Moxa Technologies C168HS user manual Mhwflow

Serial Programming Tools

Syntax for SCO UNIX/OpenServer
#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);
Syntax for UNIX SVR4.2
#define MSTATUS		0x407
#include		<sys/stropts.h>
#include		<sys/sysmacros.h>
struct strioctl		ioc;
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)	*/

ioc.ic_cmd = MSTATUS; ioc.ic_timout = 0; ioc.ic_len = sizeof(int); ioc.ic_dp = (char *)&status; ioctl(moxa_fd, I_STR, &ioc);

7. MHWFLOW

This function is used to enable/disable hardware flow control. The first open() function of a port will set the hardware flow control bits on or off depending on the [RTS/CTS Hardware Flow Control] configuration in mxadm. However, users might want to control the DTR or RTS signal on their will, thus the RTS flow control bit should be turned off (HWFLowControlOff) in order to take over the control of DTR or RTS signal via function MTCRTS or MTCDTR. MTCRTS and MTCDTR can be effective only after the RTS flow control bit of MHWFLOW is turned off.

Smartio C168H/HS User’s Manual 4-11