GPIB(4)

NAME
gpib - General-Purpose Instrument Bus (GPIB) driver

SYNOPSIS
Either of the pcii(4) or tnt4882(4) drivers use this driver as the backend.

DESCRIPTION
The gpib driver provides support for driving an IEEE-488 bus, also called IEC-625 (or just "IEC bus"), or HP-IB (Hewlett Packard Instrument Bus), or GPIB (General Purpose Instrument Bus). The device can become either a listener, talker, controller, and in particular a master controller on the bus.

  Example
The following example code queries the device provided as argv[1] for its identification response.

    /* compile with:  cc -O -o ibtest ibtest.c -lgpib */
    #include <stdio.h>
    #include <stdlib.h>
    #include <err.h>
    #include <vis.h>
    #include <gpib/gpib.h>
    int
    main(int argc, char **argv)
    {
    	int dmm;
            unsigned char buf[100];
            char vbuf[sizeof buf * 4];
            /* DVM */
            dmm = ibdev(0, (argc > 1? atoi(argv[1]): 7), 0,
    		    T10s, 1, 0);
            if (dmm < 0)
                    errx(1, "ibdev = %d\n", dmm);
            ibwrt(dmm, "*IDN?\r\n", 7);
            ibrd(dmm, buf, sizeof buf - 1);
            strvisx(vbuf, buf, ibcnt, VIS_WHITE | VIS_CSTYLE);
            printf("%s\n", vbuf);
            return (0);
    }

FILES

/dev/gpibNib
    Main device node to access the driver.

/dev/gpibNl
    Listen-only entry to the driver. When opening, an instrument can send data to this device on the bus in an unaddressed mode, for example hard-copy printer data.

SEE ALSO
gpib(3), pcii(4), tnt4882(4)

HISTORY
The gpib driver was written by Poul-Henning Kamp, and first appeared in FreeBSD 5.4.

AUTHORS
This manual page was written by Jörg Wunsch.