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4-2
Root Level Commands
AEEN
Root Level Commands
Root level commands control many of the basic operations of the analyzer that can be
selected by pressing the labeled keys on the front panel. These commands are always recog-
nized by the parser if they are prefixed with a colon, regardless of the current tree position.
After executing a root level command, the parser is positioned at the root of the command
tree. For any of the Standard Event Status Register bits to generate a summary bit, the bits
must be enabled. These bits are enabled by using the *ESE common command to set the cor-
responding bit in the Standard Event Status Enable Register. URQ in the Event Status Regis-
ter always returns 0. To generate a service request (SRQ) interrupt to an external computer,
at least one bit in the Status Byte Register must be enabled. These bits are enabled by using
the *SRE common command to set the corresponding bit in the Service Request Enable Reg-
ister. These enabled bits can then set RQS and MSS (bit 6) in the Status Byte Register. In the
SRE query, bit 6 always returns 0. Various root level commands documented in this chapter
query and set various registers within the register set.
AEEN
Command :AEEN <mask>
This command sets a mask into the Acquisition Limits Event Enable register. A “1” in a bit
position enables the corresponding bit in the Acquisition Limits Event Register to set bit 9 in
the Operation Status Register. The <mask> argument is the decimal weight of the enabled
bits. Only bits 0 through 4 of the Acquisition Limits Event Enable Register are used at this
time. Table 4-1 shows the enabled bits for some useful example mask values. Bits that are not
marked as enabled by the mask are blocked from affecting the operation status register.
Query :AEEN?
The query returns the current decimal value in the Acquisition Limits Event Enable register.
Returned Format [:AEEN] <mask><NL>