Astronics OmniBusII, Руководство пользователя, Страница: 41 / 58

MODULE CONFIGURATIONS
configval
Constant Description
PARAMCFG708_DEFAULT
Select all default settings ( bold below)
PARAMCFG708_AMPLON Enables parametric amplitude control
PARAMCFG708_AMPLHI
Enables parametric amplitude control high range
PARAMCFG708_AMPLLO Enables parametric amplitude control low range
PARAMCFG708_AMPLOFF Disables parametric amplitude control
Table 6.11—ARINC 708 ParamAmplitudeConfig Configval
Since the actual amplitude and linearity depend on both the line driver and load,
the user must calibrate with the conditions in use for the degree of accuracy
desired. Some line drivers are not capable of putting out very low voltages; be
sure to verify the output under your operating conditions.
6.6 ARINC 717 Modules
The preferred ARINC 717 I/O modules for OmniBus II are listed in the table
below.
Part No. 717 Channels 717 Parametrics
451 4R/4T Amplitude
455* 4R/4T Amplitude
R = receive and T = transmit.
* Also includes ARINC 429 channels.
Table 6.12—ARINC 717 Module New Applications Part Numbering
Both the 451 and 455 modules have four receivers and four transmitters. Module
455 also includes ARINC 429 channels (as described in Section 6.4). All Omni-
Bus ARINC 717 channels are capable of operating at 64, 128, 256, 512, 1024,
2048, 4096, and 8192 wps and may be software-configured as biphase or bipolar.
All transmit channels have variable amplitude capability.
Though the above ARINC 717 modules are preferred and recommended for new
applications, Ballard does offer OmniBus II modules in the table below in con-
figurations and functionality corresponding to those in the original OmniBus
family.
Part No. 717 Channels 717 Parametrics
431 4R/4T Amplitude
435* 4R/4T Amplitude
R = receive and T = transmit.
* Also includes ARINC 429 channels.
Table 6.13—ARINC 717 Module Deprecated Part Numbering
6.6.1 Variable Transmit Amplitude
To use variable transmit amplitude (available for all 717 channels), the user
specifies the channel and a relative 12-bit amplitude. The full-scale value of
FF0h is the default setting. The 12-bit amplitude has a resolution of 8 bits, so the
least significant 4 bits are “don’t cares.” Since the actual amplitude and linearity
depend on both the line driver and load, the user must calibrate with the condi-
tions in use for the degree of accuracy desired. Some line drivers are not capable
of putting out very low voltages; be sure to verify the output under your operat-
ing conditions.
OmniBus II PCIe/PXIe User’s Manual 6-7