Computer Hardware User Manual

4-10 Intellio C218Turbo /PCI User's Manual

Syntax for SCO UNIX/XENIX

#define MLOWATER 0x405

int lowater; /* low water value of output buffer (default = 512 bytes) */

ioctl(moxa_fd, MLOWATER, lowater);

Syntax for UNIX SVR4

#include <sys/stropts.h>

#include <sys/sysmacros.h>

#define MLOWATER 0x405

struct strioctl ioc;

int lowater; /* low water value of output buffer (default = 512 bytes) */

ioc.ic_cmd = MLOWATER;

ioc.ic_timout = 0;

ioc.ic_len = sizeof(int);

ioc.ic_dp = (char *)&lowater;

ioctl(moxa_fd, I_STR, &ioc);

6. MSTATUS

This function is used to know the RS-232 line status (CTS/DSR/DCD).

Syntax for SCO UNIX/XENIX

#define MSTATUS 0x407

int status; /* status = RS-232 line status */

/* bit0

¡ÐCTS (1:on, 0:off) */

/* bit1

¡ÐDSR (1:on, 0:off) */

/* bit2

¡ÐDCD (1:on, 0:off) */

ioctl(moxa_fd, MSTATUS, &status);