ModemStatus on serialport

[KikePie]

On Serial Port ModemStatus is not enable, or what doing wrong..
procedure TFormMain.OnDataAppearHandler(Sender: TObject);
var
sData: AnsiString;
begin
// sData := DataPort.Pull();
if DpSerial.ModemStatus.DTR then begin // this works but never get status true and DataPort.ModemStatus.DTR doesn't work
bLESignal.Color:=clRed;
bLESignal.Active:=true;
end else if DpSerial.ModemStatus.CTS then begin
bLESignal.Color:=clbLUE;
bLESignal.Active:=true;
end else if DpSerial.ModemStatus.RTS then begin
bLESignal.Color:=clNavy;
bLESignal.Active:=true;
end else if DpSerial.ModemStatus.DSR then begin
bLESignal.Color:=clAqua;
bLESignal.Active:=true;
end else begin
bLESignal.Color:=clDefault;
bLESignal.Active:=false;
end;
SData:= DpSerial.Pull();
AppendToTerminal(sData);

end;

[serbod]

What RS-232 hardware you using? Is it have physical control signal lines?
Try DpSerial.GetModemStatus() before reading DpSerial.ModemStatus.

[KikePie]

I using USB Serial Port

[KikePie]

I ty to get modemstatus but still same don't get any value ...

[serbod]

I using USB Serial Port

Some cheap USB-RS232 adapters don't have modem control lines, only data lines TX/RX.