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B-8 Status and Error Messages Models 2500 and 2502 User’s Manual

Eliminating common SCPI errors

There are three SCPI errors that occur more often than any others:

• -113, Undeﬁned header

• -410, Query INTERRUPTED

• -420, Query UNTERMINATED

The following paragraphs discuss the causes for these errors and methods for avoiding

them.

-113, Undeﬁned header

This error indicates that the command you sent to the instrument did not contain a recog-

nizable command name. The most likely causes for this error are:

• Missing space between the command and its parameter — There must be one or more

spaces (blanks) between the command and its parameter. For example:

:SENS1:CURR:RANG2e3 Incorrect (no space between command and parameter)

:SENS1:CURR:RANG 2e3 Correct

• Improper short or long form — Check the command list in Section 17 for the correct

command name.

• Blanks (spaces) within the command name — For example:

:SYST :ERR? Incorrect (space between :SYST and :ERR?)

:SYST:ERR? Correct

- 410, Query INTERRUPTED

This error occurs when you have sent a valid query to the instrument, and then send it to

another command or query, or a Group Execute Trigger (GET) before it has had a chance

to send the entire response message (including the line-feed/EOI terminator). The most

likely causes are:

• Sending a query to the instrument and then sending another command or query before

reading the response to the ﬁrst query — For example, the following sequence of com-

mands will cause an error -410:

:SYST:ERR?

*OPC?

This sequence generates an error because you must read the response to :SYST:ERR?

before sending the *OPC? query.

• Incorrectly conﬁgured IEEE-488 driver — The driver must be conﬁgured so that when

talking on the bus it sends line-feed with EOI as the terminator, and when listening on

the bus it expects line-feed with EOI as the terminator. See the reference manual for

your particular IEEE-488 interface.

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Keithley 2500 User Manual

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