Section 7: Command reference
Model 2651A High Power System SourceMeter® Instrument Reference Manual
7-288
2651A-901-01 Rev. A / March 2011
Details
These attributes are used to read or write to the operation status trigger timer overrun registers. Reading a status
register returns a value. The binary equivalent of the returned value indicates which register bits are set. The
least significant bit of the binary number is Bit B0, and the most significant bit is Bit B15. For example, if a value
of
18
is read as the value of the condition register, the binary equivalent is 0000 0000 0001 0010. This value
indicates that bit B1 and bit B4 are set.
B15 B14 B13 B12 B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0
** > > > > > > > > > > > > > > *
0
0
0
0
0
0
0
0
0
0
0
1
0
0
1
0
* Least significant bit
** Most significant bit
A set bit indicates the specified timer generated an action overrun because it was still processing a delay from a
previous trigger when a new trigger was received.
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 Not
used
Not applicable
B1
status.operation.instrument.trigger_timer.trigger_overrun.TMR1
Bit B1 decimal value: 2
B2
status.operation.instrument.trigger_timer.trigger_overrun.TMR2
Bit B2 decimal value: 4
B3
status.operation.instrument.trigger_timer.trigger_overrun.TMR3
Bit B3 decimal value: 8
B4
status.operation.instrument.trigger_timer.trigger_overrun.TMR4
Bit B4 decimal value: 16
B5
status.operation.instrument.trigger_timer.trigger_overrun.TMR5
Bit B5 decimal value: 32
B6
status.operation.instrument.trigger_timer.trigger_overrun.TMR6
Bit B6 decimal value: 64
B7
status.operation.instrument.trigger_timer.trigger_overrun.TMR7
Bit B7 decimal value: 128
B8
status.operation.instrument.trigger_timer.trigger_overrun.TMR8
Bit B8 decimal value: 256
B9-
B15
Not used
Not applicable
As an example, to set bit B1 of the operation status trigger timer trigger overrun enable register, set
status.operation.instrument.trigger_timer.trigger_overrun.enable =
status.operation.instrument.trigger_timer.trigger_overrun.TMR1
.
In addition to the above constants,
operationRegister
can be set to the numeric equivalent of the bit to set.
To set more than one bit of the register, set
operationRegister
to the sum of their decimal weights. For
example, to set bits B1 and B4, set
operationRegister
to 18 (which is the sum of 2 + 16).
Bit
B7 B6 B5 B4 B3 B2 B1 B0
Binary
value
0/1 0/1 0/1 0/1 0/1 0/1 0/1 0/1
Decimal
128 64 32 16 8 4 2 1
Weights (2
7
) (2
6
) (2
5
) (2
4
) (2
3
) (2
2
) (2
1
) (2
0
)
