Model 2651A High Power System SourceMeter® Instrument Reference Manual
Section 7: Command reference
2651A-901-01 Rev. A / March 2011
7-309
B7 B6 B5 B4 B3 B2 B1 B0
** > > > > > > *
1
0
0
0
0
0
0
1
* Least significant bit
** Most significant bit
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 event in the
Measurement Event Register has occurred.
Bit B0 decimal value: 1
B1
status.SYSTEM_SUMMARY_BIT
status.SSB
Set summary bit indicates that an enabled event in the
System Summary Register has occurred.
Bit B1 decimal value: 2
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 event in the
Questionable Status Register 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 event in the
Standard Event Status Register has occurred.
Bit B5 decimal value: 32
B6
Not used.
Not applicable.
B7
status.OPERATION_SUMMARY_BIT
status.OSB
Set summary bit indicates that an enabled event in the
Operation Status Register has occurred.
Bit B7 decimal value: 128
As an example, to set bit B0 of the service request enable register, set
status.request_enable =
status.MSB
.
In addition to the above values,
requestSRQEnableRegister
can be set to the numeric equivalent of the bit
to set. To set more than one bit of the register, set
requestSRQEnableRegister
to the sum of their decimal
weights. For example, to set bits B0 and B7, set
requestSRQEnableRegister
to 129 (1 + 128).
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
)
Example 1
requestSRQEnableRegister = status.MSB +
status.OSB
status.request_enable = requestSRQEnableRegister
Sets the MSB and OSB bits of the
service request (SRQ) enable register
using constants.
