INSTALLATION MANUAL
CMA-5024 GLSSU
This document includes Proprietary Information and shall not be reproduced or communicated to third party
without prior written permission by CMC Electronics Inc.
Page A.15
November 21, 2008
1.2.9 ARINC 429 OUTPUTS
1.2.9.1 ARINC 429 data outputs configuration
The GLSSU provides ten ARINC 429 data output busses as follows:
- Three independently buffered GPS ARINC 429 outputs, driven at either the high (100 kHz bit rate)
or low speed (12.5 kHz bit rate) based upon the 429 HS/LS Select input discrete. Except that in the
Data Load mode the ARINC 429 output bus will be high speed regardless of the discrete input. The
GPS output data format is as per Table A-12.
Note: The GPS busses are intended for providing backward-compatibility with legacy
installations based on ARINC 743A-4 GPS receivers and the navigation data output rate
remains at 1 Hz (once per second).
- Three independently buffered GLS ARINC 429 outputs, driven at A429 high speed (100 kHz bit rate
only). The three busses output identical data streams. The GLS output data format is as per Table
A-13.
Note: The GLS busses provide extra capability and are available only on the approach aircraft
connector J3. The navigation data output rate is increased to 10 Hz and a super-set of
data labels supports the SBAS Approach functions, based-on but not fully compliant with
ARINC 743A-4 and ARINC 755-3 characteristics (at time of writing). The new or
modified labels are detailed in Appendix C.
Note: The GLS busses on J3 can be configured by APD to be GPS busses. However given the
presence of three such busses on J1, it is not expected that such an APD Configuration
will be provided.
Note: When enabled by the Synchronized Approach Selection APD and under other conditions,
the GLSSU will re-broadcast on its GLS outputs certain data labels received on its
Controller Unit and X-Talk input busses. This includes re-broadcasting the data labels 45
& 46 (Message Block Start & Message data Body) and 227 (Command Summary Word).
Refer to Appendix E.
- Two independently buffered ILS Look-Alike ARINC 429 outputs, driven at low speed (12.5 kHz bit
rate). They are available only on the approach aircraft connector J3. The ILS Look-Alike output data
format is as per Table A-14 when the HIS selects the GLS source; otherwise the ILS input data is
passed through.
Note: The APD defines the ARINC 429 labels to be used for outputting the following ILS data:
ILS Frequency, Selected Runway H and Ground Station Identifier. Refer to Appendix E.
- Two independently buffered DME Look-Alike ARINC 429 output, driven at low speed (12.5 kHz bit
rate). They are available only on the approach aircraft connector J3. The DME Look-Alike output
data format is as per Table A-15 when the HIS selects the GLS source; otherwise the ILS input data
is passed through.
Note: The APD defines the ARINC 429 labels to be used for outputting the following DME data:
DME Frequency, Distance to LTP/FTP, LTP/FTP Range rate, LTP/FTP Time-To-Go and
Ground Station Identifier. Refer to Appendix E. The DME Frequency is also output using
the label 35.
The document reference is online, please check the correspondence between the online documentation and the printed version.
To Next Page
Loading...
Need help?
General
