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parth kothiya
parth kothiya
Associate III
October 3, 2019
Question

How to detect MODBUS RTU end of frame( silent interval) using uart interrupts?

  • October 3, 2019
  • 1 reply
  • 2071 views

MODBUS RTU frame start and end with >=3.5 char interval i want to detect this interval using stm32 uart interrupt after detection of frame and i can process data further.

How can i detect this silent char interval using uart interrupt or any other way to do this?0690X000009jzROQAY.png

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1 reply

Ozone
Ozone
Principal
October 3, 2019

Some STM32 MCUs have UART peripherals with integrated idle timer. You could use that.

Or for MCUs without, start/restart a 3.5-character timer at each character reception. If it times out, it's probably a frame end.

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