Moxa IA3341-LX [65/72] Examples

IA3341 Linux User’s Manual Programmer’s Guide

6-10

unsigned long *duration - the duration of the DIN port is kept in high or low state.

- return to the current duration value of diport

Output: mode DIN_EVENT_HIGH_TO_LOW

(1): from high to low

DIN_EVENT_LOW_TO_HIGH(0): from low to high

DIN_EVENT_CLEAR(-1): clear this event

duration The value of duration should be 0 or 40 <= duration

<= 3600000 milliseconds.

Return: reference the error code.

Special Note

Don’t forget to link the library libmoxalib for DI/DO programming, and also include the header

file moxadevice.h. The DI/DO library only can be used by one program at a time.

Examples

DIO Program Source Code File Example

File Name: tdio.c

Description: The program indicates to connect DO1 to DI1, change the digital output state to high

or low by manual input, then detect and count the state changed events from DI1.

#include <stdio.h>

#include <stdlib.h>

#include <moxadevice.h>

#include <fcntl.h>

#ifdef DEBUG

#define dbg_printf(x...) printf(x)

#else

#define dbg_printf(x...)

#endif

#define MIN_DURATION 40

static char *DataString[2]={“Low ”, “High ”};

static void hightolowevent(int diport)

{

printf(“\nDIN port %d high to low.\n”, diport);

}

static void lowtohighevent(int diport)

{

printf(“\nDIN port %d low to high.\n”, diport);

}

int main(int argc, char * argv[])

{

int i, j, state, retval;