Keithley 2651A Reference Manual

Appendix E: Status model Model 2651A High Power System SourceMeter® Instrument Reference Manual
E-18 2651A-901-01 Rev. A / March 2011
Status Byte and Service Request Enable Register commands
Command Description
*STB?
or
print(status.condition)
Read the Status Byte Register.
*SRE <mask>
or
status.request_enable = <mask>
Program the Service Request Enable Register where
<mask> = 0 to 255.
*SRE?
or
print(status.request_enable)
Read the Service Request Enable Register.
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 bit and when it occurs. The registers are identified in each applicable Command
reference (see "Commands" on page 7-8) command table and defined as follows:
• Enable register (identified as .enable in each attribute's command listing): Allows various
associated events to be included in the summary bit for the register.
• Negative-transition register (identified as .ntr in each attributes command listing): 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 (identified as .ptr in each attributes command listing): 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 service request (SRQ) enable bits and read associated
registers are summarized in the Status Byte Register overview
(on page E-4). For example, either of
the following will set the system node QSB enable bit:
status.node_enable = status.QSB
status.node_enable = 8
Status register sets
There are five status register sets in the status structure of a High Power System SourceMeter
®
Instrument:
• System Summary
• Standard Event Status
• Operation Status
• Measurement Event
• Questionable Status

Keithley 2651A Specifications

General

Brand	Keithley
Model	2651A
Category	Measuring Instruments
Language	English