How to use TOPOSPOSPrinter - Delphi

Hi,

I am trying to print on a receipt printer using OPOS, but am facing a few issues. To begin with, I have installed the SetupPos application from the Epson site and am able to successfully print using the 'CheckHealth Interactive' option. I have then imported the OPOSPOSPrinter.ocx in Delphi and this resulted in the TOPOSPOSPrinter component getting added to the 'ActiveX' pallete in my Delphi IDE. I have then created a new application and dropped this component on the form, and on a button click event wrote the below code.
procedure TForm1.Button1Click(Sender: TObject);
begin
try
  Oposposprinter1.Open('TestPrinter'); //LDN for receipt printer
  Oposposprinter1.ClaimDevice(1000);
  Oposposprinter1.DeviceEnabled := True;
  Oposposprinter1.PrintNormal(PTR_S_RECEIPT,WideString('Hello - Testing POS printer'));
finally
  Oposposprinter1.DeviceEnabled := False;
  Oposposprinter1.ReleaseDevice;
  Oposposprinter1.Close;
end;

Whle compiling this simple application, I get an "Undeclared Identifier: 'PTR_S_RECEIPT'" error at the line Oposposprinter1.PrintNormal(PTR_S_RECEIPT,WideString('Hello - Testing POS printer')); in the code. Is there something that I am missing in the way the ocx should have been installed? I am not sure how the PTR_S_RECEIPT constant should be used. Should the PTR_S_RECEIPT be explicitly declared in my application or is there any constants file that I should be adding in my uses clause?

Appreciate any help.
Regards
P