Section of recorded data used to synchronise the data decoding electronics to the data stream. It occurs at the end of the data block.
a pattern of recorded data used to synchronize the data encoding electronics to the data stream ... it occurs at the end of the data block
A field of data that is sent after the data in a message. It is typically used to tag transactions from the bar code reader for rapid processing by the host, and it expands the data field (record) length. See also preamble.