Reference Guide
AXC-VAI2
Voltage Output/Analog Input Card
Product Information
The AXC-VAI2 Voltage Input/Output Card provides 2 DC voltage outputs
and 2 DC voltage/potentiometer inputs. Typical applications include the
control of CCTV lenses (DC drive/pot), teleconferencing lenses (voltage ref-
erence), or small DC motors up to 60 mA current. It may be used whenever
a DC voltage ramp and/or an analog-to-digital conversion of DC voltage or
resistance is required. The AXC-VAI2 Card can be programmed to provide
a variable voltage ramp from -12 to +12 VDC in 256 discrete steps. Preset
positions or voltage levels can be stored for later recall and can be sent to
the 2 independent outputs as required. Overcurrent protection is provided
for each output. Input voltage levels of up to 28 VDC are accommodated.
Potentiometers are included for coarse and fine adjustment of range, level
centering, and input levels. The AMX AXC-EXT Extender Card is recom-
mended when on-site adjustment is desired.
Specifications
The table below lists the AXC-VAI2 specifications.
Connectors
The following table describes the AXC-VAI2 pinout connectors.
Channels
Levels
Programming
The AXC-VAI2 card uses the Axcess programming language. For more
information, refer to the
Axcess Programming Language
instruction man-
ual.
Use the following table to set ramp rates and presets.
Specifications
Indicators
CR1 indicates voltage at Output 1 is changing.
CR2 indicates voltage at Output 2 is changing.
Jumpers:
Power-Up
Selects either center of range or lowest level when system is
powered on.
Input Type
(Channels 1 and 2) Selects either voltage or potentiometer
sense modes.
Switches
Calibration switches and Coarse and Fine level pots simplify
output adjustment of DC range.
Pinout Connectors
Pinout
Description
1
GND
2
Output 1
3
GND
4
Output 2
5
GND
6
Input 1
7
Input 2
8
+5 V REF
Channels
Channel
Function
1
While channel is on, ramps voltage channel 1 up (increase).
2
While channel in on, ramps voltage channel 2 up.
5
While channel is on, ramps voltage channel 1 down (decrease).
6
While channel is on, ramps voltage channel 2 down.
9
While channel is on, turns on AUX channel 3 voltage; when turned
off, sets AUX channel 5 voltage to 0.
10
When channel is on, voltage level for channel 1 is set to 255
(100%); when turned off, voltage level is set back to center.
11
When channel is on, voltage level for channel 1 is set to 0; when
turned off, voltage level is set back to center.
12
When channel is on, voltage level for channel 2 is set to 255
(100%); when turned off, voltage level is set back to center.
Channels (Cont.)
13
When channel is on, voltage level for channel 2 is set to 0; when
turned off, voltage level is set back to center.
14
When channel is on, voltage level for channel 1 is set to 192 (75%);
when turned off, voltage level is set back to center.
15
When channel is on, voltage level for channel 1 is set to 64 (25%);
when turned off, voltage level is set back to center.
16
When channel is on, voltage level for channel 2 is set to 192 (75%);
when turned off, voltage level is set back to center.
17
When channel is on, voltage level for channel 2 is set to 64 (25%);
when turned off, voltage level is set back to center.
Levels
Level
Function
1
Voltage output channel 1 and joystick/slider control (0 - 255).
5
Voltage input channel 1 (0 - 255).
2
Voltage output channel 2 and joystick/slider control (0 - 255).
6
Voltage input channel 2 (0 - 255).
Send_Commands
PL
Ramps specified
channel from cur-
rent level.
Ramps from current level to a specified preset level or percent-
age at the current rate or optionally in a specified amount of
time.
Syntax:
’P<output channel 1-2>L<level 0-255 | 0-
100%> [T<time>]’
Variables:
time = 0 - 255 in tenth seconds
level = 0 is the lowest voltage and 255 (100%) is the highest
voltage
Examples:
’P2L50%’
Ramps channel 1 to 50% mid voltage level at the current ramp
rate.
’P2L255T30’
Ramps channel 2 to highest voltage level in 3 seconds.
PR
Sets the ramp
rate of the speci-
fied channel
where the time is
the time to ramp
the full range.
The full range being both down to up and up to down, or option-
ally just down to up or only up to down.
Syntax:
’P<output channel 1 - 2><time>[U|D]’
Variables:
time = 0 - 255 in tenth seconds
U = Down to up only
D = Up to down only
Examples:
’P1R50’
Sets ramp rate of channel 1 to 5 seconds full range from down
to up and up to down.
’P2R75U’
Sets ramp rate of channel 2 to 7.5 seconds full range from down
to up only.
’P2R50D’
Sets ramp rate of channel 2 to 5 seconds full range from up to
down only.
