Hioki SW9001, Instruction Manual

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77
Communication Method
Status Byte Register
This device 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.
Overview of service request occurrence
Standard Event Register information
Service
Request (SRQ)
occurrence
Output Queue data information
Event Register information for
each bit
bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0
ESB1
SRQ
ESB MAV ESB0 ERR Unused Unused
Status Byte Register
(STB)
MSS
Logical sum & & & & & &
bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0
ESB1 0 ESB MAV ESB0 ERR Unused Unused
Service Request
Enable Register
(SRER)
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.
8
Communication Function
HIOKI SW1001A961-04