Crestron cnxfz User Manual

Crestron CNXFZ 

Focus/Zoom Control Interface

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 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%.  

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 (

. New users are required to 

register in order to obtain access to the FTP site.  

•  11