Sorensen MML Series Operation and Programming Manual
5-50
5.11 Status Reporting
5.11.1 Introduction
This section discusses the status data structure of the MML series electronic load as
shown in Figure 5-2. 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 of the electronic load. The Channel Status and Channel
Summary groups are used by multiple channel of electronic load to enable status
information to be kept at its own Status register of each channel.
5.11.2 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 sets the bits in the
Event register. Channel Status and 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 the register (all bits are 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.
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