Seldom Nonresponses

[j-broome]

Running the example rtu slave with no flow control. Just using USB to UART0 for now. When I use FinSH to run the slave demo, everything seems to work, but Modbus Poll has shown occasionally the slave does not respond. I tried adjusting the priority from 10 to 5 so it wasn't fighting with the main task, but still seeing the slave not respond sometimes.

Since the terminal is running on uart0, when I run the slave from uart0, does it hand the port off or is that where my issues are coming from?

[j-broome]

I have the demo running on UART port 1 (GP4/pin 6 and GP5/ pin 7). I have Modbus Poll polling 10 holding registers 0 through 9 every second.
I run the slave demo through FinSH as suggested:

Modbus Poll Setup:


Register 3 is incrementing as per the sample code:

But here is the problem (7 out of 132 messages have experienced a transmit timeout) that I was able to screenshot showing the communication log:

Any suggestions? This is the example with no modifications other than correcting the Pico systick in RT per: https://github.com/RT-Thread/rt-thread/pull/6242/commits/

[j-broome]

The only thing I did notice I had incorrect was the parity, but still seeing the same result after recompiling and trying again. Changed it to Even Parity per the demo setup.