14.2.4 *STB?
The Read Status Byte Query reports the contents of the Status Byte Register. The register contains the
summary status of all overlaying registers and status queues. When the Status Byte Register is read by
a serial poll from the GPIB, the RQS bit is returned on bit position 6. The *STB? query returns the MSS
bit on bit position 6. Reading the status byte by a serial poll or with the *STB? query does not affect its
contents. The only exception to this rule is the RQS bit. This bit is always cleared after a serial poll. The
other bits are cleared only when the overlaying status structure, which caused the summary bit or with
*CLS.
Bit MNE Description Status Byte Register
0 DSB
Device
Status
Contains the summary of the Device Status register.
1 DEB
Device
Extended
Status
Contains the summary of the Device Extended status register.
Only used by power supply with internal CPU (SM6000)
2 Not used
3 Not used
4MAV
Message
Available
Indicates the ‘non-empty’ status of the Output Queue; this bit is set
True when at least one byte is available in the queue. It is set to
False when the Output Queue is empty.
5 ESB
Event
Summary Bit
Contains the summary of the Standard Event Status register.
6MSS
Master
Summary
Status.
Returned as a response to the *STB? query. Indicates that there is
an event that caused the device to request for service. The MSS bit
is cleared when the events in the overlaying status structure that
caused the service request, are cleared.
6 RQS
Requested
Service.
Sent as a response to a serial poll over the GPIB. Indicates that the
device requested for service; this means that a SRQ message was
issued on the GPIB. It differs from the MSS bit in the fact that the
RQS bit is cleared after the serial poll. It is only set True again
when a new event occurs that requires service.
7 Not used
For each status structure there is an Event register, that reflects the events themselves, and an Event x
Enable
• Register. The Event Enable register selects which events are summarized into the Status Byte
Register.
• The Status Byte Register can be read by either Serial Poll or by the *STB? query. The Status Byte
Register is cleared only by clearing its overlaying structures.
• The Service Request Enable Register allows to select particular bits from the Status Byte to generate
a Service Request (SRQ) on the GPIB.
page 19 MANUAL May 2008
DELTA ELEKTRONIKA BV PSC SERIES
To Next Page
Loading...
Need help?
General
