Moxa Technologies C360 Bedienungsanleitung PDF herunterladen (Seite 32)

Chapter 4 • • For UNIX Users

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open( ), ioctl( ) , read( ), write( ), close( ), etc. Please refer to the UNIX

Programmer's Reference manual. However, these system services only

provide a limited functions and thus may not satisfy the sophisticated

programmers' need. In order to meet the user's special needs, MOXA supports

extended services through ioctl( ) command which are listed below.

Note that UNIX system services can not be applied to MOXA Non-TTY ports

and please refer to the next Section for more details.

Extended Function List for MOXA TTY Ports :

1.MIBUFED (=0x401) To get byte count in input buffer.

2.MOBUFED (=0x402) To get byte count in output buffer.

3.MTCRTS (=0x403) To control RTS output signal.

4.MTCDTR (=0x404) To control DTR output signal.

5.MSTATUS (=0x407) To read modem line status (CTS/DSR/DCD).

6.MHWFLOW (=0x40e) To enable/disable the hardware flow control.

Function Description :

The following lists the syntax of MOXA extended functions for SCO UNIX.

The variable moxa_fd is the returned file descriptor by open( ) a specific

MOXA TTY port. For example,

int moxa_fd;

moxa_fd = open("/dev/ttya11",O_RDWR);

1. MIBUFED

This function let user know how many bytes queued in input buffer

when this function is issued.

#define MIBUFED 0x401

int count; /*number of bytes queued in the input buffer*/

ioctl(moxa_fd, MIBUFED, &count);

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Moxa Technologies C360 Bedienungsanleitung Seite 32