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Board Layout

Chapter 3

Embedded and Industrial Computing

SW2: Select COM2 and COM3 Termination in RS-

485 This switch is used to enable or disable the signal

termination for COM2 and COM3. 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.

RS-232/422/485 Serial Port (COM3~COM6, CN2): It has

4 serial ports through terminal block connector. Note that

only COM3 can select among RS232/422/485.

SC3T1 and SC3T2: Select COM3 Protocol Setting

RS-232

RS-422

RS-485

Switch

Protocol

SC3T1 SC3T2

RS-232

(Default) 1-2 1-5

2-6

3-7

4-8

RS-422

3-4 5-9

6-10

7-11

8-12

RS-485

5-6 5-9

6-10

7-11

8-12

Note: When using RS-422/RS-485 in COM2, you

must enable the “Serial Port2/3 RS485 driver”

option first in the BIOS menu.

LAN1/LAN2 Ports (LANB1/LANB2): The LAN ports are

provided by RTL8111E-VB-CG Ethernet controller whose

interface complies with PCI-e 1.1 (2.5 Ghz) and IEEE

802.3az Draft 3.0 (EEE). It has advanced management

features including Wake-on-LAN and remote wake-up .

Pin No. Description

Fast Ethernet Gigabit Ethernet

1 TX+ MD0+

2 TX- MD0-

3 RX+ MD1+

4 T45 MD2+

5 T45 MD2-

6 RX- MD1-

7 T78 MD3+

8 T78 MD3-

Clear CMOS jumper (CMOS1): It is for clearing the CMOS

memory.

Digital I/O (DGIO1)

Digital IN/OUT(DIO1) Connector: The 8 pins of General

Purpose Input/Output (GPIO) support input and output

operations through the DB-9 female connector.

TTL Level is +5V; Maximum input current for each port

is 10mA; Maximum output current for each port is

100uA

Input/Output Voltage Logic Register

0~2V Low 0

2~5V High 1

Pin No. Pin Name

1-2 Normal (Default)

2-3 Clear CMOS

Pin No. Pin Name

RS-232

1 RTS5#

2 RxD5

3 TxD5

4 CTS5#

5 CGND

6 RTS6#

7 RxD6

8 TxD6

9 CTS6#

10 DGND

Pin No. Pin Name

RS-232 RS-422 RS-485

11 RTS3# TX- DATA-

12 RxD3 TX+ DATA+

13 TxD3 RX+

14 CTS3# RX-

15 EGND

16 RTS4#

17 RxD4

18 TxD4

19 CTS4#

20 FGND

SW2

OFF

COM Port Pin Number Termination

COM2 Selector 1, 2 on/off Enable/Disable

COM3 Selector 3,4 on/off Enable/Disable

The default setting is “Disable”

SC2T1

SC2T2

1 2 3

10 9 8 7 6 5 4 3 2 1

20 19 18 17 16 15 14 13 12 11

COM6 COM5

COM4 COM3

Note: The orientation

of CN2 illustrated here

is opposite of the one

on the front panel.

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 40 41

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