AMX AXC-VAI2 Reference Manual

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.
Specifications
Indicators CR1 indicates voltage at Output 1 is changing.
CR2 indicates voltage at Output 2 is changing.
Jumpers:
Selects either center of range or lowest level when system is
Power-Up
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.
Connectors
The following table describes the AXC-VAI2 pinout connectors.
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
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.
AXC-VAI2
Voltage Output/Analog Input Card
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
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).
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.
Send_Commands
PL Ramps from current level to a specified preset level or percent-
age at the current rate or optionally in a specified amount of
Ramps specified
time.
channel from cur-
Syntax:
rent level.
'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 The full range being both down to up and up to down, or option-
ally just down to up or only up to down.
Sets the ramp
Syntax:
rate of the speci-
fied channel
'P<output channel 1 - 2><time>[U|D]'
where the time is
Variables:
the time to ramp
time = 0 - 255 in tenth seconds
the full range.
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.
Reference Guide