16-10
Quadrus Verifier User’s Manual
Ethernet Application
Video TCP Port
The
Video TCP Port
is transmit-only (output from the Verifier, read-only by the host), and
is used for “binary frame” data outputs as follows:
1. Response to
Image Send
command
<op,4>
.
2. Response to
Capture and Decode
and
Save
command
<op,5>
.
3. Response to
Symbol Information
command
<op,8>
.
4. Response to
Histogram
command
<op,14>
.
The primary purpose of this port is for access to a dedicated video stream, for
ESP
functions
in particular. Because the format of the “binary frame” data is quite different from the Verifier's
other command responses and outputs, sending this data on a dedicated, independent TCP
port facilitates easier
ESP
implementation. Also, end users who wish to implement their own
applications may find this useful since it has a consistent data type and provides access to a
port whose only traffic is that which the host application has initiated.
The Video TCP Port is read-only from the host's perspective. The Verifier does not receive
any data or commands on this port. The Verifier only processes commands from the primary
(Command) TCP port. Also, the Verifier only responds to the video port if the video port has
a connection to the host and a command is received that requires a “binary frame”
response. If the video port is unconnected, the Verifier will respond to the primary port.
This allows hosts the option to operate via a single port.
Image File Transfers
The Verifier's image files can be accessed with either “binary frame” commands
<op,4>
and
<op,5>
, or
TFTP
(
T
rivial
F
ile
T
ransfer
P
rotocol).
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 Verifier using an
<op,4>
or
<op,5>
command,
for quicker response, it is recommended that TFTP be used.
TFTP Server
A TFTP client can access the Verifier's image files (the Verifier is a TFTP server). Since
TFTP does not support a directory structure, the host application must know the Verifier's file
naming convention, or request an image list from the Verifier through the primary TCP/IP
port (or RS-232 port) with the
<op,9>
command.
Limitations
The largest data size per packet (TCP MSS/MTU) the Verifier 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.
An MTU of 550 may be somewhat limiting for some networks, but this should not prevent
successful operation.
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Страница 210: ...6 32 Quadrus Verifier User s Manual Setting Up the Verifier for EZ Trax ...
Страница 302: ...8 62 Quadrus Verifier User s Manual Configuring EZ Trax Output ...
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Страница 362: ...12 14 Quadrus Verifier User s Manual Request All Database Settings ...
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Страница 404: ...15 14 Quadrus Verifier User s Manual Ordered Output Filter ...
Страница 444: ...A 30 Quadrus Verifier User s Manual Glossary of Terms ...