# D-Sub DB-25 Pin Assignments #### AES I/O I/O Mode can be configured in the software to set the physical connectors between 8×8 I/O channels and 4×12 I/O channels. Please note: AES3 is running digital audio in channel pairs (stereo) on one physical pin.
Pin (Female Connector) I/O Mode: 8×8 I/O I/O Mode: 4×12 I/O
1 Output Pair 4 + Output Pair 4 +
2 Ground Ground
3 Output Pair 3 - Output Pair 3 -
4 Output Pair 2 + Output Pair 2 +
5 Ground Ground
6 Output Pair 1 + Output Pair 1 +
7 Input Pair 4 + Output Pair 6 +
8 Ground Ground
9 Input Pair 3 - Output Pair 5 -
10 Input Pair 2 + Input Pair 2 +
11 Ground Ground
12 Input Pair 1 - Input Pair 1 -
13 Not Used Not Used
14 Output Pair 4 - Output Pair 4 -
15 Output Pair 3 + Output Pair 3 +
16 Ground Ground
17 Output Pair 2 - Output Pair 2 -
18 Output Pair 1 + Output Pair 1 +
19 Ground Ground
20 Input Pair 4 - Output Pair 6 -
21 Input Pair 3 + Output Pair 5 +
22 Ground Ground
23 Input Pair 2 - Input Pair 2 -
24 Input Pair 1 + Input Pair 1 +
25 Ground Ground
#### Analog I/O I/O Mode can be configured in the software to set the physical connectors between 8×8 I/O channels and 4×12 I/O channels. The outputs on the Analog I/O connectors thus are labeled to be the upper 4 of the total 12 outputs.
Pin (Female Connector) Mode: 8×8 I/O Mode: 4×12 I/O
1 Input 8 + Output 12 +
2 Ground Ground
3 Input 7 - Output 11 -
4 Input 6 + Output 10 +
5 Ground Ground
6 Input 5 + Output 9 +
7 Input 4 + Input 4 +
8 Ground Ground
9 Input 3 - Input 3 -
10 Input 2 + Input 2 +
11 Ground Ground
12 Input 1 - Input 1 -
13 Not Used Not Used
14 Input 8 - Output 12 -
15 Input 7 + Output 11 +
16 Ground Ground
17 Input 6 - Output 10 -
18 Input 5 + Output 9 +
19 Ground Ground
20 Input 4 - Input 4 -
21 Input 3 + Input 3 +
22 Ground Ground
23 Input 2 - Input 2 -
24 Input 1 + Input 1 +
25 Ground Ground
#### Analog Outputs
Pin (Female Connector) Function
1 Output 8 +
2 Ground
3 Output 7 -
4 Output 6 +
5 Ground
6 Output 5 -
7 Output 4 +
8 Ground
9 Output 3 -
10 Output 2 +
11 Ground
12 Output 1 -
13 Not Used
14 Output 8 -
15 Output 7 +
16 Ground
17 Output 6 -
18 Output 5 +
19 Ground
20 Output 4 -
21 Output 3 +
22 Ground
23 Output 2 -
24 Output 1 +
25 Ground