Keithley 2651A Reference Manual page 596

Section 7: Command reference
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
** >
0 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
2) and Enable and transition registers
meanings:
Bit Value
B0 Not used
B1
status.operation.instrument.trigger_timer.trigger_overrun.TMR1
B2
status.operation.instrument.trigger_timer.trigger_overrun.TMR2
B3
status.operation.instrument.trigger_timer.trigger_overrun.TMR3
B4
status.operation.instrument.trigger_timer.trigger_overrun.TMR4
B5
status.operation.instrument.trigger_timer.trigger_overrun.TMR5
B6
status.operation.instrument.trigger_timer.trigger_overrun.TMR6
B7
status.operation.instrument.trigger_timer.trigger_overrun.TMR7
B8
status.operation.instrument.trigger_timer.trigger_overrun.TMR8
B9- Not used
B15
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
Binary value
Decimal
Weights
7-288
Model 2651A High Power System SourceMeter® Instrument Reference Manual
B13 B12 B11 B10
> > > >
0 0 0 0
(on page E-18). The individual bits of this register have the following
B7 B6
0/1 0/1
128 64
7
(2 ) (2
B9 B8 B7 B6
> > > >
0 0 0 0
B5 B4
0/1 0/1
32 16
6 5 4
) (2 ) (2 )
B5 B4 B3 B2
> > > >
0 1 0 0
Status register sets
Description
Not applicable
Bit B1 decimal value: 2
Bit B2 decimal value: 4
Bit B3 decimal value: 8
Bit B4 decimal value: 16
Bit B5 decimal value: 32
Bit B6 decimal value: 64
Bit B7 decimal value: 128
Bit B8 decimal value: 256
Not applicable
B3 B2 B1
0/1 0/1 0/1
8 4 2
3 2 1
(2 ) (2 ) (2 )
2651A-901-01 Rev. A / March 2011
B1 B0
> *
1 0
(on page E-
B0
0/1
1
0
(2 )