Acrosser AES-HM76Z1FL - Manual (Page 48)

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6.5. USB
There are three USB 3.0 connectors on the main board. USB 3.0 signals are compatible with
USB 2.0 signals. You can connect USB 3.0 or 2.0 devices without any problems. There
are also two USB 2.0 signals used by mini-PCIe and combo USB interface.
6.6. GPI / GPO connector definition
GPI O2 / COM4 pin definition
PCBA
PIN SIGNAL PIN SIGNAL
1 GPI0 2 GPI1
3 GPI2 4 GPI3
5 GND 6 GND
7 TX4+ 8 TX4-
9 RX4+ 10 RX4-
11 GPI4 12 GPI5
13 GPI6 14 GPI7
15 Reserved 16 NC
DB15
PIN SIGNAL PIN SIGNAL
1 GPI0 2 GPI1
3 GPI2 4 GPI3
5 GND 6 GND
7 TX4+ 8 TX4-
9 RX4+ 10 RX4-
11 GPI4 12 GPI5
13 GPI6 14 GPI7
15 Reserved N/A N/A
GPIO1 / COM3 pin definition
PCBA
PIN SIGNAL PIN SIGNAL
1 GPO0 2 GPO1
3 GPO2 4 GPO3
5 GND 6 GND
7 TX3+ 8 TX3-
9 RX3+ 10 RX3-
11 GPO4 12 GPO5
13 GPO6 14 GPO7
15 Reserved 16 NC
DB15
PIN SIGNAL PIN SIGNAL
1 GPO0 2 GPO1
3 GPO2 4 GPO3
5 GND 6 GND
7 TX3+ 8 TX3-
9 RX3+ 10 RX3-
11 GPO4 12 GPO5
13 GPO6 14 GPO7
15 Reserved N/A N/A