15
Board Layout
Chapter 3
Embedded and Industrial Computing
Enable/disable termination for COM1/COM2 (SW3/
SW6)
: Enable the COM1/COM2 termination at RS-422 or
RS-485 mode
RS-485 terminating resistance RX on
RS-232 COM Port 3 (COM3)
: COM3 port is an RS-232
serial port.
PCOM1/2/3
: Select COM1/COM2/COM3 Pin9 Function
(in RS-232). The Ring indicator pinout of the RS-232 COM
port can be altered according to the following jumper
settings.
Jumper Settings
Serial-ATA Connector (SATA1)
: It is for connecting a 2.5’’
SATA SSD 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 (CON2)
: It is for
connecting the SATA power cord.
COM Port 1/2 (COM1/COM2)
: COM1/COM2 ports are
serial ports which are selectable among RS-232/422/485
standards.
RS-232/422/485 Pinout:
Select COM1/COM2 Type Switch (SW4/SW5)
:
Pin No.
Pin Name
RS-232
RS-422
RS-485
1
DCD
TxD-
Data-
2
RXD
TxD+
Data+
3
TXD
RxD+
4
DTR
RxD-
5
GND
Signal Ground
6
DSR
7
RTS
8
CTS
9
RI/5V/12V
COM1 TYPE
Description
RS-232 (Default)
1-ON, 2-OFF, 3-OFF, 4-OFF
RS-422
1-OFF, 2-ON, 3-ON, 4-OFF
RS-485
1-OFF, 2-ON, 3-OFF, 4-ON
Pin No.
Function
1-2
Ring-in (default)
3-4
5V to Device
5-6
12V to Device
LVB-5550 (V1.0)
Pin No.
Function
Pin No.
Function
1
DCD
2
RXD
3
TXD
4
DTR
5
GND
6
DSR
7
RTS
8
CTS
9
RI/5V/12V
Pin No.
Function
1
NC
2
Ground
3
Ground
4
VCC(5V)
Pin No.
Function
1
GND
2
TX+
3
TX-
4
GND
5
RX-
6
RX+
7
GND
7
6
5
4
3
2
1
4 3 2 1
RS-232 (default)
4 3 2 1
ON
RS-422
4 3 2 1
RS-485
Pin No.
Description
1-OFF, 2-OFF,
3-OFF, 4-OFF
Terminating resistance OFF
1-ON, 2-ON,
3-ON, 4-ON
RS-422/RS-485 Terminating resistance Tx, Rx on
1-ON, 2-ON
3-OFF, 4-OFF
RS-485 terminating resistance RX on
Terminating resistance off
1 2 3 4
ON
RS-422 or RS-485 terminating resistance TX, RX on
1 2 3 4
ON
1 2 3 4
ON
6 7 8 9
1 2 3 4 5
5
3
1
6
4
2
6 7 8 9
1 2 3 4 5
2 4 6 8 10
1 3 5 7 9
PCOM1/PCOM2
PCOM3
1 3 5
2 4 6
SW4
SW5
4 3 2 1
ON
4
3
2
1
4
3
2
1
4
3
2
1
SW3
SW6
ON
1
2
3
4
1
2
3
4
ON
ON
1
2
3
4
