Anritsu MT9812B, Руководство по эксплуатации, Страница: 104 / 144

Section 5 Remote Control
5-36
Table 5-9 Comparison of Output Queue to General Queues
Item Output queue Queue
Data input/output type
Read
Write
Summary message
Clearing
FIFO type
Response message units are read using only
an IEEE 488.2 message exchange protocol.
The type of these response message units
depends on the query type.
Program message elements are not written
directly.
This queue communicates with the system
interface using only an IEEE 488.2 message
exchange protocol.
When the output queue is not empty, the sum-
mary message bit becomes True (1).
When it is empty, the summary message bit
becomes False (0).
The MAV summary message is used to syn-
chronize information exchange between a
device and the controller.
This queue is cleared in the following cases:
(a) All items in the queue are read.
(b) A DCL bus command is received for mes-
sage exchange.
(c) The PON bit becomes True at Power-ON.
(d) Operation is unterminated or interrupted.
Not necessary to be FIFO type
Response message units are read with
device-dependent query commands.
These response message units must be of
the same type.
Program message elements are not writ-
ten directly.
Coded device information is indicated.
When the queue is not empty, the
summary message bit becomes True (1).
When it is empty, the summary message
bit becomes False (0).
This queue is cleared in the following
cases:
(a) All items in the queue are read.
(b) A
∗
CLS command is received.
(c) Other device-dependent means