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Chapter 3 Developing Your NI-488.2 Application
NI-488.2 User Manual for Windows 3-6 www.natinst.com
you check for possible errors after each call using the
ibsta
ERR bit,
debugging your application is much easier.
ibsta
is a 16-bit value. A bit value of one (1) indicates that a certain
condition is in effect. A bit value of zero (0) indicates that the condition is
not in effect. Each bit in
ibsta
can be set for device-level traditional
NI-488.2 calls (dev), board-level traditional NI-488.2 calls and
multi-device NI-488.2 calls (brd), or all (dev, brd).
Table 3-1 shows the condition that each bit position represents, the bit
mnemonics, and the type of calls for which the bit can be set. For a detailed
explanation of each status condition, refer to Appendix B, Status Word
Conditions.
Table 3-1. Status Word Layout
Mnemonic
Bit
Pos
Hex
Value
Type Description
ERR 15 8000 dev, brd NI-488.2 error
TIMO 14 4000 dev, brd Time limit exceeded
END 13 2000 dev, brd END or EOS detected
SRQI 12 1000 brd SRQ interrupt received
RQS 11 800 dev Device requesting
service
CMPL 8 100 dev, brd I/O completed
LOK 7 80 brd Lockout State
REM 6 40 brd Remote State
CIC 5 20 brd Controller-In-Charge
AT N 4 10 brd Attention is asserted
TAC S 3 8 brd Talker
LACS 2 4 brd Listener
DTAS 1 2 brd Device Trigger State
DCAS 0 1 brd Device Clear State