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Handling SRQ and the IEEE488.2 Status Structures
Remote communication time out
The Remote Communications Time Out bit is the only element of this part of the Status
Structure.
The bit is set to 1 when the Time Out mechanism is enabled and a Time Out event occurs.
Primary engine status structure
The Status Structure associated with the Primary Engine of the XMP 2600 is made out of
the Primary Status Register, a fixed positive Mask Register, the Primary Event Status
Register and the Primary Event Status Enable Register.
The summary bit of this Status Structure (the PRIM ERR bit) will be set when Primary
events are registered in the Primary Event Status Register and the corresponding bits of
the Primary Event Status Enable Register are set. Note that the Primary Event Status
Register records only occurrences of conditions and does not register anything when a
condition is removed (this is the work of the positive Mask Register).
If the PRIM ERR bit was read as 1, the Primary Event Status Register should be read
(using the PER? Query). This will reveal what Primary event has occurred since the
register was last read.
The actual status of the Primary Engine can be obtained using the PSR? Query.
Summary of power modules status
Each of the Power Modules in the XMP 2600 system has its own Status Structure. The
summary bits of those Status Structures are grouped in a 16-bit register (read as two 8 bit
registers) called the Power Modules Summary Register.
This register (read with the SRQS? Query) is summarized in the Status Byte as the SRQ
IS bit.
The SRQ IS bit will be set whenever one of the bits of the Power Modules Summary
Register is changed to 1.
The content of the Power Modules Summary Register is cleared when the controlling
computer reads the register.
Bits of the Power Modules Summary Register are set when Power Modules events seep
through the filters of the Power Modules Status Structures.
When the SRQ IS bit of the Status register was read as 1, the Power Modules Summary
Register should be read. For each set bit in the Power Modules Summary Register the
corresponding Power Modules Status Structure should be explored.
Power modules status structure
The Status Structure of the Power Modules is made out of the following elements:
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•
•
•
The summary bit of the entire structure is read at the Power Modules position in the
Power Modules Summary Register (e.g. the summary bit of module number 3 will be
evident at bit 2 of the summary register [bits are counted starting with 0]).
The Power Module Status Structure is read as a whole using the CSTS? Query.
14
Status Registers – Warnings, Output state, Faults, Error Code and general
Status.
Mask Registers – some are fixed and some are programmable.
Event Register.
Event Enable Register.
XMP 2600 Programming Manual
Usage Guidelines
rev. 1.1
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