I have a code which has different functions for reading and writing holding registers and coils and reading input registers. Of these 5 functions, the function for reading input registers is not working. According to the error message the CID declaration is wrong but it seems right. Can anybody plea...

I have written a modbus code which has separate functions to read and write holding registers, read and write coils and read input registers. The rest of the functions work properly except read input registers. The error says that the CID declaration is wrong but I am not able to find what is wrong ...