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CMB27 / ModbusRTUSlave

This is an Arduino library that implements the slave/server logic of the Modbus RTU protocol.
MIT License
58 stars 14 forks source link

How to catch data have changed event #36

Closed vanhcm20 closed 3 months ago

vanhcm20 commented 3 months ago

Hi @CMB27 First, Im new in ModbusRTU, frogive me if this is stupid question. How I can catch when have data changed, i dont want read all data continously

CMB27 commented 3 months ago

@vanhcm20 Not a stupid question,

The 2.x.x versions of this library do not have a way of directly detecting if data (coils, holding registers, etc.) have changed. The way you would do this, is to compare your data array(s) from before and after running poll().

This was one of the choices I made in the development of this library going from 1.x.x to 2.x.x. In 1.x.x you would need to hand functions to the library for reading and writing data, rather than arrays. This made the library a lot more flexible, but it was also much more cumbersome to setup.

vanhcm20 commented 3 months ago

Thanks for your feedback, i think this will be good function in future , but now, it's good enough to use Thank you