How to connect to an instrument using RS-232 to USB converter?

Hello,

I'm trying to remotely control an instrument through a serial port. To make the connection an RS-232 to USB converter is used. I have installed all the latest drivers of the converter. The following commands are used to create the serial object and connect to it.

s = instrfind('Type', 'serial', 'Port', 'COM3', 'Tag', '');

s = serialport('COM3',9600);

fopen(s);

The property values, baud rate etc., are matched with the instrument's one. The serial communication is opened with success but unfortunately, neither can I send data to the instrument nor receive. A timeout error is shown when trying to receive data. The pin status of the RS-232 is:

s.PinStatus

ans =

struct with fields:

ClearToSend: off

DataSetReady: off

CarrierDetect: off

RingIndicator: off

Also, when trying to query the IDN:

fprintf(s,"*IDN?\n")

s.NumBytesAvailable

ans =

0

I've tested the converter in other applications and worked as intented.

What would the solution be? Does it have to do with the converter itself?