AAEON AEC-6977 - Manual (Page 27)

E m b e d d e d C o n t r o l l e r A E C - 6 9 7 7
Chapter 2 Hardware Installation 2 - 10
2.19 RS-232/422/485 Pin DEFINE (COM2)
RS-232 Mode
Pin Signal Pin Signal
1 DCD 2 RXD
3 TXD 4 DTR
5 GND 6 DSR
7 RTS 8 CTS
9 RI
RS-422 Mode
Pin Signal Pin Signal
1 TXD- 2 RXD+
3 TXD+ 4 RXD-
5 Ground 6 N/C
7 N/C 8 N/C
9 N/C
RS-485 Mode
Pin Signal Pin Signal
1 D- 2 N/C
3 D+ 4 N/C
5 Ground 6 N/C
7 N/C 8 N/C
9 N/C
2.20 RS-232 Box Header (COM3)
Pin Signal Pin Signal
1 DCD 2 RXD