Tektronix 2221 - Page 121

Options and Accessories -- 2221 Operators
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Table
7-32
Service Request Group Commands
Commands Description
ALL
OPC < [ ON ] or OFF >
When ON , the oscilloscope sends a service request upon completion of certain
system events ( if RQS is also ON ) . Events that request service when completed
with OPC
ON
include
:
Acquisition
completed
,
and plot
completed
.
When off ,
OPC ( operation completed ) events do not generate a service request . The
power
-
on
state of
OPC is
OFF
.
ALL
RQS < [ ON ] or OFF >
When ON , the
oscilloscope sends a service
request ( SRQ )
when it has an
event
to report . When OFF , event codes of different priority still accumulate and may
be retrieved with an EVEnt ? query , but the reply to STAtus ? will be a 0. The
power - on and default states of RQS are ON .
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1
ALL
EVEnt ?
Returns
an
< NR1 >
value that is
the code
number
for
oldest service -
request
event ( if multiple events are pending ) . If no events are pending , < NR1 > is .
Multiple events of different priority are retrieved by sending EVEnt ? until O is
returned
.
Querying
the
event clears the
service
request
.
on
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