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3 - 76 USING THE COMBISCOPE INSTRUMENTS
3.15.4 How to report errors
Instrument errors usually caused by programming or setting errors, can be
reported by the instrument during the execution of each command. To make sure
that a program is running properly, you should query the instrument for possible
errors after every functional command. This is done by sending the
SYSTem:ERRor? query or the STATus:QUEue? query to the instrument, followed
by reading the response message. However, through this practice the same "error
reporting" statements must be repeated after sending each SCPI command. This
is not always practical. Therefore, one of the following approaches is advised:
1) Send the SYSTem:ERRor? or STATus:QUEue? query and read the instru-
ment response message after every group of commands that functionally
belong to each other.
2) Program an error-reporting routine and call this routine after each command
or group of commands. For an example of an error-reporting routine, refer to
section 3.16.4.1.
3) Program an error-reporting routine and use the "Service Request (SRQ)
Generation" mechanism to interrupt the execution of the program and to
execute the error-reporting routine. Therefore, refer to section 3.16.4.2.
3.15.4.1 Error-reporting routine
Send the SYSTem:ERRor? or STATus:QUEue? query and read the instrument
response after every group of commands that functionally belong to each other,
by calling an error-reporting routine after each group of commands.
PROGRAM EXAMPLE:
DIM response AS STRING
*
30
CALL Send (0, 8, "CONFigure:AC (@1)", 1) ’
Configures for AC-RMS
FOR i = 1 TO 20 ’
Performs 20 measurements
CALL Send (0, 8, "READ:AC?", 1)
CALL Receive (0, 8, response$, 256) ’
Reads the AC-RMS value
PRINT "AC-RMS: "; response$ ’
Prints the AC-RMS value
GOSUB ErrorCheck ’
Checks for instrument errors
NEXT i
’
*****
’
*****
REST OF THE APPLICATION
’
*****
END
ErrorCheck:
CALL Send (0, 8, "SYSTem:ERRor?", 1) ’
Queries for a system error
CALL Receive (0, 8, response$, 256) ’
Reads the instrument error
PRINT "Error: "; response$ ’
Prints the instrument error
RETURN