Becker BD406 - Physical Layer

Installation
Becker Avionics
Targets Status Protocol - IF3 Interface
74 BD406/PBD406 DV16401.03 Issue 04 May 2021
Physical Layer
This layer is responsible for data exchange in the physical channel.
Transmission Parameters
The data interchange between the devices takes place through an asynchronous serial
communication interface.
Configurable parameters:
BD406 with control head
BD406 without control head
Bit rate: 1200, 2400, 4800, 9600, 19 200 bps
Data length: 8 bits
Parity: NONE, EVEN, ODD
Stop bits: 1 / 2
Bit rate: 19 200 bps
Data length: 8 bits
Parity: NONE
Stop bits: 1
A physical frame consists of 10/11 bits:
BD406 with control head
BD406 without control head
Start bit (equal to logical 0)
8 bits of data (least significant bit first)
1 / 2 stop bit (equal to logical 1)
1 stop bit (equal to logical 1)
Idle state is equal to logical 1
No handshaking lines are required
Time from start bit beginning to the first stop bit beginning is equal to 9/(bit rate)
Notice: Contact manufacturer for different transmission settings.
Bit Rate Tolerance for Exchanged Physical Frames
The transmitter sends data with a bit rate equal to its nominal value ±1%.
The receiver accepts incoming data transmitted with bit rate equal to its nominal value ±2%.