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1269 User Manual
Using The Enhanced Monitoring System 4-36
bit assignments are defined by the IEEE-488.2
specification. The bit assignments are as follows:
Bit 0 - Operation Complete. This bit is set when the
*OPC command is sent and has been
executed.
Bit 1 - Request Control. This bit is always 0 for the
1269 EMS.
Bit 2 - Query Error. This bit is set when the EMS
parser has detected a query error condition,
as defined by the IEEE-488.2 specification.
Bit 3 - Device Dependent Error. This bit is set when
the EMS has detected a Device Dependent
error, such as an internal conflict or a self-test
failure at power-on.
Bit 4 - Execution Error. This bit is set when the EMS
has attempted to execute a command but the
command could not be executed successfully.
Bit 5 - Command Error. This bit is set when the EMS
receives a command it does not recognize.
Bit 6 - User Request. This bit is always 0 for the
1269 EMS.
Bit 7 - Power On. This bit is set when the AC line
power switch is turned on
The bits of the Standard Event Status Register are cleared
after this query has been executed. The reply to the *ESR?
query is a numeric integer value in the range “0" to “255".
*SRE Command
The *SRE command sets the value of Service Request
Enable Register. The value of this register is logically
ANDed with the contents of the Status Byte (see the *STB?
query description). If any bits of this AND operation are set,
bit 6 of the Status Byte is set. That is:
bit 6 of Status Byte = (bit 0 of SRE AND bit 0 of STB)
OR
(bit 1 of SRE AND bit 1 of STB)
OR
(bit 2 of SRE AND bit 2 of STB)
OR
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