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IEEE-488.2 Common Commands
VX4380 256-Crosspoint Relay Matrix Module User Manual
3–57
*STB?
Status Byte Query. This query returns the value of the Status Byte register as a
numeric value between 0 and 255. The Status Byte register contents (with the
exception of bit 6) are also returned in response to a VXI Read STB command.
Bit 6 is read destructively in response to a VXI Read STB command. Bit 6 is not
read destructively is response to a *STB? query. The Status Byte register is
encoded as follows:
Bit No. Meaning
bit 0 (lsb) Not used
bit 1 Not used
bit 2 Set when the Error/Event queue contains one or more error messages.
bit 3 Not used
bit 4 Set when the Output buffer contains one or more query responses.
bit 5 Set when the contents of the Standard Event Status register ANDed
with the contents of the Standard Event Status Enable register
produces a non-zero result.
bit 6 Set when the contents of bits 0 through 5 and bit 7 of the Status Byte
register ANDed with the contents of the Service Request Enable
register produce a non-zero result.
If bit 6 becomes set, the Option 01 will generate a VXI Request True
interrupt on the VME interrupt level selected by its interrupt level select
switch. If bit 6 becomes set and the Status Byte register is read using a
VXI Read STB command, bit 6 will be reported as being set. In
response to subsequent VXI Read STB commands, bit 6 will be
reported as being cleared.
If bit 6 becomes set and the Status Byte register is read using a *STB?
query, bit 6 will be reported as being set. Bit 6 will continue to be
reported as set in reponse to *STB queries until the contents of bits 0
through 5 and bit 7 of the Status Byte register ANDed with the contents
of the Service Request Enable register is equal to 0.
bit 7 Not used.