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Address ID for last byte...


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Dear All,


I have connected the UNITRONICS by RS485 port (CPU protocol) at 1 slave;I read only 1 register (but is the same if I try with 20 or more) and the buffer that come back has the byte of the address located for last! in the attached pic you can see that the B8 is the "request" and the B45 is the "answer"...B45= first byte from the left is "3" for function, second is "2" for the lenght, third and fourth are "3,231" are the value 999 that is correct, fourth and fifth are "248,254" for the CRC ...and last byte "0"!? 
how I have to do for have back the correct sequence?
thanks in advance.


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