IMAQ OCR Session specifies the OCR session on which this VI operates. To create a session, use the IMAQ OCR Create Session VI.

Valid Characters is the array of characters that are valid for a particular read character position. The valid characters are stored at the array index that corresponds with the index of the read character that OCR is currently evaluating. For example, if OCR is evaluating the read character at index 0, it compares that read character to the valid characters that are stored at index 0 in the array of valid characters. The number of elements in the array is the number of characters that OCR reads. OCR ignores any array elements beyond this number.

Pre-defined characters defines predefined valid character strings. The following characters are the pre-defined characters for the corresponding position: Any Character (0) Any ASCII character User-defined Characters  (1) Uses characters you specify in the User-defined characters string. Alphabets (2) A-Z a-z Alphanumeric (3) A-Z a-z 0-9 Uppercase Letters (4) A-Z Lowercase Letters (5) a-z Decimal Digits (6) 0-9 Hexadecimal Digits (7) 0-9 A-F Pattern (8) Any Pattern Force Space (9) Ignores the read character and forces a space at the corresponding position

User-defined characters is the string of characters that is valid for the corresponding character position when Pre-defined characters is set to User-defined Characters.

error in (no error) describes the error status before this VI or function runs. The default is no error. If an error occurred before this VI or function runs, the VI or function passes the error in value to error out. This VI or function runs normally only if no error occurred before this VI or function runs. If an error occurs while this VI or function runs, it runs normally and sets its own error status in error out. Use the Simple Error Handler or General Error Handler VIs to display the description of the error code. Use error in and error out to check errors and to specify execution order by wiring error out from one node to error in of the next node.

	status is TRUE (X) if an error occurred before this VI or function ran or FALSE (checkmark) to indicate a warning or that no error occurred before this VI or function ran. The default is FALSE.
	code is the error or warning code. If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code.
	source describes the origin of the error or warning and is, in most cases, the name of the VI or function that produced the error or warning. The default is an empty string.

IMAQ OCR Session (dup) is the reference to the OCR session to which this VI operates.

error out contains error information. If error in indicates that an error occurred before this VI or function ran, error out contains the same error information. Otherwise, it describes the error status that this VI or function produces. Right-click the error out indicator on the front panel and select Explain Error from the shortcut menu for more information about the error.

	status is TRUE (X) if an error occurred or FALSE (checkmark) to indicate a warning or that no error occurred.
	code is the error or warning code. If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code.
	source describes the origin of the error or warning and is, in most cases, the name of the VI or function that produced the error or warning. The default is an empty string.