Xantrex Technology XG 850 manual Scpi Error/Event Queue, Querying For the Errors

Remote Operation

SCPI Error/Event Queue

The error/event queue contains items that include a numerical and textual description of the error or event. Querying for the full queue item (for example, with SYSTem:ERRor[:NEXT]?) will return a response with the following syntax:

<Error/Event Number>, "<Error/Event Description>;<Optional Device Dependent Info>"

The <Error/event_number> is a unique integer in the range [-32768, 32767]. All positive numbers are instrument-dependent. All negative numbers are reserved by the SCPI standard with certain standard error/ event codes described in the SCPI 1999 standard document. The value, zero, is also reserved to indicate that no error or event has occurred.

The second parameter of the full response is a quoted string containing an <Error/event_description> followed by optional <Device-dependent info> text. Each <Error/event_number> has a unique and fixed <Error/ event_description> associated with it.

The maximum string length of <Error/event_description> plus <Device- dependent_info> is 255 characters.

As errors and events are detected, they are placed in a queue. This queue is first in, first out. If the queue overflows, the last error/event in the queue is replaced with error:

-350,"Queue overflow

Any time the queue overflows, the least recent errors/events remain in the queue, and the most recent error/event is discarded. The error queue implemented in the XG is capable of holding 4 errors.

When the error queue is not empty the error queue bit in the Status register will be set.

Querying For the Errors

Executing a query of the event queue will respond with the oldest error currently on the queue. This error is removed. The response format is discussed in the error/event queue description section.

Command:

[:]SYSTem:ERRor[:EVENt]?

5-50 M370078-01