User Manual

Series 2200 Programmable DC Power Supplies Reference Manual Appendix C: Status model
2200S-901-01 Rev. A/November 2011 C-3
Registers
The registers in the event reporting system fall into two functional groups:
 Status registers contain information about the status of the power supply. They include the
standard event status register (SESR).
 Enable registers determine whether selected types of events are reported to the status registers
and the event queue. They include the event status enable register (ESER), the service request
enable register (SRER), the operation enable register (OENR), and the questionable enable
register (QENR).
Status registers
This topic describes the following six types of status registers:
 Status byte register (SBR) (on page C-3)
 Standard event status register (SESR) (on page C-4)
 Operation condition register (OCR) (on page C-5)
 Operation event register (OEVR) (on page C-5)
 Questionable condition register (QCR) (on page C-5)
 Questionable event register (QEVR) (on page C-6)
The questionable event register may be filtered by a positive transition filter (Questionable positive
transition register (QPTR) (on page C-6)) and a negative transition filter (Questionable negative
transition register (QNTR) (on page C-6)).
Status byte register (SBR)
The status byte register is made up of 8 bits. Bits 4, 5 and 6 are defined in accordance with IEEE Std
488.2-1992. These bits are used to monitor the output queue, standard event status register, and
service requests, respectively.
Figure 26: Status byte register (SBR)