Eliminating Common SCPI Errors
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1. Eliminating Common SCPI Errors Roger Chaplin May 17 1993 There are thr SCPI errors which occur more often than any others 113 Undefined header 410 Query INTERRUPTED 420 Query UNTERMINATED This paper gives likely causes for these errors and ideas for avoiding them 113 Undefined header This error indicates that what you sent to the instrument did not contain a recognizable command name The most likely causes for this are Lis Missing space between the command and its parameter There must be one or more spaces blanks between the command and its parameter For example sens volt dc rangl00 wrong sens volt dc rang 100 right Zs Improper short or long form Check the manual or the Quick Reference Guide for the correct command name Bo Blanks spaces within the command name Blanks are not permitted within the command name For example syst err right syst err wrong 410 Query INTERRUPTED This error occurs when you have sent a valid query to the instrument then send it another command or query or a Group Execute Trigger GET before it has had a chance to send th ntire response messag including the line feed EOI terminator The most likely causes are T Sending a query to the instrument and then sending another command or query before reading the response to the first query For example the fol2. age When the Model 2001 detects an error in a program message unit it discards all further program message units until the end of the string For example in the following program message sens date sens func the first program message unit sens date will generat rror 113 Undefined header and the Model 2001 will discard the second program message unit sens func even though it is a valid query NOTE There are plans to modify the behavior of our SCPI instruments such that queries following an erroneous program message unit do not get discarded but commands do This feature will be listed in the release notes for existing products when new firmware contains this modification and in the User Manual for new products
3. lowing sequence of commands will cause an error 410 send syst err send opc because you must read the response to syst err before sending another command or query E 488 driver The driver must be 28 Incorrectly configured IE 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 S the reference manual for your T E 488 interface particular IE 420 Query UNTERMINATED This error occurs when you addess the instrument to talk and it has nothing to say The most likely causes are Ts Not sending a query You must send a valid query to the instrument before addressing it to talk This is true even of measuring instruments such as the Model 2001 You cannot get a reading from the 2001 until you send it a query 2 Sending an invalid query If you have sent a query and still get this error make sure that the instrument is processing the query without error For example sending an ill formed query which generates an error 113 Undefined header and then addressing the instrument to talk will generate an error 420 Query UNTERMINATED as well 3 Valid query following an invalid command This can occur when you send mutiple commands or queries program message units within one command string program mess
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