Unitech PT600, Programming Reference Manual

Page: 13 / 77

Entry Parameter: AH = 1
Return Value: AL = 0 – 255 ; ASCII character
Example:
unsigned char TS_stdin()
{
regs.h.ah= 1;
int86(0x21,&regs,&regs);
return(regs.h.al);
}
02 Write LCD
Entry Parameter: AH = 2
DL = 0 – 255 ; ASCII character
Return Value: None
Example:
void TS_stdout(unsigned char ch)
{
regs.h.ah= 2;
regs.h.dl= ch;
int86(0x21,&regs,&regs);
return;
}
03 Read RS232 (wait if no character)
Entry Parameter: AH = 3
Return Value: AL = 0 – 255 ; ASCII character
Note: Only for NONE communication protocol
Example:
unsigned char TS_stdaux_in()
{
regs.h.ah= 3;
int86(0x21,&regs,&regs);
return(regs.h.al);
}
04
Write RS232
Entry Parameter: AH = 4
DL = 0 – 255 ; ASCII character