Flowcode Support Board

Hello,
I am using the AVR chipset with ATMEGA2560. I am really close to wrapping up my program. in my project I am sending a command to a device, get the data from the device and clean it, and lastly put the data into modbus registers.

My issue is with the modbus slave. I set the poll definition to slave ID 2, Function 03 reading holding registers. I have put my data into registers 100-104. I connect it to docklight to check if I have any errors. I do not have any error messages. I then modbus poll to read the registers but I keep getting error messages "Timeout Error" or "No Connection". Any advice? Thank you for your time. Attached is my code.

Hi,
Have you tried the master and slave simulators from here https://www.simplymodbus.ca/ to check that you are sending the right data format. It probably has enought capability in demo mode.

Bob

Hi,
I got it going somewhat. I have some questions on the ModbusSlave::CheckforIncoming(). Does the return bit act like a bool? Does it work like a UART initialize? Do I need an interupt? I saw an example program on the wiki but I think it was a bit simple.

RGV250 wrote: ↑

Thu Mar 02, 2023 9:56 am

Hi,
Have you tried the master and slave simulators from here https://www.simplymodbus.ca/ to check that you are sending the right data format. It probably has enought capability in demo mode.

Bob

Can I use this with flowcode simulation? How would I set it up in the simulation properties?

Can I use this with flowcode simulation? How would I set it up in the simulation properties?

Probably not, I onlt used it with real hardware.

Bob