AAEON EMB-KB1 - Manual (Page 29)

2-21 Chapter 2: Motherboard information
EMB-KB1 BIOS Programmable Connector
PIN 1
SPI1
GND SPI_CLK SPI_MOSI (NC)
+V3.3SPI SPI_CS# SPI_MISO
(NC)
11. BIOS programmable connector (8-pin SPI1)
Use this connector to flash the BIOS ROM.
12. Serial port connectors (10-1 pin 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.
PIN 1
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
EMB-KB1 Serial port connector