Chapter 3 Barcode Transfer
Introduction
The transfer of barcode data from the EA3600 to the controller is performed using the same mechanism for all
Industrial Ethernet protocols.
This chapter provides the details of how this transfer is accomplished, independent of the protocol being used.
Transfer Modes
The EA3600 provides three modes of barcode transfer mechanisms. The three modes provide increasing level of
data integrity and data size capabilities.
Basic Mode
When using Basic Mode transfer, the barcode data is sent to the controller as it is received. There are no checks to
verify that the controller read or processed the data; new data overwrites previous data when it is received by the
EA3600 from the scanner. Basic Mode is the simplest transfer to implement as it does not require logic in the
controller to interact with the EA3600.
Handshake Mode
Handshake Mode adds a level of data integrity to the barcode transfer as the controller must acknowledge each
piece of barcode data. The EA3600 does not send new data until the controller indicates that it completed
processing the previous data. Barcode scanning is disabled while the controller is busy to guarantee that integrity
of the data being processed.
Fragmentation Mode
Some of the Industrial Ethernet protocols have limited message buffer sizes. Fragmentation Mode allows barcode
data that is larger than the protocol message buffer to be transferred to the controller. When using Fragmentation
Mode if a barcode is larger than the message buffer it is broken up and sent to the controller in multiple blocks and
the controller re-assembles the blocks to create the complete barcode.
Fragmentation Mode requires the use of Handshake Mode to guarantee that each fragment block is received by
the controller.
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General