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NXC-VAI4 Analog Voltage Control Card
27 NetLinx Cardframe, Control Cards, and NetModules
NXC-VAI4 Analog Voltage Control Card
The NXC-VAI4 Analog Voltage Control Card ( FG2025 ) provides four independent analog-to-digital inputs
and four independent digital-to-analog outputs, which are controllable over the ICSP network.
Each port can be configured for a variety of DC input and output signals.
The NXC-VAI4 incorporates the functionality of the AXC-VAI2 and AXC-VRG AXlink cards. FIG. 7 shows
the VAI4 card:
Specifications
FIG. 7 NXC-VAI4 Analog Voltage Control card
NXC-VAI4 Specifications
Power Requirements 330 mA @ 12 VDC
Inputs Four high-impedance analog DC inputs.
Outputs Four analog DC outputs (user-configurable).
D/A, A/D conversion A/D and D/A converters for analog sampling and control. 8 or 10-bit; user-
selectable via the ADMODE SEND_COMMAND (see the
Programming
Information section on page 31 for details)
Available input voltages 0 V to +12 V
Available output voltages:
-12 V to +12 V The output voltage may be software-configured for any min. and max. levels
between -12 and +12 VDC.
• Maximum output current = 60 mA per output.
• Over-voltage protection to +28 VDC.
External reference A user supplied external reference voltage can be used to set the maximum
voltage range for the D/A outputs. The full analog output range is scaled to fit
the maximum range set by the external reference.
Output voltage may be set to any level between 0-12 VDC, referenced to the
external reference voltage input and NXC-VAI4 power supply GND.
External reference input:
(EREF - one for each output) • Maximum external reference input voltage = +12 VDC.
• Over-voltage protection to +28 VDC.
Internal reference output:
(IREF) • +5 V reference output, maximum current = 60 mA.
• This output is intended to drive a ground-referenced load.