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Crestron CNXFZ Focus/Zoom Control Interface
Positional Feedback Signals
Positional feedback signals are generated by the networked CNXFZ and input to the
rest of the program. Two analog positional feedback signals, FOC_POS and
ZOOM_POS, represent the current focus/zoom lens setting. The CNXFZ converts
positional potentiometer wiper voltages to analog positional feedback signals. In
general for example, an analog level of 0% on ZOOM_POS indicates that the lens is
at its wide shot (wide and tight shot descriptions may be reversed for some camera
lens, consult the manufacturer). An analog level of 100% on ZOOM_POS indicates
that the lens is at its tight shot.
Drive Signals
Drive signals are generated from the SIMPL Windows program and output to the
CNXFZ. There are two types of drive signals, position and rate. Each type is
comprised of analog programmed outputs for the CNXFZ.
Two position drive signals, FOC_SET and ZOOM_SET, are used to instruct the
CNXFZ to drive the camera to a preset position. Anytime the analog level on one of
these drive signals change, the CNXFZ adjusts the corresponding focus/zoom lens
position until the feedback matches the level at the programmed output.
Three rate drive signals, IRIS_RATE, FOC_RATE, and ZOOM_RATE, are used to
drive the focus/zoom lens position without the use of presets. For the focus/zoom
lens position to remain motionless, the analog level at each of these programmed
outputs should be 50%. If one of these levels rises higher than 50%, the
corresponding iris or focus/zoom lens position is adjusted in the positive direction
until the level returns to 50%. If the level drops below 50%, the corresponding iris or
focus/zoom lens position is adjusted in the negative direction until the level returns
to 50%.
How to Create the Program
Configuration Manager
Use the Configuration Manager workspace (Project | Configure System) in SIMPL
Windows to select and configure all the devices that need to be included into the
system. For this example, from the Control Systems folder in the Device Library
select CNMSX-PRO. Add a CT-3000 from the Touchpanels (Wired) folder; the
touchpanel NET ID must be set to 03, shown on the next page. Drag and drop the
CT-3000 onto Net Device (Slot #9 on the CNMSX-PRO).
NOTE: SIMPL Windows v1.30.01 or later is required to program the control
system containing a CNXFZ. If using an earlier version of SIMPL Windows,
Crestron recommends a SIMPL Windows and operating system upgrade. The latest
versions can be obtained from the Software Downloads page (Simplwin and OPSYS
Libraries) of the Crestron website (www.crestron.com). New users are required to
register in order to obtain access to the FTP site.
Operations Guide - DOC. 5753 CNX Focus/Zoom Control Interface: CNXFZ • 11