Lcd Interface Technical Overview - Toshiba SG20 - Magnia - Web Server Customization Manual

Customization
This section describes the LCD panel operation, its interface, the software controlling
message display, and how to display information on the panel directly without using the
Magnia SG20-provided software. There are two methods to interact with the Magnia
SG20 LCD panel. When using the Magnia SG20 preinstalled software, interaction with
the LCD panel is direct, through the LCD daemon. If using your own software preinstall
image that does not include the Magnia SG20 software for LCD management, you can
create your own programs and procedures to interact with the LCD panel and the system
buttons.

LCD interface technical overview

The Magnia SG20 contains two main boards. The PC motherboard contains most of the
controllers and interfaces normally associated with a PC, including the CPU, IDE
controllers, serial and parallel port controllers, and so forth. A second board, the
mezzanine board, contains some additional components such as the internal built-in
Ethernet switch and the system LCD firmware.
LCD Select Button
Power Button
Communications to the LCD display are transmitted from the operating system software
running on the main system board through the COM1 serial port. The LCD controller
firmware listens to the serial port and displays characters sent through this serial port.
The LCD panel is a two-line display. Each line can display up to 16 characters.
In addition to display and control of the LCD panel, the LCD firmware monitors and
reports the button presses of the LCD select button and the soft power button, both
located on the front of the Magnia SG20.
Mezzanine
LCD Firmware
LCD Display
LCD panel customization
Motherboard
COM1
Serial Port
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