Tektronix KEITHLEY 2200 Series, Programming Reference Manual, Page: 75 / 104

Status and Events
Table 3-8: QISUR bit functions (cont.)
Bit Function
2
———— This bit is not used.
1
———— This bit is not used.
0
———— This bit is not used.
*PSC Command The *PSC command controls the Enable Register contents at power-on. Sending
*PSC 1 sets the Enable Registers at power on as follows:
ESER 0 (equivalent to an *ESE 0 command)
SRER 0 (equivalent to an *SRE 0 command)
Sending *PSC 0 lets the Enable Registers maintain their values in nonvolatile
memory through a power cycle.
Queues
Output Queue The power supply stores query responses in the Output Queue and empties this
queue each time it receives a new command or query message after an <EOM>.
The controller must read a query response before it sends the next command (or
query) or it will lose responses to earlier queries.
Error/Event Queue The Event Queue stores detailed information on up to 32 events. When 32 events
stack up in the Event Queue, the 32nd event is replaced by event code 350,
"Queue Over
fl ow."
Read the Event Queue with the EVENT? query (which returns only the event
number), with the EVMSG? query (which returns the event number and a text
description of the event), or with the ALLEV? query (which returns all the event
numbers with a description of the event). Reading an event removes it from the
queue.
Before reading an event from the Event Queue, you must use the *ESR? query to
read the summary of the event from the SESR. This makes the events summarized
by the *ESR? read available to the EVENT? and EVMSG? queries, and empties
the SESR.
Reading the SESR erases any events that were summarized by previous *ESR?
reads but not read from the Event Queue. Events that follow an *ESR? read are
put in the Event Queue but are not available until *ESR? is used again.
Series 2200 Programmable Multichannel DC Power Supplies Programmer Manual 3-9