Filter
Top Products
COMMAND REFERENCE 4 - 27
*
STB? Status Byte
Syntax:
*
STB?
Response:
<integer>
Description:
The
*
STB? query reports the contents of the Status Byte register (STB). The range
of the 8-bit STB contents is between 0 and 255 decimal. The Status Byte Register
contains the summary status of all overlaying status registers and queues.
Notes:
- OPER = OPERation status (bit 7)
Contains the summary of the OPERation status register structure.
- RQS = Requested Service (bit 6)
Indicates that the device requests for service, i.e., SRQ=1 in the
GPIB interface. It differs from the MSS bit in that the RQS bit is
cleared after a serial poll. It is set true again only, when a new event
occurs that requires service.
- MSS = Master Summary Status (bit 6)
Indicates that there is an event that causes the device to request
service. The MSS bit is cleared when the event(s) in the overlaying
status structure that caused the Service Request are cleared.
- ESB = Event Summary Bit (bit 5)
Contains the summary of the Standard Event Status register
structure.
- MAV = Message Available (bit 4)
Indicates whether the Output Queue contains at least one message
(bit = 1) or is empty (bit = 0).
- QUES = QUEStionable status (bit 3)
Contains the summary of the QUEStionable status register structure.
- bit 2 = Error/Event queue bit
Indicates whether the Error/Event queue contains at least one
message (bit = 1) or is empty (bit = 0).
- bit 1 = Device Dependent Status bit (not used)
- bit 0 = Device Dependent Status bit (not used)
Example:
Send
→ *STB?
Read
← 4 4 is equal to the binary value #B100. This means that bit 2 is set,
indicating that there is an error message in the Error/event Queue.