How can I change the SET_CHARS and SET_HANDFLOW values ​​when initializing a COM port in java?

Question

Java

Hello.
I work at an academic institute as a researcher. I work with a delphi program written a long time ago and there is no one to talk to. Its essence is to receive a signal from the weight sensor, process it and control the power of a certain power generator. To do this, the program has a certain device with a microprocessor. I know the desoldering, but I don’t know about the microprocessor. But I have the text of the program. And then I undertook to rewrite it in java.

Now I am engaged in the connection of the program with the microcontroller using the Com port. I am using jserialcomm and jssc library.
I am monitoring the byte stream through the Serial Port Monitor from an old program with a new java program.
I see that the old Delphi program sends

IRP_MJ_DEVICE_CONTROL (IOCTL_SERIAL_SET_CHARS)
00 00 00 00 00 00 
IRP_MJ_DEVICE_CONTROL (IOCTL_SERIAL_SET_HANDFLOW)
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

A program in java

IRP_MJ_DEVICE_CONTROL (IOCTL_SERIAL_SET_CHARS)
00 00 00 00 11 13 
IRP_MJ_DEVICE_CONTROL (IOCTL_SERIAL_SET_HANDFLOW)
01 00 00 00 40 00 00 80 00 08 00 00 00 02 00 00

Is it possible using some library to send SET_CHARS and SET_HANDFLOW filled with only zeros?