ESP8266 Community Forum

- Tue Jul 19, 2016 5:47 pm #51066 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

- Sun Sep 04, 2016 12:36 pm #54457 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