Hwasung HP-283, Technical Manual, Page: 73 / 85

Title Rev. Page
HP-283 Technical Manual
Ver1.01 P.72
6. USB (User Interface)
Without using the Windows driver, you are able to check the printer status, and transmit / receive the data, by using
USB Interface DLL (HwaUSB.DLL) and OCX driver (HwaUSB.OCX).
6-1) DLL Interface
Place the HwaUSB.DLL into the System32 folder or SysWow64 folder depending on your Operating System‟s
bit version.
6-1-1) DLL (Funtions)
1)long UsbOpen(LPCTSTR SelPrinter);
Open the USB port to Printer Model “HMK-081”.

Parameters:
SelPrinter : Printer Model Name

Return :
Open Normal: 0
Open Error: -3(negative)
2)long PrintStr(LPCTSTR data);
Prints String.

Parameters:
data : String datas

Return :
Print Normal : 1
Print Error : 0
※
To prevent the loss of data for the print timeout, please use the function „NewRealRead‟ to check the
status, and go to the next step, when it‟s normal.
3)long PrintCmd(unsigned char data);
Prints 1 byte of data. When printing big data spool, use the following PrintPacket Value to increase the
transfer Speed.

Parameters:
data : 1 byte data (0~255)

Return :
Print Normal : 1
Print Error : 0