Measurement Computing Serial488/4 - Manual (Page 45)

Section 3 Command Descriptions
3.6
Error Query E?
The Error Query is used to determine the present error condition of the
Serial488/4. After execution of the Error Query, the present error condition is cleared.
The error condition is also returned and cleared by the status Un command.
E?
Return and clear present error condition
Example1: Query the error status using dual primary addressing mode.
PRINT#1,"OUTPUT08;E?" request error status
PRINT#1,"ENTER08"
INPUT#2,A$
PRINT A$
display shows E0, No errors
Example2: Query the error status using secondary addressing mode.
PRINT#1,"OUTPUT0800;W5X"
send an illegal command to the Serial488/4
PRINT#1,"OUTPUT0800;E?"
request error status
PRINT#1,"ENTER0800"
INPUT#2,A$
PRINT A$
display shows E1, unrecognized command
PRINT#1,"OUTPUT0800;E?"
request error status again
PRINT#1,"ENTER0800"
INPUT#2,A$
PRINT A$
display shows E0, error condition has
been cleared after reading error status