User`s guide

Status Reporting
Status, Accumulated Status,
Mask, and Fault Registers
Table 5
below lists the bit
assignments for the Status,
Accumulated Status, Mask, and
Fault Registers and how they
translate between the 662xA
and the N67xxA. The “-CC” bit
will never be set because nega-
tive current cannot be regulat-
ed in the N67xxA modules
6
.
Please see Current Sink
Capabilities in the Electrical
Section for more details.
The “CP+” and “CP-” bits in
the N67xxA output modules
correspond to the output being
in the positive or negative
constant power limit mode
respectively and should not be
confused with the “coupled
parameter” (CP) bit in the
662xA, which indicates range
changes or switching.
Serial Poll and Service
Requests (SRQ)
Serial Poll and Service Requests
(SRQ) will be controlled
according to the SCPI status
model and will not act like a
662xA. Please refer to the
Status Subsystem section in
the Language Dictionary
Chapter of the N67xxA
User’s Guide.
Parallel Poll
Parallel Poll will not work
with the N67xxA.
Model Specific Differences
Full-Scale Limits
All full-scale limits, such as
voltage, current, and power,
will match N67xxA output
module full-scale limits, not
662xA output limits.
Range Switching
40 W/80 W High/Low
Voltage Outputs:
Each output operates within
the specified boundaries of
either the low or high range.
The range is selected based on
the programmed parameters.
If the last parameter (voltage
or current) programmed is
outside of the existing range,
the supply will automatically
switch ranges. When the range
is automatically switched the
“coupled parameter” (CP) bit
in the status register is set to
indicate that range switching
occurred.
11
Bit Position Bit Weight 662xA Meaning N67xxA Meaning
7 128 CP
7
CP
7
664 OCOC
5 32 UNR UNR or CP
7
416 OTOT
3 8 OV OV
2 4 -CC Never Set
6
1 2 +CC +CC
0 1 CV CV
Table 5. Bit Assignment and Translation for Status, A Status, Mask, and Fault Registers
6
The –CC condition does not exist in the N67xxA.
7
Not set on the N675xA modules, see Range Switching at right for more details.