Status Reporting
8. Status Reporting
8.1 Introduction
This chapter covers the status data structure of Chroma 63200 series electronic load as shown
in Figure 8-1(on the next page). The standard registers, such as the Event Status register
group, the Output Queue, the Status Byte and Service Request Enable registers perform
standard GPIB functions and are defined in IEEE-488.2 Standard Digital Interface for
Programmable Instrumentation. Other status register groups implement the specific status
reporting requirements for the electronic load.
8.2 Register Information in Common
■ Condition register
The condition register represents the present status of electronic load signals. Reading the
condition register does not change the state of its bits. Only changes in electronic load
conditions affect the contents of this register.
PTR/NTR Filter, Event register
The Event register captures changes in conditions corresponding to condition bits in a
condition register, or to a specific condition in the electronic load. An event becomes true
when the associated condition makes one of the following electronic load-defined transitions:
Positive TRansition (0 - to - 1)
Negative TRansition (1 - to - 0)
Positive or Negative TRansition (0-to-1 or 1-to-0)
The PTR/NTR filters determine what type of condition transitions set the bits in the Event
register. Questionable Status allows transitions to be programmed. Standard Event Status
register group uses an implied Rise (0-to-1) condition transition to set bits in the Event
register. Reading an Event register clears the register (all bits set to zero).
Enable register
The Enable register can be programmed to enable which bit in the corresponding Event
register is logically ORed into the Channel Summary bit.
8-1
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