Rear Connector Pin Outs; Mx20 Rear - Garmin MX20 Installation Manual

Specifications

3.2 Rear Connector Pin Outs

Pin # I/O
1 I
2 I
3 I
4 I
5 O
6 O
7 I
8 O
9 -
10 O
11 I
12 I
13 -
14 I
15 I
16 I
17 O
18 -
19 O
20 I
21 I
22 O
23 I
24 O
25 I
26 I
27 I
28 I
29 I
30 -
31 -
32 -
33 I
34 I
35 -
36 I
37 -
52
Table 3-5. MX20 Rear Panel Connector Pin Out (J1)
Name
Power +
Power ground
Port 2 GND
Port 1 IN
Port 1 OUT
Port 3 OUT
Port 3 IN
Port 4 OUT +
NC
Port 4 OUT -
Port 4 IN +
Power ground
NC
Input Flag 1
Input Flag 3
Heater Power +
1 PPS OUT +
NC
1 PPS OUT -
Power ground
Port 2 IN
Port 2 OUT
Port 1 GND
Reserved (Power)
Port 3 GND
Port 4 IN -
Reserved (Ground)
Reserved (Data)
Reserved (Clock)
NC
NC
NC
Input Flag 2
Input Flag 4
NC
External Power Switch
NC
560-1025-09 Rev E
Comment
Main Aircraft Power Input (+10 to +30 VDC)
Main Aircraft Power Ground
RS-232
RS-232
RS-232
RS-232
RS-232
RS-422
Reserved
RS-422
RS-422
Reserved
Discrete Input (Internally Pulled Up)
Discrete Input (Internally Pulled Up)
Auxiliary Heater Input (+10 to +30 VDC)
1 Pulse Per Second Output (RS-422 Level). GPS timing is
referenced to the falling edge of +.
Reserved
1 Pulse Per Second Output (RS-422 Level). GPS timing is
referenced to the rising edge of -.
Port 2 RS-232 RxD
Port 2 RS-232 TxD
RS-232
NC In Aircraft Install
RS-232
Port 4 RS-422 RxD
NC In Aircraft Install
NC In Aircraft Install
NC In Aircraft Install
Reserved
Reserved
Reserved
Discrete Input (Internally Pulled Up)
Discrete Input (Internally Pulled Up)
Reserved
External Power Switch (Gnd to Turn On)
Reserved
MX20 Installation Manual