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HP-IB Programming
Standard STATUS Commands
8.4
Standard STATUS Commands
This section gives a list of the OLA-commands and queries used for
determining the status of the instrument.
General Remarks
The OLA uses two “nodes” which describe the status of the
instrument:
•
The OPERation node shows things that can happen during
normal operation.
•
The QUEStionable node shows error conditions.
The Status Registers and Filters
Each node consists of five 16-bit-registers:
•
The CONDition register, which contains the current status. This
register is continuously updated.
•
The EVENt register, which contains the filtered status of the
CONDition register. This register is cleared when it is read.
•
The PTRansition register is one of the two filters controlling the
EVENt register: It puts, when enabled, a 1 into the EVENt
register when the corresponding bit in the CONDition register
changes from 0 to 1. At power-on, all bits of this register are
enabled.
•
The NTRansition register is the second of the filters controlling
the EVENt register: It puts, when enabled, a 1 into the EVENt
register when the corresponding bit in the CONDition register
changes from 1 to 0. At power-on, all bits of this register are
disabled.
•
The ENABle register, which enables changes in the EVENt
register to affect the Status Byte.
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