Keithley 2010

5-66 SCPI Command Reference
:ERRor? command
:ERRor?
:SYSTem:ERRor? Read Error Queue
Description As error and status messages occur, they are placed in the Error Queue. This
query command is used to read those messages. The Error Queue is a first-in,
first-out (FIFO) register that can hold up to ten messages. Each time you read
the queue, the “oldest” message is read, and that message is then removed
from the queue.
If the queue becomes full, the “350, Queue Overflow” message occupies the
last memory location in the register. On power-up, the queue is empty. When
the Error Queue is empty, the “0, No error” message is placed in the Error
Queue.
The messages in the queue are preceded by a number. Negative (-) numbers
are used for SCPI defined messages, and positive (+) numbers are used for
Keithley defined messages. Appendix B lists the messages.
NOTE The :SYSTem:ERRor? query command performs the same
function as the :STATus:QUEue? query command (see STATus
subsystem).