Keithley 7999-6, Инструкция по эксплуатации

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3-12 Operation
Messages in the error queue are stored in a FIFO (First In-First Out) manner. The commands
to read the error queue are listed in Table 3-2. When you read a single message in the error
queue, the “oldest” message is read and then removed from the queue. If the queue becomes
full, the message “350, ‘queue overflow’” will occupy the last memory location. On power-up,
the error queue is empty. When empty, the message “0, No Error” is placed in the queue.
Messages in the error queue are preceded by a code number. Negative (-) numbers are used
for SCPI defined messages, and positive (+) numbers are used for Keithley defined messages.
The error messages are listed in Table 3-8 on page 3-37.
On power-up, all error messages are enabled and will go into the error queue as they occur.
Status messages are not enabled and will not go into the queue. As listed in Table 3-2, there are
commands to enable and/or disable messages. For these commands, the <list> parameter is
used to specify which messages to enable or disable. The messages are specified by their codes.
The following examples show various forms for using the <list> parameter.
<list> = (-110) Single message
= (-110,-222,-220) Comma separated entries
When you enable messages, messages not specified in the list are disabled. When you dis-
able messages, each listed message is removed from the enabled list.
NOTE To prevent all messages from entering the error queue, send the enable command
along with the null list parameter as follows: STATus:QUEue:ENABle ().
For more information on these commands, see the specific command listing in the SCPI
command section.
Table 3-2
SCPI commands — error queue
Command Description Default
STATus
:QUEue
[:NEXT]?
:ENABle<list>
:ENABle?
:DISable<list>
:DISable?
:CLEar
STATus subsystem:
Read error queue:
Read and clear oldest error/status message.
Specify error and status messages for error queue.
Read the enabled messages.
Specify messages not to be placed in queue.
Read the disabled messages.
Clear messages from error queue.
(Note 1)
(Note 2)
(Note 2)
SYSTem
:ERRor?
:CLEar
SYSTem subsystem:
Read error queue:
Clear messages from error queue. (Note 1)
Notes:
1. Power-up and *CLS empties the error queue. STATus:PRESet has no effect.
2. Power-up enables error messages and disables status messages. *CLS and STATus:PRESet have no effect.
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