Unitech PT630, Programming Reference Manual

Page: 49 / 73

PT630 Programming Reference Guide Page 49 of 59
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1.5.38 Check RS232 Output Buffer Status in MULTIPOINT Protocol
Entry Parameter: AH = 5EH
Returned Value: AL = 0 ; output buffer is empty
1 ; output buffer has data
Note: 1) Only for MULTIPOINT communication protocol
2) The function can be used to check if data has been sent to Host computer.
Example
:
int TC_ready(int wait)
{
do {
regs.h.ah= 0x5E;
int86(0x21,&regs,&regs);
} while (wait && regs.h.al);
return(regs.h.al);
}