Arduino Modbus

at this moment i just can read one char, even if i declare two on the arduino...

Post the code you're currently working with.

Evan is i load just one char in each register, after in the kepware i'm not reach all the array. i just rad the char from each register in different tag's on the kepware....

Sorry, I don't understand that. If you have one character in a register, the registers value is simply the ASCII value of that character. I don't see a problem.