ANPR
© Nedap AVI, P.O. Box 103, NL-7140 AC GROENLO Page 10 of 27
5.2 NUMBER PLATE READER CONFIGURATION
5.2.1 GENERAL
The ANPR system can operate in three different modes:
• FREE RUN mode
• TRIGGER by digital input mode (see chapter 5.2.4 about how to setup the digital input to trigger the ANPR).
• TRIGGER by ethernet mode (see the ANPR ethernet programmers guide about how to trigger the ANPR by
ethernet).
When in FREE RUN mode, the ANPR freely grabs and processes images. The software automatically detects the
presence of a number plate in the image and thus generates events.
When in TRIGGER-START-STOP mode, the ANPR grabs and processes the images in the time period between the
start trigger and the stop trigger. In case the stop trigger is not being activated within the GateTimeMax interval,
the system automatically generates the stop trigger after the interval expires. Any stop trigger received prior to a
start trigger will be ignored. Any start trigger received after a start trigger immediately generates an event and
restarts the image processing.
When in TRIGGER-START-TIME mode, the unit starts image grabbing when the start trigger is activated and stops
image grabbing after a time interval that was previously defined in the GateTimeMax setting (see chapter 5.2.4).
Once GateTimeMax has expired, an event is generated. If the system receives a start trigger during GateTime
period, it immediately generates an event and restarts the image processing.
When in TRIGGER-START-FREE-RUN-STOP mode, the unit starts image grabbing when the start trigger is
activated and then starts grabbing and reading number plates in FREE RUN mode. The system may generate
multiple events during the interval between start trigger and stop trigger.
When in TRIGGER by ethernet mode the image grabbing and processing is started upon receiving the start
TRIGGER message from the Ethernet network. The start trigger message contains a precise time in milliseconds
that expresses the GateTime during which the ANPR will grab images. When GateTime expires or upon receiving
a stop trigger message, the machine stops image grabbing. The trigger message also contains a generic string
the system uses to generate trigger messages where info may be inserted. Such string will later made available
on the web interface using the %NET_TRIG_ID tag. This makes it possible to associate to any event data, images
and other info about the specific trigger message from which they were originated.
The system may generate the following events upon a processed image:
• OCR READ
• OCR NOT READ
• OCR NO PLATE (not in FREE RUN mode)
The General Settings page contains the following configuration fields:
Enable Engine: It allows enabling/disabling the processing of the images grabbed by ANPR. The
parameter takes two possible values: YES or NO. If set to NO, the device is switched to
stand-by mode and its infrared illuminator is disabled. It will ignore any external
trigger. The infrared illuminator is only momentarily enabled if the Camera OCR page
is being accessed.
Acquisition mode: It allows selecting the system operating mode. Select FREE-RUN, TRIGGER-START-
STOP, TRIGGER-START-TIME, TRIGGER-START-FREE-RUN-STOP or TRIGGER-ETHERNET.
Site Address: This field can contain an alphanumeric string, such as the address of a system
location. This string is available as %SITE_ADDRESS TAG and can be sued in the text
value field of the Save Image action.
TCP message after ftp actions: With this parameter you can enable sending a TCP message after ftp actions
(ftp save image and ftp save DB).
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