Unitech PT600, Programming Reference Manual, Page: 29 / 77

}
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);
}
1C Hardware Control Flow
Entry parameters: AH = 1CH
BH = 3
AL = 0 ; Enable CTS/RTS control flow
1 ; Disable CTS/RTS control flow
Return Value: None
Note: Only for NONE communication protocol
1C Set Communication Protocol
Entry Parameter: AH = 1CH
BH = 4
AL = 2 ; Set to MULTIPOINT protocol
3 ; Set to NONE protocol
Return Value: None
Example :
void TC_protocol(int status)
{
regs.h.ah = 0x1C;
regs.h.bh = 4;
regs.h.al = (unsigned char)status;
int86(0x21,&regs,&regs);
}