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The Status Byte
Register
As shown in Figure 4-1, the Status Byte register is the highest-level register in
the status structure. This register contains bits which summarize information
from the other status groups.
NOTE The bits in the other status group registers must be specifically enabled to be
reported in the Status Byte register. Refer to "Unmasking Standard Event Status
Bits" (later in this chapter) for more information.
Status Byte Register
Bit 0 Instrument Specific
Bit 1 Instrument Specific
Bit 2 Instrument Specific
Bit 3 Questionable Data Summary Bit
Bit 4 Message Available
Bit 5 Standard Event Summary Bit
Bit 6 Service Request
Bit 7 Operation Status Summary Bit
Operation Status Group
Standard Event Status Group
Questionable Data Status Group (not used)
Figure 6-1. Status Structure
Controlling Instruments Using GPIB 6-3