Aleatory reading response from oscilloscope via serial port

Hello community,

I'm using a Win 7 systema with a Matlab R2015 with Instrument Control installed. And, a Tektronix TDS1012 oscilloscope connect to my computer via a USB-to-SERIAL connector.

The device is connected and recognized by the PC and the Instrument Control.

My first attempt reading response via command windows:

>> os = serial('COM5'); fopen(os); os

   Serial Port Object : Serial-COM5

   Communication Settings 
      Port:               COM5
      BaudRate:           9600
      Terminator:         'LF'

   Communication State 
      Status:             open
      RecordStatus:       off

   Read/Write State  
      TransferStatus:     idle
      BytesAvailable:     0
      ValuesReceived:     0
      ValuesSent:         0
 

>> fprintf(os, '*IDN?'); os.BytesAvailable

ans =

     0

>> response = fscanf(os)

response =

*IDN?

Whenever I try to query something, I got the command query as an answer.

But, here's the thing, if I send commands to set the oscilloscope, it works. (I reset with *RST and also Volt Range of CH1 and could see it in the oscilloscope display)

I also try using the Instrument Control App, and got the same result as previous.

I also icreated an IC Device with the tektronix_tds1012.mdd file driver, and got aleatory read responses and didn't work well setting some parameters.

I checked the Printer Port is at Centronics, and the RS232 is free for communication.

Am I missing some configuration on my oscilloscope in order to read what I expecte to be read?