CMU Error Messages 
1100.4903.12 9.3  E-4 
Error code  Explanation 
-158 
String data not allowed 
The command contains a legal string data element which is not allowed at this point. 
-161 
Invalid block data 
The command contains illegal block data, e.g. no numeric data element is sent after the introductory #. 
-168 
Block data not allowed 
The command contains legal block data which are not allowed at this point. 
-171 
Invalid expression 
The expression data element was invalid; for example, unmatched parentheses or an illegal character. 
-178 
Expression data not allowed 
A legal expression data was encountered but was not allowed by the device at this point in parsing. 
-180 
Macro error 
An error occurred when defining a macro or executing a macro. 
 
 
 
Execution error 
The following errors cause bit 4 in the ESR register to be set. 
 
Error code  Explanation 
-200 
Execution error 
An execution error as defined in IEEE 488.2, has occurred. 
-203 
Command protected 
-211 
Trigger ignored 
A triggering signal was received and recognized by the device but was ignored because of timing 
considerations. 
-212 
Arm ignored 
An arming signal was received and recognized by the device but was ignored. 
-213 
Init ignored 
A request for a measurement initiation was ignored as another measurement was already in progress. 
-221 
Settings conflict 
A setting contradicts another setting. The last attempted setting was not executed. 
-222 
Data out of range 
A value of the transmitted command was outside the legal range. 
-223 
Too much data 
More data were sent by the host than the CMU can handle.