not getting bytes from serial port

Hello friends,

I have a force measuring instrument connected to CPU using RS-232 cable. I use the labview program made using VISA write and read. I get correct force readings. But my problem is that I get higher values of "bytes at port" reading. The instrument sends maximum 16 bytes but I see 4065 or something greater than 16byte. I can even see the COM port in MAX. Why is that happeneing? How to solve this?

Thanks

Ashnu