Unitech PT630, Programming Reference Manual

Page: 58 / 73

PT630 Programming Reference Guide Page 58 of 59
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1.9.6 Set RTS/DTR Signal of RS232 Port
Entry parameter: AH = 5
AL = 1 ; set DTR
2 ; set RTS
DH = 0 ; set Enable (High voltage)
1 ; set Disable (Low voltage)
Return Value: None
Note: Only for NONE communication protocol
Example :
void TC_232_RTS(int rts)
{
regs.h.ah = 5;
regs.h.al = 2;
regs.h.dh = (unsigned char)rts;
int86(0X
14, &regs,&regs);
}
void TC_232_DTR(int dtr)
{
regs.h.ah = 5;
regs.h.al = 1;
regs.h.dh = (unsigned char)dtr;
int86(0X
14, &regs,&regs);
}
1.9.7 Get CTS /DSR Signal Status of RS232 Port
Entry Parameter: AH = 6
AL = 1 ; get CTS
AL = 2 ; get DSR
Return Value: DH = 0 ; High voltage on signal
1 ; Low voltage on signal
Note: Only for NONE communication protocol
Example :
int TC_232_CTS()
{
regs.h.ah = 6;
regs.h.al = 2;
int86(0X
14, &regs,&regs);
return((int)regs.h.dh);
}
int TC_232_DSR()
{
regs.h.ah = 6;
regs.h.al = 1;
int86(0X
14, &regs,&regs);
return((int)regs.h.dh);
}
1.9.8 Flush RS232 RX buffer
Entry Parameter: AH = 8
Return Value: None