1. Introduction
The MIL 1553 standard was published in 1973 to provide the functional characteristics of a serial bus. It was first used by F-16 Falcon followed by a number of other military aircraft. It is a half duplex system with redundant cables.
To understand how the system work, we need to understand some of the terms:
- Avionic bus – communication between diff parts of ac
- Source – remote terminal with data to transmit
- Sink – a remote terminal to receive the date
- Dual redundancy - use
of back up system even part of comm. Fail, data will be sent and received.
2. Development on the EARLY aircraft.
-
Analogue
-
One device one display
-
No crss communication.
-
Example, altimeter, speedometer and compass are
individual gauge.
Second generation
-
One devices many users.
o
Altimeter – display/ autopilot/ flight recorder.
o
Engine parameters – display/ autopilot/ flight
data recorder/maintenance log.
-
1980 ARINC 429, direct wire connection. As long the number
is small, the system work well.
3. About MIL 1553
- Communication between 32 boxes.
- Data 32 16 bits words
- Command control , commander speak one at a time, all tramits
begins with command word.
- Messages:
- 0 BC to all RT
- 0 Broadcast BC to all RT
- 0 RT to BC
- 0 Housekeeping messages (mode codes).
- Message format:
- 0 Command word from bus controller
- 0 Data from RT to/from bus controller
-
- 0 Status word from RT
0 The 5 bits address can only support 32
remote terminals.
The T/R bits will determine receiving or
transmission mode, 1=transmit and 0 = receive data
Subaddress allow access to RT subaddress.
Source:
https://www.youtube.com/watch?v=ovxxCFiKje4
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