Acrosser AES-HM76Z1FL - Manual (Page 29)

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4.2.5. GPIO1, GPIO2, COM1, COM2, COM3, COM4
GPIO2 / COM4
GPI Pin Define:
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
GPIO1 / COM3 COM2, COM1
GPO Pin Define:
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
Only For RS-232 Function
Pin SIGNAL
1 DSR
2 DCD
3 RTS
4 SIN
5 CTS
6 SOUT
7 RI
8 DTR
9 NC
10 GND