Hioki SM7860 Series, Instruction Manual

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30
Communication Method
Status Byte Register
RS-232C
: RS-232C reads the status bytes to find out the status of the device.
GP-IB
: The device adopts the IEEE488.1-1987 defined status model for parts related to the serial
polling performed by the service request function. A trigger for generating a service request is
called an event.
Overview of Service Request Occurrence
Service request
occurrence
Standard event register information
Output queue data information
Each of these bits corresponds
to a specific event register
bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0
ERR
RQS
ESB MAV DSB unused 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
ERR × ESB MAV DSB unused 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.
For RS-232C, bit 4 (MAV message available) of the status byte register is not set.