The system-defined error codes are chosen on an enumerated (“1 of N”) basis. The SCPI-defined error codes and the <error description> portions of the query response are listed here. The first error described in each class (for example –100, –200, –300, –400) is a “generic” error. In selecting the proper error code to report, more specific error codes are preferred, and the generic error is used if the others are inappropriate.