Write to Serial Port without splitting string data

Hi, all, thank you for your help in advance.
Problem:
I am trying to write to the serial port with VISA write module. Somehow the string I tried to send was splitted before it was sent. For example, if I want to send "127", it sends "7', "2", "1". I don't know if there's anyway to configure the module so that it sends out the whole string at once. I use the return count to indicate how many times it spits the data. So "127" now returns "3" (sent three times. I would like to have it to return "1" so that "127" was sent in whole).
Project:
I am working on an application where a DC motor is controlled by a controller talking to the PC's serial port. "127" stands for its maximum power. The controller devides the power into 128 steps. Therefore I need to input number from 0 to 127 to command the speed.
Any help or suggestion will be appreciated!

Thanks for the prompt replies.
About Number/ASCII
I am using the Atmega128-Controller Chip to read in the signals sent from the computer serial port. Then it sends signals to the motor controller. The Atmega chip reads the ASCII string and converts it to hexadecimal number, sending that number to the motor controller. I can program the Atmega chip so that it either translates the ASCII string into hex as mentioned or accepts as it is. Either way, I want it to read two byte information at once (00 to 7F).
If the VISA serial write can send only one byte at a time, then I may have to program the chip so that it buffers the readings. I have tried using number/hex converter and number/string converter, either case, the fact that VISA Write spits one byte at a time hinders the programming. For example: I defined numbers 1 to 5 represents 20% to 100% power output with 20% increment Then I defined "10" as "90%" power, but it reads "1" "0" seperately, so the actual out put is "20%" then "0%".
I used the example VI provided by NI : advanced serial write/read. For convenience, attached here. Not all modification I made is saved.

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Write to Serial Port without splitting string data

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