6241A/6242 DC Voltage Current Source/Monitor Operation Manual
6.5 Status Register Structure
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6.5 Status Register Structure
The 6241A/6242 has a hierarchical status register structure that conforms to the IEEE standard 488.2-1987
and can send various statuses of the 6241A/6242A to the controller. The following explains an operational
model of the status structure and assigning events.
1. Status Register
The 6241A/6242 employs a status register model as defined by the IEEE standard 488.2-1987 that con-
sists of an Event Register and Enable Register.
• Event Register
The Event Register latches and maintains the status for each event. (It may also hold changes.)
Once the register is set, it remains set until it is read out by query or cleared by *CLS.
Data cannot be written into the Event Register.
• Enable Register
The Enable Register specifies for which bits in the Event Register a valid status summary should
be generated. The logical AND operation is executed between Enable Register queries and Event
Register, and the OR result is generated as a summary. The summary is written into the Status Byte
Register.
Data can be written into the Enable Register.
The 6241A/6242 has the following 4 types of status registers.
• Status Byte Register (STB)
• Standard Event Status Register (SESR)
• Device Event Status Register (DESR)
• Error Event Register (ERR)
Event
Register
Enable
Register
0
1
:
:
:
n-1
n
OR
Summary
&
&
&
&
0
1
:
:
:
n-1
n
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