32 Command Reference Chapter 3
• The output queue
• The Service Request Enable Register
• The Standard Event Status Enable Register
• The power-on flag
• Calibration data
• Protected user data
*SRE <
mask>
Service Request Enable. When a service request event occurs, it sets a
corresponding bit in the Status Byte Register (this happens whether or not the event
has been enabled (unmasked) by *SRE). The *SRE command allows you to identify
which of these events will assert a service request (SRQ). When an event is enabled
by *SRE and that event occurs, it sets a bit in the Status Byte Register and issues an
SRQ to the computer. You enable an event by specifying its decimal weight for
<mask>. To enable more than one event, specify the sum of the decimal weights.
Example *SRE 160
Enables bits 5 & 7. Respective weights
are 32 + 128 = 160.
*SRE?
Status Register Enable Query. Returns the weighted sum of all enabled
(unmasked) events (those enabled to assert SRQ) in the Status Byte Register.
Example *SRE?
Sends Status Register Enable query.
*STB?
Status Byte Register Query. Returns the weighted sum of all set bits in the Status
Byte Register.
Comments You can read the Status Byte Register using either the *STB? command or by doing
a SICL ireadstb function call. There are some subtle differences between *STB? and
ireadstb. You can use either method to read the state of bits 0-5 and bit 7. Bit 6 is
treated differently depending on whether you use *STB? or ireadstb. In general, use
ireadstb inside interrupt service routines, not *STB?.
Example *STB?
Sends Status Byte Register query.
*TST?
Self-Test. Causes an instrument to execute an internal self-test and returns a
response showing the results of the self-test. A zero response indicates that self-test
passed. A value other than zero indicates a self-test failure or error.
Example *TST?
Execute self-test, return response.
