Becker BD406, Руководство оператора

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Becker Avionics
Installation and Operation
Targets Status Protocol - IF3 Interface
DV16401.03 Issue 04 May 2021 BD406/PBD406 73
2.10 Targets Status Protocol - IF3 Interface
This subchapter describes the broadcasting protocol of the IF3 interface of the BD406 device.
• The protocol is used for reporting status information about all targets stored in BD406
device.
•
It uses unidirectional broadcasting transmission compliant with RS232.
•
Only outgoing transmission from the BD406 IF3 interface is available (BD406 is a
transmitter).
• It is recommended that the device which receives these packets (receiver) meets
requirements from "Recommended Receiver Operation" page 80.
Term Definition
Term Description
#TN
Maximal number of the supported beacons / NavPoints, equal to 49.
CDI To The Target
Angular difference between True Bearing and Device True Course Over
Ground (result is always positive number in 0…360 degrees).
Data
Information transmitted from one device to another one.
Frame
Complete block of information (from protocol point of view).
Frame Header
Byte which specifies the type of data the incorporated in the frame and the
frame type.
Frame ID
Identifier of the data incorporated in the frame.
Frame Length
Length of frame, in bytes.
Frame Type
Permits distinguishing of the QUERY / VALUE frames.
Invalid
Means that data are unknown or unreliable.
Message Counter
Number of messages received from single beacon (unique for each
15HexID).
Packet
Block of bytes for transmission single frame.
Packet CRC
Checksum which protects packet integrity.
Packet Header
First byte of the Packet.
Physical Frame
Constant length, constant duration sequence of bits transmitted by
physical layer.
This is minimal portion of the information transmitted by physical layer.
Single physical frame can carry 8 bits of data (1 byte).
Protocol ID
Unique identifier of the protocol.
Receiver
Device which receives data.
Start Bit
First bit of physical frame.
Stop Bit
Last bit of physical frame.
Target
NavPoint or beacon.
Transmitter
Device which transmits data.
Valid
Means that data are reliable.
Value Block
Data part of the frame.
Table 1: Target Status Protocol - Term Definition