3 - 4 EA3600 Network Connect Product Reference Guide
The chart does not show every I/O message, but shows the changes in the I/O message content. Depending on
the I/O connection cyclic interval, a given message content may be repeated multiple times between the EA3600
and controller.
Figure 3-1 Handshake Mode Mechanism When Transferring Two Barcodes
Fragmentation Mode
Transfer Control
Fragmentation Mode uses the Handshake Mode mechanism for data transfer control and adds the ability to handle
barcode data that is larger than the Input Data field. See Handshake Mode on page 3-3 for complete details on
transfer control.
Barcode Data Fragmentation Control
When Fragmentation Mode is enabled, barcode data that is larger than the Input Data field is broken up and sent in
multiple blocks to the controller.
If the barcode data fits entirely in the Input Data field, the Barcode Fragmented bit in the Status register is cleared
and the transfer mechanism described in Handshake Mode is used.
If the barcode is larger than the Input Data field, the following transfer mechanism is used.
•
First block
• Barcode Fragmented and First Fragment bits in the Status Register are set.
• Input Length is set to the overall size of the Input Data byte array and it contains the first fragment of the
barcode.
•
Blocks 2 through (n-1)
• Barcode Fragmented and Middle Fragment bits in the Status Register are set.
• Input Length is set to the overall size of the Input Data byte array and it contains the next fragment of the
barcode.
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General