24-Bit Address Reprogramming - Hard Wire Method; Figure 11. Octal/Hexadecimal To Binary Conversion - COBHAM ELT/NAV INTERFACE Abbreviated Component Maintenance Manual

(18) Connect the P2 plug to the ELT/NAV Interface.
(19) Install the 150-6504 protective cap on the ELT/NAV Interface P1 plug, if the 24-bit address
reprogramming option is not used.
(20) Test the installation in accordance with the procedure outlined in SUBTASK 25-69-10-750-001,
on page 34.
SUBTASK 25-69-10-450-002
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 25-69-10-450-003, 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".
Example No. 1: Converting ICAO address 50134057 (octal) to
binary 24-bit address
5
1 0 1
ADDRESS 1
Example No. 2: Converting ICAO address A0B82F (hexadecimal) to
binary 24-bit address
A
1 0 1
ADDRESS 1
(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 each end of each of the ground
wire.
COBHAM AVIONICS WULFSBERG ELECTRONICS
ABBREVIATED COMPONENT MAINTENANCE MANUAL
453-6500
ICAO Octal Address to 24-Bit Binary
0 1 3
0 0 0 0 0 1 0 1
ICAO Hex Address to 24-Bit Binary
0 B
0 0 0 0 0 1 0 1
OCTAL/BINARY
EQUIVALENTS
Octal Binary
0 0 0 0
1 0 0 1
2 0 1 0
3 0 1 1
4 1 0 0
5 1 0 1
6 1 1 0
7 1 1 1

Figure 11. Octal/Hexadecimal to Binary Conversion

4 0
1 1 0 0 0 0 0 1
8 2
1 1 0 0 0 0 0 1
HEXADECIMAL/BINARY
EQUIVALENTS
Hex Binary Hex Binary
0 0 0 0 0 8 1 0 0 0
1 0 0 0 1 9 1 0 0 1
2 0 0 1 0 A 1 0 1 0
3 0 0 1 1 B 1 0 1 1
4 0 1 0 0 C 1 1 0 0
5 0 1 0 1 D 1 1 0 1
6 0 1 1 0 E 1 1 1 0
7 0 1 1 1 F 1 1 1 1
25-69-10
5 7
0 1 1 1 1
ADDRESS 24
F
0 1 1 1 1
ADDRESS 24
Page 49 of 58
APR 06/10