AAEON EMB-BT1 - Manual (Page 29)

2-21 Chapter 2: Motherboard information
13. Serial port connectors (10-1 pin COM1, COM3~COM6)
These connectors are for serial (COM) ports. Connect the serial port module
cable to this connector, then install the module to a slot opening at the back
of the system chassis.
EMB-BT1 Serial Port Connector
COM3
DCD TXD GND RTS
RI/+12V/+5V
RXD DTR DSR CTS
PIN 1
COM4
DCD TXD GND RTS
RI/+12V/+5V
RXD DTR DSR CTS
PIN 1
COM5
DCD TXD GND RTS
RI/+12V/+5V
RXD DTR DSR CTS
PIN 1
COM6
DCD TXD GND RTS
RI/+12V/+5V
RXD DTR DSR CTS
PIN 1
COM1
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.
NOTE:
• The COM module is purchased separately.
• COM1 also supports RS-232 / RS-422 / RS-485. See the table below and
section 3.3.2 Super IO Configuration for details.