CCS/MSP430FR2155: MODBUS Message RTU Framing Missing Responses

Sandhya Yadav

Part Number: MSP430FR2155

Tool/software: Code Composer Studio

Hello All,

I am working on MSP430FR2155 microcontroller, In that I am using MODBUS RTU. In my controller I am using Uart to communicate with MODBUS, but in that I am not getting proper responses. I am checking the result on Modscan32, Valid slave responses are lesser then Number of Polls. How can I overcome this problem, Please suggest?

Thanks,

Sandhya

over 4 years ago

0 Xiaodong LI over 4 years ago

TI__Mastermind 20005 points

Hi Sandhya

MODBUS RTU is Application Layer Protocol based on UART

On the usage of UART on MSP430FR2155 microcontroller, please refer to the code example of FR2155: www.ti.com/.../slac740

On MODBUS implement on MSP430, please refer to the previous E2E discussion: https://e2e.ti.com/support/microcontrollers/msp430/f/166/t/191447?Modbus-MSP430-communication-strange-response

0 Johnson He over 4 years ago

TI__Mastermind 28286 points

Hi Sandhya,

Could you provide some details about this issue? some hardware connection and Partial related code.

It may be better if you have some test data.

Best Regards

Johnson

0 Johnson He over 4 years ago

TI__Mastermind 28286 points

Hi Sandhya,

I haven’t heard from you for ten days, so I’m assuming you were able to resolve your issue. If this isn’t the case, please click the "This did NOT resolve my issue" button and reply to this thread with more information. If this thread locks, please click the "Ask a related question" button and in the new thread describe the current status of your issue and any additional details you may have to assist us in helping to solve your issues.

Best Regards

Johnson

0 Sandhya Yadav over 4 years ago in reply to Johnson He

Intellectual 435 points

Thanks for reply,

Actually I am working on 2 timer interruts. One is used for MODBUS with ACLK clock and 400 timercount and other on 8MHZ with 5000 count. So I am not getting is there any clash happening in it or any other reason in between these two timers. please help.

Thanks,

Sandhya Yadav

0 Johnson He over 4 years ago in reply to Sandhya Yadav

TI__Mastermind 28286 points

Hi Sanghya,

Do you suspect that the 8MHz Timer interrupt conflicts with the ACLK interrupt, causing no proper responses in the MODBUD message?

You can turn off the 8MHz timer interrupt and test again.

Best Regards

Johnson

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CCS/MSP430FR2155: MODBUS Message RTU Framing Missing Responses