User`s manual

Table Of Contents

4-10 Intellio C320Turbo/PCI User's Manual

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, you might

want to control the DTR or RTS signal, 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 is turned off.

Syntax for SCO UNIX/XENIX

#define MHWFLOW 0x40e

#define HWFlowControlOff 0x00

#define CTSFlowControlBitOn 0x01

#define RTSFlowControlBitOn 0x02

#define HWFlowControlOn 0x03

ioctl(moxa_fd, MHWFLOW, CTSFlowControlBitOn);

ioctl(moxa_fd, MHWFLOW, RTSFlowControlBitOn);

ioctl(moxa_fd,MHWFLOW, CTSFlowControlBitOn | RTSFlowControlBitOn);

Syntax for UNIX SVR4

#include <sys/stropts.h>

#include <sys/sysmacros.h>

#define MHWFLOW 0x40e

#define HWFlowControlOff 0x00

#define CTSFlowControlBitOn 0x01

#define RTSFlowControlBitOn 0x02

#define HWFlowControlOn 0x03

struct strioctl ioc;

int setting;

setting = CTSFlowControlbitOn;

ioc.ic_cmd = MHWFLOW;

ioc.ic_timout = 0;

ioc.ic_len = sizeof(int);

ioc.ic_dp = (char *)&setting;

ioctl(moxa_fd, I_STR, &ioc);