CNX Analog Output Expansion Card
Crestron
CNXAO-8
screwdriver, and a procedural program is required. Crestron provides the program
(CNXAO8SU.ZIP) from the Software Downloads page (Examples Library) of our
website (
. This zipped file contains the VisionTools™ Pro (VT
Pro) touchpanel files and a SIMPL™ Windows
file (.SMW). These files provide a
simple adjustment program designed to be used to perform the procedures described
in subsequent parapgraphs.
All outputs (A1 through A4 and B1 through B4) are factory set with a 10 volt span of
0 to +10 VDC. If it is necessary to adjust this preset voltage span, be sure that the
CNXAO-8 is installed into the control system and that the VT Pro and SIMPL
Windows procedural programs are running. The first portion of this adjustment
procedure is to set the lower limit (offset). The second portion of the procedure is to
set the upper limit (span). Ths final portion of the procedure is to fine tune the
voltage span.
The first two subsections that follow this paragraph provide the steps necessary to
complete an output voltage limit adjustment. The third subsection is only required if
one desires to minimize the tolerance of the voltage span. As an example, this
procedure sets an output with a 10 volt span that centers around 0 volts (ie., +/-5
VDC).
NOTE:
Turn the SPAN and OFFSET pots clockwise (CW) to increase voltage.
Turn pots counter clockwise (CCW) to decrease voltage.
Lower Limit Adjustment
If the need exists, it is possible to
set a different offset voltage for
each output in a group.
This lower limit adjustment procedure sets the low-end voltage value. In general, the
lower limit cannot be less than –12 VDC. This adjustment must be set for each
output utilized in the group.
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 lowest level (0%).
3. Use a screwdriver to adjust the OFFSET A1 pot so that the voltmeter
reads –5 VDC.
4. Repeat “Lower Limit Adjustment” steps 1 through 3 for the remaining
group A outputs (A2, A3, and A4).
Upper Limit Adjustment
This upper limit adjustment procedure sets the high-end voltage value. In general,
the upper limit cannot be more than +12 VDC. This adjustment only needs to be set
for one utilized output in the group.
1. Connect a voltmeter between any group A output (A1 through A4) and
group A ground. For this example, use A1 and ground.
2. Use the VT Pro program to set the A1 output to its highest level
(100%).
3. Use a screwdriver to adjust the SPAN A pot so that the voltmeter reads
+5 VDC.
4. Repeat “Lower Limit Adjustment” steps 1 through 4 and “Upper Limit
Adjustment” steps 1 through 3 to set the adjustment for the group B
outputs. These steps only need to be completed once for each group per
application. Once completed, proceed to the fine tuning portion of the
procedure.
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CNX Analog Output Expansion Card: CNXAO-8
Operations Guide - DOC. 8142
