Crestron
CNXAO-8
CNX Analog Output Expansion Card
Fine Tune the Voltage Span
Only one utilized output per group needs to be fine tuned to guarantee minimal
tolerance of the voltage span and offset for the CNXAO-8. The procedure below
defines the steps necessary to fine tune one output at a time. For this example, the
procedure fine tunes output A1.
1. Connect a voltmeter between the A1 output and group A ground.
2. Use the VT Pro program to set the A1 output to its midpoint level
(50%).
3. Use a screwdriver to adjust the OFFSET A1 pot so that the voltmeter
reads 0 VDC.
4. Use the VT Pro program to set the A1 output to its highest level
(100%).
5. Use the screwdriver to adjust the SPAN A1 pot so that the voltmeter
reads +5 VDC.
6. Repeat “Fine Tune the Voltage Span” steps 4 and 5 until tolerance is
satisfactorily minimized.
7. Repeat “Fine Tune the Voltage Span” steps 1 through 6 for the
remaining group.
Programming with SIMPL™ Windows
SIMPL (Symbol Intensive Master Programming Language) is an easy-to-use
programming language that is completely integrated and compatible with all
Crestron system hardware. The objects that are used in SIMPL are called symbols.
SIMPL Windows offers drag and drop functionality in a familiar Windows®
environment.
SIMPL Windows is Crestron Electronics' software for programming Crestron control
systems. It provides a well-designed graphical environment with a number of
workspaces (i.e., windows) in which a programmer can select, configure, program,
test, and monitor a Crestron control system.
The next two subsections describe a sample SIMPL Windows program that utilizes
the CNXAO-8. The first subsection details how the sample program works with a
textual description and block diagram. The second subsection provides a broad
description of how to actually create the SIMPL Windows program.
NOTE:
The following description assumes that the reader has knowledge of SIMPL
Windows. If not, please refer to the extensive help information provided with the
software.
NOTE:
There is no need to recreate the sample SIMPL Windows program. A
similar copy of this program is available from Crestron’s ControlCD (version 5.2 and
later) or the Software Downloads page (Examples Library) of the Crestron website
(www.crestron.com). Search for the CNXAO8EX.ZIP file. This zipped file contains
the SIMPL Windows file (.SMW) as well as the VT Pro touchpanel files.
How the Program Works
The example SIMPL program is shown below in block diagram form and illustrates
three possible applications of the CNXAO-8. To recreate this example refer to
“Output Voltage Limit Adjustment” on page 3 and follow the procedure to setup port
Operations Guide - DOC. 8142
CNX Analog Output Expansion Card: CNXAO-8
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