Unitech MR350 MKII Manual de usuario descargar pdf (Pagina 31)

3-30

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,&regs,&regs);

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,&regs,&regs);

}

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,&regs,&regs);

}

04 Disable RS-485 port for serial I/O

Entry Parameters: AH = 4

Returned Values: None

void TC_485_disable()

{

regs.h.ah = 4;

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Unitech MR350 MKII Manual de usuario Pagina 31