Model 2651A High Power System SourceMeter® Instrument Reference Manual
Section 7: Command reference
2651A-901-01 Rev. A / March 2011
7-263
Details
This attribute is used to read or write to the system node enable register. Reading the system node enable
register returns a value. The binary equivalent of the value indicates which register bits are set. In the binary
equivalent, the least significant bit is bit B0, and the most significant bit is bit B7. For example, assume the value
of
1.02
(which is 129) is returned for the system node enable register, the binary equivalent is
1000 0001. This value indicates that bit B0 and bit B7 are set.
B7 B6 B5 B4 B3 B2 B1 B0
** > > > > > > **
1
0
0
0
0
0
0
1
* Least significant bit
** Most significant bit
Assigning a value to this attribute enables one or more status events. When an enabled status event occurs, a
summary bit is set in the appropriate system summary register. The register and bit that is set depends on the
TSP-Link node number assigned to this instrument.
For information about .condition, .enable, .event, .ntr, and .ptr registers, refer to
(on page E-
Enable and transition registers
(on page E-18). The individual bits of this register have the following
meanings:
Bit Value
Description
B0
status.MEASUREMENT_SUMMARY_BIT
status.MSB
Set summary bit indicates that an enabled measurement
event has occurred.
Bit B0 decimal value: 1
B1 Not
used
Not applicable.
B2
status.ERROR_AVAILABLE
status.EAV
Set summary bit indicates that an error or status message
is present in the Error Queue.
Bit B2 decimal value: 4
B3
status.QUESTIONABLE_SUMMARY_BIT
status.QSB
Set summary bit indicates that an enabled questionable
event has occurred.
Bit B3 decimal value: 8
B4
status.MESSAGE_AVAILABLE
status.MAV
Set summary bit indicates that a response message is
present in the Output Queue.
Bit B4 decimal value: 16
B5
status.EVENT_SUMMARY_BIT
status.ESB
Set summary bit indicates that an enabled standard event
has occurred.
Bit B5 decimal value: 32
B6
status.MASTER_SUMMARY_STATUS
status.MSS
Set bit indicates that an enabled Master Summary Status
(MSS) bit of the Status Byte Register is set.
Bit B6 decimal value: 64
B7
status.OPERATION_SUMMARY_BIT
status.OSB
Set summary bit indicates that an enabled operation event
has occurred.
Bit B7 decimal value: 128
As an example, to set the B0 bit of the system node enable register, set
status.node_enable =
status.MSB
.
In addition to the above values,
nodeEnableRegister
can be set to the numeric equivalent of the bit to set. To
set more than one bit of the register, set
nodeEnableRegister
to the sum of their decimal weights. For
example, to set bits B0 and B7, set
nodeEnableRegister
to 129 (1 + 128).
