Greetings!

I have encountered a problem I cannot solve.
I am using the QSerialPort device to read/write data from/to my hardware device.
I am encountering problem just after sending a request to start my device's main sequence.
After getting all information my device is sending near a 370 bytes to the serial port via a RS-485->transform device->USB and I am supposed to get the readyRead() signal so I will be able to parse the data. But I do not get the signal at all. Though after I send the second request - I get the readyRead() signal and begin the parsing procedure. And this situation repeats again and again.
Can anyone help me with this?

It seems much that the problem is connected with my PC. I have made a simple terminal software and checked it on my work and at home. On my working pc the software worked well with both directions but at home this terminal is operating in the same strange way as the main software.

Thank everyone in advance!