Chapter 3 137
Programming the Status Register System
Status Groups
Data Questionable Transition Filters (negative and positive)
The Data Questionable Transition Filters specify which type of bit state changes in the condition register set
corresponding bits in the event register. Changes can be positive (0 to 1) or negative (1 to 0).
Data Questionable Event Register
The Data Questionable Event Register latches transition events from the condition register as specified by
the transition filters. Event registers are destructive read-only: reading data from an event register clears the
contents of that register.
Data Questionable Event Enable Register
The Data Questionable Event Enable Register lets you choose which bits in the Data Questionable Event
Register set the summary bit (bit 3 of the Status Byte Register) to 1.
Query: STATus:QUEStionable:CONDition?
Response: The decimal sum of the bits that are set to 1
Example: The decimal value 520 is returned. The decimal sum = 512 (bit 9) + 8 (bit 3).
Commands:
STATus:QUEStionable:NTRansition <value> (negative transition), or
STATus:QUEStionable:PTRansition <value> (positive transition), where
<value> is the sum of the decimal values of the bits you want to enable.
Queries:
STATus:QUEStionable:NTRansition?
STATus:QUEStionable:PTRansition?
Query: STATus:QUEStionable[:EVENt]?
Command:
STATus:QUEStionable:ENABle <value> command where <value> is the sum of the
decimal values of the bits you want to enable.
Example: Enable bit 9 and bit 3 so that whenever either of those bits is set to 1, the Data Questionable
Status summary bit of the Status Byte Register is set to 1:
send the command STAT:QUES:ENAB 520 (512 + 8)
Query: STATus:QUEStionable:ENABle?
Response: Decimal value of the sum of the bits previously enabled with the
STATus:QUEStionable:ENABle <value> command.
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