Post processing the received serial data

Hello,

I want to process the data received by comport in labview where the transmitter device sends 22 bytes of data in this format 0x01 0x02 <18 bytes of information data with LSB first> 0x03 0x0Dthrough the comport which should be read using Labview. I want to process the received 22 bytes in labview as below

1)      Leave the first 2 bytes and last two bytes

2)      From the left 18bytes each consecutive set of 3 bytes should be reversed (because the transmitter sends the LSB first) and stored in a text file.

Can anyone suggest me the steps to implement this.

Thanks.