Output Queue And Error Queue - YOKOGAWA TA520 User Manual

4.5 Output Queue and Error Queue

Overview of the Output Queue
The output queue is provided to store response
messages to queries. For example, when the
query is sent to request output of the
WAVeform:SEND?
acquired waveform, the response data will be stored in
the output queue until it is read out.
The example below shows that data is stored record
by record in the output queue, and is read out oldest
item first, newest item last. The output queue is
emptied in the following cases (in addition to when
read-out is performed).
• When a new message is received from the controller
• When dead lock occurs (page 2-2)
• When a device clear command (DCL or SDC) is
received
• When power is turned ON again
The output queue cannot be emptied using the
command. To see whether the output queue is empty
or not, check bit 4 (MAV) of the status byte.
D1
Overview of the Error Queue
The error queue stores the error No. and message
when an error occurs. For example, when the built-in
battery has run out, an error occurs and its error No.
(901) and message " Backup Failure
the error queue.
The contents of the error queue can be read using the
query. As with the output queue,
STATus:ERRor?
messages are read oldest first, newest last (refer to the
previous page).
If the error queue becomes full, the final message will
be replaced by message 350,
The error queue is emptied in the following cases (in
addition to when read-out is performed).
• When the command is received
*CLS
• When power is turned ON again
To see whether the error queue is empty or not, check
bit 2 (EAV) of the status byte.
IM 704310-12E
*CLS
D2
D1 D2
D1
" will be stored in
" Queue overflow " .
4.5 Output Queue and Error Queue
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