Blaze ALT-7 Operating Manual
Page 15
Pinouts for various transponders
The ALT-7 has a parallel output Gillham interface that can be directly connected to various parallel input transponders
such as those from Garmin, Becker, King, Microair, etc. The output data contains the current pressure altitude with a fixed
reference to 1013.25mB (29.92 inches mercury). The following table is of commonly used transponders and their Gillham
code connections. Please consult your transponders installation manual on the physical position of every contact. Ensure
that you wire the Gillham codes correctly and securely.
Transponder
A1
A2
A4
B1
B2
B4
C1
C2
C4
ARC RT359A/459A/859A
14
13
15
19
17
16
21
18
20
BECKER ATC 2000/3401
16
15
14
17
19
18
22
21
20
BECKER ATC 4401
1
2
3
14
15
16
17
18
19
BENDIX TRP-2060/2061/660
4
6
8
9
10
11
3
5
7
BENDIX TR541A/641B
A
B
C
D
E
F
H
J
K
COLLINS TDR-950/950L
12
10
7
6
5
4
8
11
9
EDO-AIRE RT-777
7
5
3
12
13
14
8
6
4
GARMIN 320/320A/327
3
5
6
9
11
12
10
4
7
GENAVE BETA 5000
4
5
6
7
8
9
10
11
12
KING KT76/78
6
7
9
4
1
2
3
8
10
KING KT76A/78A/76C/79
M
K
J
E
C
B
D
L
H
KING 750A
G
H
J
K
L
M
P
R
S
KING KT75
6
7
8
9
10
11
12
13
14
MICROAIR T2000
9
10
11
12
13
17
18
19
20
NARCO AT50/50A/150
7
6
8
12
10
9
14
11
13
NARCO AT5/6/6A
2
4
8
9
10
11
1
3
5
RADAIR 250
7
6
13
9
10
11
14
16
12
TERRA TRT250/250D
5
17
16
15
2
14
3
4
18
UPS/APPLLO SL70
13
31
12
33
14
32
16
34
15
WILCOX 1014A
K
C
W
T
L
D
P
F
Z
