Modbus RTU Rs232

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markavo42
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Modbus RTU Rs232

Post by markavo42 »

Wonder if you can shed some light on this please i will try and explain
I'm also using some software to test the data i'm sending is correct then using FC8 and ST-ARM to send the same data.

On serial monitor software i send an hex string (highlighted one is the manual string sent) the none highlighted is the string sent with FC8
As you see they are both the same (i get a response as expected on the software one and not as expected from the FC8 one)

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Readable string sent from software as you can see all looks ok.

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Readable string from FC8 and ST-ARM it looks to me that the data is missing or moved.

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I have hardwired all connections just to be double sure, same issue.
Am i missing something simple or is it something else.

Thank you :D

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LeighM
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Re: Modbus RTU Rs232

Post by LeighM »

In Modbus properties:
Is your receive buffer size set to be big enough for the received data?
Is the receive timeout long enough?

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