Unitech PT630, Programming Reference Manual

Page: 57 / 73

PT630 Programming Reference Guide Page 57 of 59
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1.9.2 Get Character from COM 2 RS232 Port
Entry Parameter: AH = 1
Return Value: 1) AH = 0 ; has character input
AL = character
2) AH = 1 ; no character input
Note: Only for NONE communication protocol
Example:
unsigned char TC_232_char_I()
{
regs.h.ah = 1;
int86(0x
14 ,&regs,&regs);
if (regs.h.ah == 0)
{
return(regs.h.al);
}
return(255);
}
1.9.3 Send Character to COM2 RS232 Port
Entry Parameter: AH = 2
AL = character
Return Value: None
Note: Only for NONE communication protocol
Example:
void TC_232_char_O(unsigned char ch)
{
regs.h.ah = 2;
regs.h.al = ch;
int86(0X
14, &regs,&regs);
}
1.9.4 Enable COM2 RS-232 Port
Entry Parameter: AH = 3
Return Value: None
Example:
void TC_232_enable()
{
regs.h.ah = 3;
int86(0x
14 ,&regs,&regs);
}
1.9.5 Disable COM2 RS-232 Port
Entry Parameter: AH = 4
Returned Value: None
Example:
void TC_232_disable()
{
regs.h.ah = 4;
int86(0X
14 &regs,&regs);
}