IEEE-488 Reference
4-46
Programming Example 10 OUTPUT 716; “*SRE?” ! Request contents of SRER
20 ENTER 716; A$ ! Address 2001 to talk
30 PRINT A$ ! Display value register
4.0.14 *STB? status byte query
Purpose To read the contents of the Status Byte Register.
Format *STB?
Description The *STB? query command is used to acquire the value (in decimal) of the Status Byte Register.
The Status Byte Register is shown in Figure 4-18. The binary equivalent of the decimal value
determines which bits in the register are set. The set bits in this register define the operating sta-
tus of the Model 2001.
When the *STB? query command is sent, the decimal value is placed in the Output Queue.
When the Model 2001 is addressed to talk, the value is sent from the Output Queue to the com-
puter.
All bits, except Bit 6, in this register are set by other event registers and queues. Bit 6 sets when
one or more enabled conditions occur.
The *STB? query command does not clear the status byte register. This register can only be
cleared by clearing the related registers and queues. Register and queue structure are explained
in paragraph 4.6.
For example, for an acquired decimal value of 48, the binary equivalent is 00110000. This binary
value indicates that Bits 4 and 5 of the Status Byte Register are set.
The bits of the Status Byte Register are described as follows:
Bit 0, Measurement Status (MSB) Set bit indicates that a measurement event has occurred.
The event can be identified by reading the Measurement Event Status Register using the :STA-
Tus:MEASurement? command (see paragraph 4.21 for details).
Bit 1 Not used.
Bit 2, Error Available (EAV) Set bit indicates that an error or status message is present in
the Error Queue. The message can be read using one of the following SCPI commands:
:SYSTem:ERRor?
:STATus:QUEue?
See paragraphs 4.21 and 4.22 for details.
Bit 3, Questionable Summary Bit (QSB) Set bit indicates that a calibration error has oc-
curred.
Bit 4, Message Available (MAV) Set bit indicates that a message is present in the Output
Queue. The message is sent to the computer when the Model 2001 is addressed to talk.
Bit 5, Event Summary Bit (ESB) Set bit indicates that a standard event has occurred. The
event can be identified by reading the Standard Event Status Register using the *ESE? query
command (see paragraph 4.10.3).
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