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Board Layout

Chapter 3

Embedded and Industrial Computing

The LEK-IOA4 board

DC_IN CONNECTOR (CN1): A Phoenix connector for

external power supply.

RS-232 Serial Port (COM3 and COM4) without

hardware auto flow control: It is a RS-232/422/485 port

through the D-SUB9 connector.

Dual USB Port Connector #0 and #1 (USB1):

Pin No. Pin Name

1 DC_GND

2 DC_IN

2 1

6789

12345

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

1 2 3 4

5 6 7 8

Pin No. Pin Name

1 USB power

2 USB2_DAT-

3 USB2_DAT+

4 Signal Ground

5 USB Power

6 USB3_DAT-

7 USB3_DAT+

8 Signal Ground

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 ... 29 30

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