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4
O p e r a t i o n
Messages in the Reading Mode
During operation, the CLV outputs various messages on the display of the host device or on the screen of an ASCII terminal.
Messages can be canceled by pressing any key on the keyboard. Table 4-1 explains the messages that may appear in the
Reading Mode.
Read Quality
Bar code data will be sent to the host computer according to evaluation criteria programmed by the user. The paragraphs below
explain the difference between what the CLV considers a “good read” and a “wrong read” (called a “no read” here).
Good Read
If all specified evaluation criteria (e.g. number of multiple reads, match code comparison, etc.) have been satisfied, a reading gate
is referred to as a “good read” and will be output in the format selected by the user.
No Read
If all of the selected evaluation criteria (e.g. multiple reads, match code, etc.) have not been satisfied, or if the scanner can not
detect any bar codes, a reading gate is considered unsuccessful (“wrong read”). In the event of a “no read,” the CLV can output a
user-definable error string message that can consist of either the (user-definable) separator only, the (user-definable) error string
only, both the separator and the error string, or nothing at all. If the scanner is able to read something but can not fulfill the mini-
mum number of multiple reads specified by the user, the CLV can output the message “ST=5” with either an error string or the
code the scanner was able to read. To program the output format of a no read situation, see Section III, “Output Format: Wrong
Read.”
