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EM-1240-LX User’s Manual Introduction
1-11
Serial Console Port
The serial console port is a 4-pin pin-header RS-232 port. It is designed for serial console
terminals, which are useful for identifying the EM-1240-LX boot up message.
Serial Console Port & Pinouts
Serial Console Cable
4
3
2
1
Pin Signal
1 TxD
2 RxD
3 NC
4 GND
Internal SD Socket
The EM-1240-LX provides an internal SD socket for storage expansion. It allows users to plug in a
Secure Digital (SD) memory card compliant with the SD 1.0 standard for up to 1 GB of additional
memory space. To install an additional SD card, you must first remove the EM-1240-LX’s outer
cover to access the slot. The internal SD socket is located at the backside of the EM-1240-LX
bottom board; you can find the SD plug-in slot at the right of the EM-1240-LX, lower than the
cover screw. Plug the SD card into the socket directly and remember to press the SD card first if
you want to take it out. Please note that the SD function shares the same chipset with DIO. If you
would like to enable SD function, the DIO must be disabled. If you would like to enable DIO, the
SD function must be disabled.
Additional Functions
Reset Button
Press the Reset button on the EM-1240-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-1240 Development Kit.