Metrologic Optimus S Programming Manual page 216

210 "C" Programming Guide For Optimus S/R
An error code is set to the global variable fErrorCode to indicate the error
condition encountered. Below are possible error codes and their interpretation.
Error Code
2
4
7
8
13
14
16
See Also has_member
Interpretation
File specified by DBF_fd does not exist.
File specified by DBF_fd is not a DBF file.
Invalid file handle.
File not opened.
Invalid value in argument: key_number
IDX file specified by key_number does not exist.
No members exist in the DBF file.