Becker BD406 - Page 79

Becker Avionics
Installation and Operation
Targets Status Protocol - IF3 Interface
DV16401.03 Issue 04 May 2021 BD406/PBD406 79
Description
Name: Broadcasted NavPoint Info; Frame ID: 1 (0x01); Value Block Length: 53 bytes
Value Block:
Byte 0: Index of the current NavPoint. Range [0…#TN-1]. Unit: none (data type: 8-bit unsigned
integer). 0xFF value denotes Invalid data.
Byte 1: Total count of NavPoints in the NavPoints DB. Range [0…#TN]. Unit: none (data type:
unsigned integer). If this byte is equal to 0x00 it means that all other bytes in this Frame are
Invalid.
Byte 2: Status byte:
• Bits 7…2: not used (always set to 0)
• Bit 1: Distance unit of the Distance To The Target (0 – km, 1 – NM)
• Bit 0: NavPoint Longitude and NavPoint Latitude fields valid (0 – fields invalid, 1 – fields
Valid)
Bytes 3…12: NavPoint Name contents. String of following ASCII characters: ‘space’, ‘-‘, ‘.’, ‘/’
‘0’…’9’, ‘A’…’Z’. Left aligned data. Unused bytes are filled with 0x00.
Bytes 13…32: NavPoint Info. . String of following ASCII characters: ‘space’, ‘-‘, ‘.’, ‘/’ ‘0’…’9’,
‘A’…’Z’. Left aligned data. Unused bytes are filled with 0x00.
Bytes 33…36: NavPoint Latitude: Range [-90.0 … 90.0]. Unit: [1 degree] (data type: 32 bits
floating point). Negative value means south, otherwise north.
Bytes 37…40: NavPoint Longitude
: Range [-180.0 … 180.0]. Unit: [1 degree] (data type: 32 bits
floating point). Negative value means west, otherwise east.
Bytes 41…42: True Bearing, Range [0…3599] plus 0xFFFF. Unit: [0.1 degree] (data type:
unsigned integer). Value equal to 0xFFFF denotes Invalid value.
Bytes 43…44: Distance To The Target
,
Range [0…9999] plus 0xFFFF. Unit: [0.1 distance unit]
(distance unit is defined in byte 2) (data type: unsigned integer). Value equal to 0xFFFF denotes
Invalid value.
Bytes 45…46: CDI To The Target, Range [0…3599] plus 0xFFFF. Unit: [0.1 degree] (data type:
unsigned integer). Value equal to 0xFFFF denotes Invalid value.
Byte 47: Hours of EET
: Range [0 … 23] plus 0xFF. Unit: [1 Hour] (data type: unsigned integer). Value
equal to 0xFF denotes Invalid value.
Byte 48: Minutes of EET: Range [0 … 59] plus 0xFF. Unit: [1 Minute] (data type: unsigned integer).
Value equal to 0xFF denotes Invalid value.
Byte 49: Seconds of EET
: Range [0 … 59] plus 0xFF. Unit: [1 Second] (data type: unsigned integer).
Value equal to 0xFF denotes Invalid value.
Byte 50: Hours of ETA: Range [0 … 23] plus 0xFF. Unit: [1 Hour] (data type: unsigned integer). Value
equal to 0xFF denotes Invalid value. Value reported in this byte includes UTC Offset.
Byte 51: Minutes of ETA: Range [0 … 59] plus 0xFF. Unit: [1 Minute] (data type: unsigned integer).
Value equal to 0xFF denotes Invalid value. Value reported in this byte includes UTC Offset.
Byte 52: Seconds of ETA: Range [0 … 59] plus 0xFF. Unit: [1 Second] (data type: unsigned integer).
Value equal to 0xFF denotes
Invalid
value.
Table 4: Target Status Protocol - Frame Content Description
Packet Broadcasting
• The transmitter sends first one by one the status of all existing beacons (frame ID 0x00)
and then one by one the status of all existing NavPoints (frame ID 0x01).
• The transmitter repeats this process continuously.
• The more beacons and NavPoint in databases the more data are transmitted.
• When none beacons and none NavPoints are in memory - empty frames with byte 1
equal 0 are shown.