The input buffer and the output queue


Input buffer


The instrument has a 2048-byte input buffer.
Received messages are put into this buffer and executed in order.
However, "ABORT" commands are executed immediately when received.

Output queue


The instrument has a 2048-byte output queue. Response messages accumulate in this queue until read out by the controller (PC). A query error occurs if the length of a response message exceeds 2048 bytes.

The following events clear the output queue:

  1. When the controller has read out the entire contents.
  2. When a device clear command is issued.
  3. When power is turned off and on again.
  4. Upon receipt of the next message.