Installation manual

Specifications

Apollo MX20 Installation Manual

3.2 REAR CONNECTOR PINOUTS

Table 8 - MX20 Rear Panel Connector Pinout (J1)

Pin # I/O Name Comment

1 I Power + Main Aircraft Power Input (+10 to +30 VDC)

2 I Power ground Main Aircraft Power Ground

3 I Port 2 GND RS-232

4 I Port 1 IN RS-232

5 O Port 1 OUT RS-232

6 O Port 3 OUT RS-232

7 I Port 3 IN RS-232

8 O Port 4 OUT + RS-422

9 - NC Reserved

10 O Port 4 OUT - RS-422

11 I Port 4 IN + RS-422

12 I Power ground

13 - NC Reserved

14 I Input Flag 1 Discrete Input (Internally Pulled Up)

15 I Input Flag 3 Discrete Input (Internally Pulled Up)

16 I Heater Power + Auxiliary Heater Input (+10 to +30 VDC)

17 O 1 PPS OUT + 1 Pulse Per Second Output (RS422 Level). GPS timing is

referenced to the falling edge of +.

18 - NC Reserved

19 O 1 PPS OUT - 1 Pulse Per Second Output (RS422 Level). GPS timing is

referenced to the rising edge of -.

20 I Power ground

21 I Port 2 IN Port 2 RS-232 RxD

22 O Port 2 OUT Port 2 RS-232 TxD

23 I Port 1 GND RS-232

24 O Reserved (Power) NC In Aircraft Install

25 I Port 3 GND RS-232

26 I Port 4 IN - Port 4 RS-422 RxD -

27 I Reserved (Ground) NC In Aircraft Install

28 I Reserved (Data) NC In Aircraft Install

29 I Reserved (Clock) NC In Aircraft Install

30 - NC Reserved

31 - NC Reserved

32 - NC Reserved

33 I Input Flag 2 Discrete Input (Internally Pulled Up)

34 I Input Flag 4 Discrete Input (Internally Pulled Up)

35 - NC Reserved

36 I External Power Switch External Power Switch (Gnd to Turn On)

37 - NC Reserved