Unitech PT630, Programming Reference Manual

Page: 25 / 73

PT630 Programming Reference Guide Page 25 of 59
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1.5.13.3 Software Control Flow
Entry Parameter: AH = 1CH
BH = 2
AL = 0 ; Enable XON/XOFF control flow
1 ; Disable XON/XOFF control flow
Return Value: None
Note: Only for NONE communication protocol
Example
:
void TC_flow_ctrl(int status)
{
if (status == 0)
// Set flow control to none
{
regs.h.ah = 0x1C;
regs.h.bh = 2;
regs.h.al = 1;
int86(0x21,&regs,&regs);
regs.h.ah = 0x1C;
regs.h.bh = 3;
regs.h.al = 1;
int86(0x21,&regs,&regs);
}
else if (status == 1)
{
regs.h.ah = 0x1C;
regs.h.bh = 2;
regs.h.al = 0;
int86(0x21,&regs,&regs);
}
else
{
regs.h.ah = 0x1C;
regs.h.bh = 2;
regs.h.al = 1;
int86(0x21,&regs,&regs);
}