SerialPort Low Level Settings?

[pourkascheff]

Hi all.

Mimicking a RS-232 communication with a specific device is desired.
General settings (Baud rate, Parity, Handshake, Word length and other properties grid provided) were done and confirmed that they're OK. A correct sequence of request command was applied through the port but no answers were received.

After monitoring what's happening on the port, found that some settings were different in spite of "general" (some-say) settings are matched. Different subitems are as following:

---------------
Eofchar               0
Errorchar             0
Breakchar             0
Eventchar             0
Xonchar               17
Xoffchar              19
---------------
Flags=0x0000000F
---------------
ControlHandshake      0x01
Flowreplace           0x00
Xonlimit              100
Xofflimit             100
---------------

The question is how to access and change their values to desirable values?
Is it even possible? Should I renew my V.S.? I gathered some articles in different forums (even here) but nothing operational were catch.
All mentioned parameters are not members of 'System.IO.Ports.SerialPort'. Maybe you could introduce me a way to achieve a kind of low level accessibility.
Thanks in advance.