Microscan Quadrus EZ, User Manual, Page: 304 / 366

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Quadrus EZ Reader User’s Manual
Image File Transfers
The reader's image files can be accessed with either “binary frame” commands <op,4>
and <op,5> , or TFTP.
Binary Frames
These are primarily intended for ESP's “near-real-time video” purposes. Although it is possible
to get a full-size image from the reader using an
<op,4> or <op,5> command, for quicker
response, it is recommended that TFTP be used.
TFTP Server
A TFTP (Trivial File Transfer Protocol) client can access the reader's image files (the
reader is a TFTP server). Since TFTP does not support any sort of directory structure, the
host application must know the reader's file naming convention, or request an image list
from the reader through the primary TCPIP port (or RS-232 port) with the
<op,9> command.
Limitations
The largest data size per packet (TCP MSS/MTU) the reader can receive and transmit is
approximately 550 bytes. Since TCP/IP is used, this will not prevent larger data transmissions,
but it will limit throughput.
Some host network systems may find an MTU of 550 somewhat limiting, but this should
not prevent operation with any network.