.modbus.org/docs/Modbus_Appli ... V1_1b3.pdf