Day/Night Functionality
AW00101510000
98
Basler IP Fixed Dome Cameras
Controlling an External Device Based on the IR-Cut Filter Position
As mentioned, the camera includes a capability called the IR-cut filter announce feature. When this
feature is enabled, the camera will "announce" the current position of the IR-cut filter by setting the
state of an I/O port that has been set to act as an output with a function of "IR Filter Announce".
For example, if you set the Direction parameter for I/O-1 to "Output" and the Function parameter for
I/O-1 to "IR Filter Announce", the port would act as an output and the state of the port will
"announce" the position of the IR-cut filter. When the IR-cut filter is in the night position, the port will
be set to active. When the IR-cut filter is in the day position, the port will be set to inactive. (See
Section 3.9.1 on
page 59
for more information about setting the digital I/O port parameters.)
A common way to use this capability is to set the IR-cut Filter Mode parameter to "Auto" mode and
to use an I/O port to switch an IR illuminator on and off. Figure 17 shows a simple way that this can
be done. In Figure 17, the IR-cut Filter mode is set to "Auto", the Direction parameter for I/O-1 is set
to "Output", and the Function parameter for I/O-1 is set to "IR Filter Announce". In the figure, the
port is used to energize or de-energize a relay, which in turn applies power to or removes power
from an IR illuminator. You could use a setup such as this to apply power to the illuminator when
the filter is in the night position at night and to remove power from the illuminator when the filter is
in the day position during the day.
NOTICE
The text in this section and in the illustration shown in Figure 17 are intended as a general
description of how you can use an I/O port on the camera to control an external device. Any device
or circuit that you attach to an I/O port on the camera must adhere to the specifications provided
in Table 3 on
page 85
.
Using an I/O port in a way that does not meet specifications can severely damage the
camera.
