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SSD120
DA-15P
Conn.
Function
D4
1
A1
2
A2
3
A4
4
B1
5
B2
9
B4
10
C1
11
C2
13
C4
12
Output
Enable
6
14 to
8 or
28Vdc
14
Input
7
*
Ground
15
The Narco AT-5A, AT-6A, AT-50 or AT-50A transponder will not accept data from the SSD120-(XX)N-RS5
Altitude Digitizer. A modification to remove the output decoupling capacitors is required and the unit may be
ordered from the factory with this modification. Order Model Number SSD120-(XX)N-RS5 with Mod 1.
Please note! The Narco AT-50 and earlier transponder models require a modification before they will
function correctly with any altitude encoder. This modification is outlined in Narco Service Bulletin AT-50A-
5.
6
Data for this connection is not available at this time.
7
Pins 8 and 14 are connected internally.
Table II Cessna, Narco, Microair
Cessna
RT359A,
RT459A,
Narco AT-150
RT859A
AT-50, AT-50A
Pin Number
Pin Number
10
14
13
15
19
17
16
21
18
20
11
9
Connect to
aircraft
Connect to aircraft
ground.
Narco AT-50 and AT-50A Installations
Page 31 of 57
Narco AT-6A
AT-5, AT-6
Pin Number
6
*
7
6
8
12
10
9
14
11
13
5
18
ground.
Microair
T2000
6
*
21
2
9
4
10
8
11
9
12
10
13
11
17
1
18
3
19
5
20
Connect to aircraft
12
ground.
13
2
Connect to aircraft
14
ground.
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