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Table 11: Main connector pin description 
1  Supply+  Power supply + 
2  Supply-  Power supply - 
3  RS232 Tx  Serial nav data transmit 
4  RS232 Rx  Serial nav data receive 
5  Digital 5   
6  Radio data Tx  Serial radio data transmit 
7  Radio data Rx  Serial radio data receive 
8  Digital 2   
9  CAN+  CAN bus high 
10  CAN-  CAN bus low 
11  Digital 1  Signal ground 
12  RS232 common  Serial nav data common 
13  ETX-  Ethernet transmit - 
14  ERX-  Ethernet receive - 
15  Digital 3   
16  RS232 common  Serial radio data common 
17  CAN ground  Signal ground 
18  Digital ground  Signal ground 
19  Digital 4   
20  ETX+  Ethernet transmit + 
21  ERX+  Ethernet receive + 
22  Ground  Ground 
 
 
Table 12: Auxiliary connector pin description 
1  ERX-  Ethernet receive - 
2  ETX-  Ethernet transmit - 
3  Reserved   
4  Reserved   
5  ERX+  Ethernet receive +