8.4 Communication Methods
106
8.4.3 Status Byte Register
This instrument implements the status model defined by IEEE 488.2
with regard to the serial poll function using the service request line.
The term "event" refers to any occurrence that generates a service
request.
The Status Byte Register contains information about the event
registers and the output queue. Required items are selected from this
information by masking with the Service Request Enable Register.
When any bit selected by the mask is set, bit 6 (MSS; the Master
Summary Status) of the Status Byte Register is also set, which
generates an SRQ (Service Request) message and dispatches a
service request.
bit 7bit 6bit 5bit 4bit 3bit 2bit 1bit 0
unused
SRQ
ESB MAV unused unused ESB1 ESB0
MSS
&&&&&&
bit 7bit 6bit 5bit 4bit 3bit 2bit 1bit 0
unused 0 ESB MAV unused unused ESB1 ESB0
Logical
Status Byte
Register (STB)
Service Request
Enable Register
(SRER)
Service Request
SRQ occurrence
Output Queue data information
Standard Event Register Description
Each of these bits corresponds
to a specific event register
Overview of Service Request Occurrence
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