C-16 Return to Section Topics 2600AS-901-01 Rev. B / September 2008
Appendix C: Status Model Series 2600A System SourceMeter® Instruments Reference Manual
Enable and transition registers
In general, there are three types of user-writable registers that are used to configure which bits
feed the register summary and when it occurs. The registers are identified in the command table
footnotes as follows:
• Enable register (identified as “enable” in the table footnotes): allows various associated
events to be included in the summary bit for the register.
• Negative-transition register (NTR; identified as “ntr” in the table footnotes): a particular bit in
the event register will be set when the corresponding bit in the NTR is set, and the
corresponding bit in the condition register transitions from 1 to 0.
• Positive-transition register (PTR; identified as “ptr” in the table footnotes): a particular bit in
the event register will be set when the corresponding bit in the PTR is set, and the
corresponding bit in the condition register transitions from 0 to 1.
Controlling node and SRQ enable registers
Attributes to control system node and SRQ enable bits and read associated registers are
summarized in the
Status register sets. For example, either of the following will set the system
node MSB enable bit:
status.node_enable = status.MSB
status.node_enable = 1
Table C-3
Status Byte and Service Request Enable Register commands
Command Description
*STB?
or
print(status.condition)
Read Status Byte Register.
*SRE <mask>
or
status.request_enable = <mask>
Program the Service Request Enable Register:
<mask> = 0 to 255
*SRE?
or
print(status.request_enable)
Read the Service Request Enable Register.
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