Astronics OMNIBUS II NI PXIe, User Manual

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MODULE CONFIGURATIONS
OmniBus II NI PXIe User Manual 6-5
Parameter Min Max Resolution Comment
Waveform High* -20 V +20 V 10 mV
10 V (nominal)
Range = 0 to 200%
Waveform Null** -20 V +20 V 10 mV 0 V (nominal)
Waveform Low* -20 V +20 V 10 mV
-10 V (nominal)
Range = 0 to 200%
Common-mode
Bias
+
-10 V +10 V 5 mV 0 V (nominal)
Rise/Fall Time
(High speed)
1 µs 4 µs 100 ns Slew rate limit: 40 V/µs
Rise/Fall Time
(Low speed)
1 µs 39 µs 100 ns Slew rate limit: 40 V/µs
* Differential. ** Differential and must be between the waveform high and low.
+
The common-mode bias is available on revision D or higher parametric 429 modules. The
common-mode bias voltage cannot be set in a way that causes either side of signal to be
outside the -10 V to +10 V range.
Table 6.7—ARINC 429 Parametric Waveform Characteristics
6.3.2 Configurable Frequency
You can operate parametric ARINC 429 modules at non-standard speeds. This
configurable frequency can be set in software for each transmit and receive chan-
nel. Thus, 429 channels may be used with equipment that varies from the ARINC
429 standard (such as some implementations of ARINC 575).
Use a bit-rate configuration function to get a non-standard frequency. Contact
Customer Support (see Section 1.5) for the appropriate parameters for your module
part number and desired frequency.
6.3.3 Output State
ARINC 429 modules with output state functionality have the capability under
software control to:
•
Open either output leg of a transmit channel
•
Short either output leg of a transmit channel to ground