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EM-1220 Hardware User’s Manual EM-1220-DK Functionality

Console Ports and Pin Assignments

The serial console port on the EM-1220-DK is a 4-pin pin-header RS-232 port, which support TxD,

RxD, and GND signals. It is designed for serial console terminals, which can be used for local

configuration and identifying the EM-1220-LX boot up message. The pinouts of this RS-232

console port are shown in the figure below.

3-5

Serial Console Port & Pinouts Serial Console Cable

Pin Signal

1 TxD

2 RxD

3 NC

4 GND

LAN Ports and Pin Assignments

The EM-1220 Development Kit has two 10/100 Mbps LAN ports. Connect one end of the Ethernet

cable to the Development Kit LAN port and the other end of the cable to the Ethernet network.

The LAN ports use 8-pin RJ45 connectors. See the following diagram for the pinouts.

8-pin RJ45

Pin Signal

1 ETx+

2 ETx-

3 ERx+

4 ---

5 ---

6 ERx-

7 ---

8 ---

SD Socket

The EM-1220 Development Kit provides an internal SD socket for storage expansion. The socket

allows users to use a Secure Digital (SD) memory card compliant with the SD 1.0 standard for

adding up to 1 GB of additional memory space. Plug the SD card directly into the socket.

Remember to press the SD card first if you want to remove it. Note that the SD will not work if

you enable the GPIO function. Refer to the section about the EM-1220’s SD function to see a table

that describes the SD card interface.

Reset Button

Press the Reset button on the EM-1220-DK continuously for at least 5 seconds to load the factory

default configuration. After the factory default configuration has been loaded, the system will

reboot automatically. We recommend that you only use this function if the software is not working

properly and you want to load factory default settings. To reset an embedded Linux system, always

use the software reboot command />reboot to protect the integrity of data being transmitted or

processed. The Reset button is not designed to hard reboot the EM-1220 Development Kit.

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