Hioki DSM-8542, Instruction Manual, Page: 106 / 140

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7.11 Status Byte and Events
The DSM-8542 interacts with the service request function and can request services to
the active controller in various event statuses.
The status byte, which is the core of the service request function, is briefly explained
below.
Each bit in a status byte means a summary (logical OR) of events or statuses that use
this bit.
In case a bit means several events or statuses, the enable register masks (enable or
disable) for each event or status before ORing them.
As the MSS (Master Summary Status) bit, the bit in the DIO7 position becomes logical
OR of the seven other bits.
These seven bits are masked by SRER (Service Request Enable Register) before they
are ORed.
SRER is written by the *SRE command and is read out by *SRE? query.
MSS generates an rsv local message, by which RQS is generated. Executing serial
polling reads the status byte and RQS is cleared by the SR function. However, MSS is
not cleared. Therefore, MSS cannot be read by serial polling. (Can be read by an
*STB? query)