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AH = 0
AL = Data character
2) if no character received
AH = 1
AL = undefined
unsigned char TC_485_char_I()
{
regs.h.ah = 1;
int86(0x33,®s,®s);
if (regs.h.ah == 0)
return(regs.h.al);
return(255);
}
02 Output data
Entry Parameters: AH = 2
AL = Data character
Returned Values: None
void TC_485_char_O(unsigned char ch)
{
regs.h.ah = 2;
regs.h.al = ch;
int86(0x33,®s,®s);
}
03 Enable RS-485 port for serial I/O
Entry Parameters: AH = 3
Returned Values: None
void TC_485_enable()
{
regs.h.ah = 3;
int86(0x33,®s,®s);
}
04 Disable RS-485 port for serial I/O
Entry Parameters: AH = 4
Returned Values: None
void TC_485_disable()
{
regs.h.ah = 4;