13
Board Layout
Chapter 3
Embedded and Industrial Computing
COM Protocol
Setting
RS-232
RS-422
RS-485
Selector 1
Selector 2
Selector 3
Selector 4
1 ON
2 OFF
3 OFF
4 OFF
1 OFF
2 ON
3 OFF
4 ON
1 OFF
2 OFF
3 ON
4 ON
Default:RS-232 Only
Note:
Enable “serial Port 1 (2 ) RS-485 driver” in
the BIOS when using RS-422/RS-485.
SW5: Select COM1/COM2 Termination in RS-485
This switch is used to enable or disable the signal
termination for COM1 and COM2. We strongly recommend
that you disable termination when the port is configured
as RS-232 and enable it when the port is configured as RS-
485/RS-422
COM Port NO.
Setting
Port No.
Without 120
Ω
Termination
With120
Ω
Termination
Selector 1
Selector 2
COM1
OFF
ON
OFF
ON
Selector 3
Selector 4
COM2
OFF
ON
OFF
ON
Default: all OFF.
PCOM1: Select COM1 pin 9 function
PCOM2: Select COM2 pin 9 function
RS-232 COM Port(COMB1, COM3)
: It is the RS-232 serial
pin header.
Jumper Settings
Serial-ATA Connector (SATA1)
: It is for connecting a 2.5’’
SATA harddisk to be served as your system’s storage. It can
support SATA II which features Data transfer rates up to 3.0
Gb/s (300 MB/s).
4-pin Serial-ATA Power Connector (PS4S1)
: It is for
connecting the SATA power cord.
Serial Port(COM1/COM2)
: It is the RS-232/422/485 port
through the D-SUB9 connector.
RS-232/422/485 Pinout:
SW3: Select COM1 Protocol Setting (SW3)
SW4 : Select COM2 Protocol Setting (SW4)
:
RS-232
RS-422
RS-485
6 7 8 9
1 2 3 4 5
Pin No.
Pin Name
RS-232
RS-422
RS-485
1
DCD
TX+
D+
2
RXD
TX-
D-
3
TXD
RX+
--
4
DTR
RX-
--
5
GND
GND
GND
6
DSR
--
--
7
RTS
--
--
8
CTS
--
--
9
RI
--
--
Pin No.
Function
1
GND
2
TX+
3
TX-
4
GND
5
RX-
6
RX+
7
GND
7
6
5
4
3
2
1
Pin No.
Function
1-2
RS-232 Ring (default)
3-4
+5V
5-6
+10.5V
1
3
5
7
9
2
4
6
8
10
LEB-2055
Pin No.
Function
Pin No.
Function
1
DCD
2
DSR
3
RXD
4
RTS
5
TXD
6
CTS
7
DTR
8
RI
9
GND
10
KEY
Pin No.
Function
1
NC
2
Ground
3
Ground
4
5V
4
3
2
1
4 3 2 1
Off
ON
COM1
COM2
1
3
5
2
4
6
4 3 2 1
SW5
Off
ON
SW5
Off
ON
4 3 2 1
