C. 24-bit address reprogramming – hard wire method, Figure 11. octal/hexadecimal to binary conversion – ACR&Artex ELT to Nav Interface Boeing User Manual
Page 49
25-69-11
Page 49 of 58
JUL 28/11
ACR ELECTRONICS, INC / ARTEX PRODUCTS
ABBREVIATED COMPONENT MAINTENANCE MANUAL
-B (453-6501)
(18) Connect the P2 plug to the ELT/NAV Interface -B.
(19) Install the 150-6504 protective cap on the ELT/NAV Interface -B P1 plug, if the 24-bit address
reprogramming option is not used.
(20) Test the installation in accordance with the procedure outlined in SUBTASK 25-69-11-750-001,
on page 34.
SUBTASK 25-69-11-450-002
C. 24-Bit Address Reprogramming – Hard Wire Method
(1)
The 24-bit address is composed of binary “1s” and “0s”, with a “1” electrically grounded to the
airframe and “0” electrically open.
(2)
Encoding is accomplished by either “hard wiring” the respective “1” pins to ground or by using
a 24-bit address switch block, which internally grounds selected addresses. Hard wiring is the
preferred method. See SUBTASK 25-69-11-450-003, on page 50, for 24-bit address switch
block instructions.
(3)
Determine the appropriate binary 24-bit address based on the octal or hexadecimal ID code
assigned to the aircraft. See "Figure 11. Octal/Hexadecimal to Binary Conversion".
Figure 11. Octal/Hexadecimal to Binary Conversion
(4)
Prepare the number of ground wires (binary “1”) necessary to encode the 24-bit address as
follows:
(a)
Strip approximately 0.19 in. (5 mm) of insulation from the ends of each of the ground
wire.
MSB
LSB
ADDRESS 1
ADDRESS 24
1
0
1
0
0
0
0
0
1
0
1
1
1
0
0
0
0
0
1
0
1
1
1
1
ICAO Octal Address to 24-Bit Binary
4
0
5
7
5
0
1
3
1
0
1
0
0
0
0
0
1
0
1
1
1
0
0
0
0
0
1
0
1
1
1
1
A
0
B
8
2
F
ICAO Hex Address to 24-Bit Binary
MSB
LSB
ADDRESS 1
ADDRESS 24
Example No. 1: Converting ICAO address 50134057 (octal) to
binary 24-bit address
Example No. 2: Converting ICAO address A0B82F (hexadecimal) to
binary 24-bit address
1 1 1 0
1 1 1 1
Hex
Binary
1 0 1 0
1 0 1 1
1 1 0 0
1 1 0 1
0 1 1 0
0 1 1 1
1 0 0 0
1 0 0 1
E
F
0 0 0 0
0 0 0 1
0 0 1 0
0 0 1 1
0 1 0 0
0 1 0 1
A
B
C
D
6
7
8
9
2
3
4
5
Hex
0
1
Binary
HEXADECIMAL/BINARY
EQUIVALENTS
7
1 1 1
5
1 0 1
6
1 1 0
3
0 1 1
4
1 0 0
1
0 0 1
2
0 1 0
Octal
Binary
0
0 0 0
OCTAL/BINARY
EQUIVALENTS