NAME

ibtab − format of ibtab file

DESCRIPTION

The ibtab file is an unordered collection of entries, each of which describes one IEEE 488 bus node.  Its format is understood by the ibtab (4) subroutine package, which is used by programs such as iib (1M).  The format and the package are loosely patterned after getpw (3C), and passwd (4).  Each entry consists of a line with colon-separated fields.  Numeric items are interpreted according to the usual C rules: leading 0x implies hex, leading 0 implies octal, default decimal. 

FIELDS

File
the ib file used to access the node.

Cfile
the control file used to ioctl (control) the node.

Node
the node (physical slot) number with respect to the control file. The host’s node number is 0.

Flags
flags pertaining to the node, as defined in the include file <sys/ib_ioctl.h>. This field may be numeric or symbolic, with symbols separated by the ’|’ character or white space. Possible flags are: SWAB, if the node does byte-reversed IEEE 488 bus i/o; VALID, if the node is for real; SRQ, if the node can assert SRQ; PPE, if the node can respond to parallel polls; PPC, if the node can be remotely configured for parallel polls; SC, if the node is system controller.

Tag
the IEEE 488 bus address of the node.

Ppr
the parallel poll response. The low-order 3 bits specify which line the node uses for parallel poll responses. This field is significant only if the IBN_PPC or IBN_PPE flags are present.

Comment
ignored.

Lines beginning with the ’#’ character are ignored. 

EXAMPLE

# sample entry
# node 1, /dev/ib01
# controlled by /dev/ib00
# byte-reversed, can srq and ppoll
# gpib address 19
# ppoll line 3
/dev/ib1:/dev/ib0:1:VALID|SWAB|SRQ|PPE:19:03:board 0 node 1

SEE ALSO

ib(7), iib(1M)

Version 2.4  —  September 29, 2021