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User Manual 3155
Standard Event
Status Enable Regis-
ter (ESE)
Error Messages
The Standard Event Status Enable Register allows one or more
events in the Standard Event Status Register to be reflected in the
ESB summary message bit. The Standard Event Status Enable
Register is an 8-bit register that enables corresponding summary
messages in the Standard Event Status Register. Thus, the appli-
cation programmer can select reasons for the generator to issue an
ESB summary message bit by altering the contents of the ESE
Register.
The Standard Event Status Enable Register is read with the *ESE?
Common query. The response to this query is a number that repre-
sents the sum of the binary-weighted value of the Standard Event
Status Enable Register.
The Standard Event Status Enable Register is written using the
*ESE command followed by a decimal value representing the bit
values of the Register. A bit value one indicates an enabled condi-
tion. Consequently, a bit value of zero indicates a disabled condi-
tion. The Standard Event Status Enable Register is cleared by set-
ting *ESE0. Summary of *ESE messages is given in the following.
*ESE0 – No mask. Clears all bits in the register.
*ESE1 – ESB on Operation Complete.
*ESE2 – ESB on Request Control.
*ESE4 – ESB on Query Error.
*ESE8 – ESB on Device Dependent Error.
*ESE16 – ESB on Execution Error.
*ESE32 – ESB on Command Error.
*ESE64 – ESB on User Request.
*ESE128 – ESB Power on.
In general, whenever the 3155 receives an invalid SCPI command,
it automatically generates an error. Errors are stored in a special er-
ror queue and may be retrieved from this buffer one at a time. Er-
rors are retrieved in first-in-first-out (FIFO) order. The first error re-
turned is the first error that was stored. When you have read all er-
rors from the queue, the generator responds with a 0,"No error"
message.
If more than 30 errors have occurred, the last error stored in the
queue is replaced with -350, "Queue Overflow". No additional errors
are stored until you remove errors from the queue. If no errors have
occurred when you read the error queue, the generator responds
with 0,"No error".
The error queue is cleared when power has been shut off or after a
*CLS command has been executed. The *RST command does not
clear the error queue. Use the following command to read the error
queue:
SYSTem:ERRor?
Errors have the following format (the error string may contain up to
Programming Reference 4-71
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