AAEON EMB-Q77A - Manual (Page 34)

EMB-Q77A 2-26
10. Serial port connectors (10-1 pin COM1, COM2)
These connectors are for serial (COM) ports. Connect the serial port module
cables to these connectors, then install the module to a slot opening at the
back of the system chassis.
EMB-Q77A Serial port connector
PIN 1
COM1
DCD TXD GND RTS
RI/+12V/+5V
RXD DTR DSR CTS
PIN 1
COM2
DCD TXD GND RTS
RI/+12V/+5V
RXD DTR DSR CTS
Pin Signal Pin Signal
1 DCD (422TXD-/485DATA-) 2 RXD (422RXD+)
3 TXD (422TXD+/485DATA+) 4 DTR (422RXD-)
5 GND 6 DSR
7 RTS 8 CTS
9 RI/+12V/+5V 10 N.C.
NOTES:
• The COM module is purchased separately.
• Only COM1 can support RS-422 and RS-485.