I have the same problem, but only when using multiple serial ports at 
higher baudrates. I use libmodbus including 
*MODBUS_ERROR_RECOVERY_PROTOCOL. *
I notice many CRC errors and timeouts when using four serial ports together.

On Monday, August 26, 2013 8:37:42 AM UTC+2, pyro...@gmail.com wrote:
>
> Hi guys,
> thanks for responses.
>
> Im developing soft in java, its simple and work already on many different 
> system and architectures.
> This is simple: my program send query frame to custom device and device 
> sends reply with some data as modbus frame.
> And here is problem. When i have baudrate > 2400 then some troubles seems 
> to appear. I know how many data should i get, for example i know that frame 
> will be 100 bytes but i receive 97bytes. 
>
> I tried to use UART1 and UART2. Same problem on both.
> Im using BBB, OS angstrom, kernel 3.8.13.
>

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