4
3. An EOI (End Or Identify) sent with any character is put into the input queue
as the character followed by a line feed (LF,0A
16
). If EOI is sent with a LF,
only one LF is put into the input queue.
4. The parser starts if the LF character is received or if the input queue is full.
Clearing the Input Queue
Switching the power o, or sending a Device Interface Clear signal, causes
commands that are in the input queue, but have not been executed to be lost.
The Output Queue
The output queue contains responses to query messages. The tunable laser
source transmits any data from the output queue when a controller addresses
the instrument as a talker.
Each response message ends with a carriage return (CR, 0D
16
) and a LF (0A
16
),
with EOI=TRUE. If no query is received, or if the query has an error, the
output queue remains empty.
The Message Available bit (MAV, bit 4) is set in the Status Byte register
whenever there is data in the output queue.
The Error Queue
The error queue is 30 errors long. It is a FIFO queue (rst-in rst-out). That is,
the rst error read is the oldest error to have occurred. A new error is only put
into the queue if it is not already in it.
If more than 29 errors are put into the queue, the message '-350
<
Queue
Overow
>
' is placed as the last message in the queue.
4-4 Remote Operation
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