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ESP with MODBUS protocol
Posted:
Sun Apr 12, 2015 12:15 amby haimgbs
i am looking for implementing MODBUS protocol in to the ESP , using a simple web server for setup and configuration and ability to connect to SCADA / HMI . i am looking for someone with the ability to implement it and joint this business opportunity.
Re: ESP with MODBUS protocol
Posted:
Sun Apr 12, 2015 7:47 pmby kartman
Modbus is quite easy to implement. What are you wanting to do? Implement a modbus tcp to rtu/ascii gateway?
In another post i noted my investigations into doing rs485 and the challenges involved. Since doing that there seems to be a microsecond timer that might make implementing rs485 easier.
Also, i'm not sure the limitation of one server still exists - you need two server sockets, one for modbus tcp and another for the webserver
Re: ESP with MODBUS protocol
Posted:
Wed Apr 22, 2015 3:13 pmby frank_dunn1
I have tried to get modbus Tcp to work on a olimex board with esp8266 , it needs a lot extras to be added in but basic function 3 and 6 for 1 register with crc16 works . I can share the code if you want it.
Re: ESP with MODBUS protocol
Posted:
Wed May 13, 2015 3:30 amby aniston
frank_dunn1 wrote:I have tried to get modbus Tcp to work on a olimex board with esp8266 , it needs a lot extras to be added in but basic function 3 and 6 for 1 register with crc16 works . I can share the code if you want it.
Hello Frank, I am interested in getting Modbus functionally from the ESP8266, can you share your code ?
thanks,
aniston.