Owner manual
25-69-10
Page 49 of 58
APR 30/12
ARTEX PRODUCTS / ACR ELECTRONICS, INC.
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
453-6500
(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".
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 each end of each of the ground
wire.
MSB
LSB
ADDRESS 1
ADDRESS 24
101000001011100000101111
ICAO Octal Address to 24-Bit Binary
40575013
101000001011100000101111
A0B82F
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
71 1 1
51 0 1
61 1 0
30 1 1
41 0 0
10 0 1
20 1 0
Octal Binary
00 0 0
OCTAL/BINARY
EQUIVALENTS