Anritsu MT9812B, Operation Manual, Page: 93 / 144

5-25
Remote Control
5
(2) Status byte (STB) register and service request enable (SRE) reg-
ister
The status byte register consists of an RQS bit and seven summary message
bits for setting status summary messages from the status data structure. It is
used in combination with a service request enable register. When the result
of ORing the values of these two registers is 0, the SRQ is set ON. In this
case, the status byte register bit "DIO 7" is reserved by the system as an RSQ
bit, so this bit indicates to an external controller that a service request exists.
The function of the SRQ conforms to IEEE 488.1.
(3) Output queue
This queue has the queue model structure mentioned above. Its contents are
summarized and transferred to the status byte register bit 4 (DIO 5) as a
MAV (message available) summary message.
5.4 IEEE 488.2 Standard Status Model