Users Manual

ALL
EFFECTIVITY
© Honeywell International Inc. Do not copy without express permission of Honeywell.
Page 5-50
22 Apr 2019
23-15-49
SYSTEM DESCRIPTION, INSTALLATION, AND MAINTENANCE MANUAL
ASPIRE-400
(5) If the "Data from CMU 2" interface is not enabled by ORT, the ACD interacts with CMU1
as a single active CMU.
(6) The ACD sets the same ORT defined speed for all the following busses:
(a) The "Data to CMU 1 & 2" transmit interface;
(b) The "Data from CMU 1" receive interface; and
(c) The ORT enabled "Data from CMU 2" receive interface.
K. SDU to CMU - Transmit Labels
(1) The ACD transmits the SDU Subsystem Identifier Word ARINC 429 Label 172 on the
"Data to CMU 1 & 2" interface at a period of 1 second ±100 ms with the bit fields as
follows:
Table 5-14. Label 172: SDU Subsystem Identifier Word
Bit Range Field Name (Discrete Format) Valid Values/Ranges
1-8 Label 172o
9-16
SDU SAL 307o – SDU #1
173o SDU #2
17
Classic Aero (Satellite System Type)
0
18 18 0 – Not capable
1 – Capable (When ATN Test Feature enabled)
19 Iridium 0
20-29
Spare
0
30-31 SSM (Note bits 30-31) 00 – Normal Operation
10 Functional Test
32 Parity
Odd
NOTE: When the ATN test feature is enabled, bit 18 will be set.
(2) The ACD transmits the SDU to ACARS MU/CMU Status Word ARINC 429 Label 270 on
the "Data to CMU 1 & 2" interface at a period of 1 second ±100 ms with the bit fields as
follows:
Table 5-15. Label 270: SDU to "ACARS" MU/CMU Status Word
Bit Range Field Name (Discrete Format) Valid Values/Ranges
1-8 Label 270o
9-10 SDI
01b if strapped to SDU1
10b if strapped to SDU2
11 Data Link to MU/CMU Not Available
1 = Not Available
0 = Available – De-asserted by Mater only for dual
12 Mu/CMU #1 Inactive
1 = Inactive – No Label 270 Activity from CMU #1
DRAFT
3rd rvw Draft as of:
29 January, 2020