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3
Status Registers
Status Register Examples
24
this condition occurred even if the condition no longer
exists. The event register can only be cleared by querying it
or sending the *CLS command.
• Monitor a particular type of change in a condition (bit).
— The transition registers are preset to register if the
condition goes from 0 to 1 (false to true, or a positive
transition).
— This can be changed so the selected condition is detected
if the bit goes from 1 to 0 (true to false, or a negative
transition).
— It can also be set for both types of transitions occurring.
— Or it can be set for neither transition. If both transition
registers are set to 0 for a particular bit position, that bit
will not be set in the event register for either type of
change.
Each bit in a register is represented by a numerical value
based on its location. See figure below. This number is sent
with the command to enable a particular bit. If you want to
enable more than one bit, you would send the sum of all the
bits that you want to monitor.
Example
1
To enable bit 0 and bit 6 of standard event status register,
you would send the command *ESE 65 because 1 + 64 = 65.
2
The results of a query are evaluated in a similar way. If the
*STB? command returns a decimal value of 140, (140 = 128
+ 8 + 4) then bit 7 is true, bit 3 is true and bit 2 is true.
N9340B Programmer's Guide
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