Measurement Computing GPIB-488 - Manual (Page 103)

GPIB-488 B-1 Programming Reference Manual
B
IBSTA
Every GPIB library routine returns a 16-bit status word to the variable
ibsta . This status word describes the current condition of the GPIB bus
lines and the GPIB Interface Board. By examining the status word, the
programmer may determine what path the application program is to take.
Note that the mnemonics used to describe each bit of the status word are
defined within the header file for each language.
The status word contains 16-bits. If a bit equals 1 (set), the corresponding
condition is true. Likewise, if a bit equals 0, then the corresponding
condition has not occurred. The status word is of the following format:
Bit 15 14 13 12 11 10 9 8
ERR TIMO END SRQI RQS CMPL
Hex
Value 8000 4000 2000 1000 800 100
Bit 7 6 5 4 3 2 1 0
LOK REM CIC ATN TACS LACS DTAS DCAS
Hex
Value 80 40 20 10 8 4 2 1