Status and Events
Use the *SRE com
mand to set the SRER. Use the *SRE? query to read the
register. The RQS bit remains set to one until either the Status Byte Register is
read with a Serial Poll or the MSS bit changes back to a zero.
Figure 3-5: The Service Request Enable Register (SRER)
*PSC Command
The *PSC command controls the Enable Registers contents at power-on. Sending
*PSC 1 sets the Enable Registers at power on as follows:
DESER 255 (equivalent to a DESe 255 command)
ESER 0 (eq
uivalent to an *ESE 0 command)
SRER 0 (equivalent to an *SRE 0 command)
Sending *PSC 0 lets the Enable Registers m aintain their values in nonvolatile
memory through a power cycle.
NOTE. T
o enable the PON (Power On) event to generate a Service Request, send
*PSC 0, use the DESe and *ESE commands to enable PON in the DESER and
ESER, and use the *SRE command to enable bit 5 in the SRER. Subsequent
power-on cycles will generate a Service Request.
Queues
Output Queue
The oscilloscope stores query responses in the Output Queue and empties this
que
ue 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.
CAUTION. When a controller sends a query, an <EOM>, and a second query,
the oscilloscope normally clears the first response and outputs the second while
reporting a Query Error (QYE bit in the ESER) to indicate the lost response. A
fast controller, however, may receive a part or all of the firstresponseaswell.To
avoid this situation, the controller should always read the response immediately
after sending any terminated query message or send a DCL (Device Clear) before
sending the second query.
Event Queue
The Event Queue stores detailed information on up to 128 events. If more than
128 events stack up in the Event Queue, the 128th event is replaced by event
code 350, "Queue Overflow."
3-4 MSO2000B, DPO2000B, MSO2000 and DPO2000 Series Oscilloscopes Programmer Manual
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