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*STB?
Bit
0
1
2
3
4
5
6
7
Returned Data
Comments
Reset Condition
Related
Commands
182 Programming the Enhanced Monitor
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*STB? query returns the value of the event register for the Status Byte status group.
The Status Byte is used to summarize information from all other status groups.
The event register latches transition events from the condition register as specified
by the transition filter. Only the positive transition filter is active in the module. This
means that a transition event will occur when a condition makes a transition from a
low to a high state. Bits in the event register are latched, and once set, they remain
set until cleared by a *STB? query or *CLS (clear status). There is no buffering; so
while an event bit is set, subsequent events corresponding to that bit are ignored.
Event registers are read only.
The following table describes each bit in the Status Byte status group:
Not Used
Not Used
Error query summary bit. When set, indicates the error queue is not
empty.
Summary bit from the Questionable Data status group (QUE)
Messages available in the Output Queue (MAV)
Summary bit from the Standard Event status group (ESB)
Service Request (RQS)
Summary bit from the Standard Operation status group (OPR)
Type Range Default
int16
0 - 255
none
Bit mask indicating which events are set (1) or cleared (0) in the
Status Byte status group.
•
The Status Byte can be read using either *STB? or by a serial poll. There are
some subtle differences between *STB? and serial polling. You can use either
method to read the state of bits 0-5 and bit 7. Bit 6 is treated differently
depending on whether you use *STB? or serial poll. In general, use serial
polling inside interrupt service routines, not a *STB?.
*RST does not affect the status system
*SRE
Description
Description
Decimal Value
1
2
4
8
16
32
64
128
Chapter 3
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