GW Instek GSM-20H10, Руководство пользователя

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GSM-20H10 User Manual
357
The output queue holds data that pertains to the normal
operation of the instrument. For example, when a query
Command is sent, the response message is placed in the Output
Queue. When data is placed in the Output Queue, the Message
Available (MAV) bit in the Status Byte Register sets. A data
message is cleared from the Output Queue when it is read. The
Output Queue is considered cleared when it is empty. An
empty Output Queue clears the MAV bit in the Status Byte
Register. A message is read from the Output Queue by
addressing the SourceMeter to talk after the appropriate query
is sent.
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Error Queue — Used to hold error and status messages.
The Error Queue holds error and status messages. When an
error or status event occurs, a message that defines the
error/status is placed in the Error Queue. When a message is
placed in the Error Queue, the Error Available (EAV) bit in the
Status Byte Register is set. An error/status message is cleared
from the Error Queue when it is read. The Error Queue is
considered cleared when it is empty. An empty Error Queue
clears the EAV bit in the Status Byte Register. The Error Queue
holds up to 10 error/status messages. 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. 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.