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6.
Status Reporting
6.1 Introduction
This chapter explains the status data structure of Chroma 63600 Series electronic load as
shown in Figure 6-1 (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 the 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. The Channel Status and
Channel Summary groups are used by multiple channel electronic loads to enable the status
information that will be kept at its own Status register for each channel.
6.2 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. Channel Status, Questionable Status allow transitions to be programmed. Other
register groups, i.e. Channel Summary, Standard Event Status register group use an implied
Rise (0-to-1) condition transition to set bits in the Event register. Reading an Event register
clears it (all bits set to zero).
Enable register
■
The Enable register can be programmed to enable the bit that the corresponding Event
register is logically ORed into the Channel Summary.
Status Reporting
6-1
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