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3.5. Relay Output / Digit Input / Buzzer / LED Indicator
Set LED indicator ON/OFF INT 09H
Entry Parameters: AH = 2
Bit# 76543210
AL= 0000xxxx, where:
x: 1, Set LED on
0, Set LED off
Bit0: LED1
Bit1: LED2
Bit2: LED3
Bit3: LED4
Returned Value: None
Ex. AL = 00000011 means to turn on LED1 and LED2.
void TD_LED(int led1,int led2,int led3,int led4)
{
regs.h.ah = 2;
regs.h.al = 0;
if (led1 > 0) regs.h.al = regs.h.al | 1;
if (led2 > 0) regs.h.al = regs.h.al | 2;
if (led3 > 0) regs.h.al = regs.h.al | 4;
if (led4 > 0) regs.h.al = regs.h.al | 8;
int86(0x09,®s,®s);
}
Read Photo Coupler Level state INT 08H
Entry Parameters: AH = 1 ;Read input from port 1
2 ;Read input from port 2
3 ;Read input from port 3
4 ;Read input from port 4
AL = 0 ;Read level state
1 ;Read edge switching state
Returned Values: by level
AL = 0 (LOW)
1 (HIGH)
Returned Values: by edge switching state
AL = 0 (No switching edge)
1 (Switching edge occurred)
int TD_photocouple(int port,int type)
{