EMBRON Hatteland Display HT B22G Series, Руководство пользователя

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61
API / VCOM Commands
Appendix
IND100077-132
Basic Example for setting Half/Full Duplex Mode
Example using Linux, C style.
Note, ttyS7 has been used as port ID. It may differ depending on your system installation. In any case, simply write
ttyS x (where x is the number defined by the Operating System automatically) for Virtual COM Port.
#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <errno.h>
#include <termios.h>
#include <unistd.h>
int main( void )
{
int n;
int f;
struct termios options;
//Open COM Port
f = open(“/dev/ ttyS7 ”, O_RDWR | O_NOCTTY | O_NDELAY);
if (f == - 1 )
{
perror(“open_port: Unable to open:”);
return - 1 ;
}
else
{
printf(“COM Port Opened!\n”);
fcntl(f, F_SETFL, 0 );
}
//Configure COM Port
tcgetattr(f, &options);
cfsetispeed(&options, B9600);
cfsetospeed(&options, B9600);
options.c_cflag |= (CLOCAL | CREAD);
options.c_cflag &= ~PARENB;
options.c_cflag &= ~CSTOPB;
options.c_cflag &= ~CSIZE;
options.c_cflag |= CS8;
tcsetattr(f, TCSANOW, &options);
//Half Duplex Write
unsigned char half_duplex_cmd[ 9 ] = { 0x07,0xFF,0x51,0x44,0x55,0x01,0x0E,0x00,0xFF };
write(f, half_duplex_cmd, 9 );
printf(“Sent Half Duplex\n”);
//Full Duplex Write
unsigned char full_duplex_cmd[ 9 ] = { 0x07,0xFF,0x51,0x44,0x55,0x01,0x0E,0xFF,0x00 };
write(f, full_duplex_cmd, 9 );
printf(“Sent Full Duplex\n”);
//Close COM Port
close(f);
printf(“Finished!\n”);
return 0 ;
}