Aaeon EMB-BT1, User Manual, Page: 29 / 44

2-21
Chapter 2: Motherboard information
14. 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.
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.
PIN 1
COM3
DCD TXD GND RTS
RI
RXD DTR DSR CTS
PIN 1
COM4
DCD TXD GND RTS
RI
RXD DTR DSR CTS
PIN 1
COM5
DCD TXD GND RTS
RI
RXD DTR DSR CTS
PIN 1
COM6
DCD TXD GND RTS
RI
RXD DTR DSR CTS
EMB-BT1
Serial port connector
PIN 1
COM1
DCD TXD GND RTS
RI/+12V/+5V
RXD DTR DSR CTS
Pin Signal Pin Signal
1 DCD (422TXD-/485DATA-) 2 RXD ()
3 TXD (/) 4 DTR (422RXD-)
5 GND 6 DSR
7 RTS 8 CTS
9 RI/+12V/+5V 10 N.C.