990.014 MuIn LCD - User manual [EN]

MuIN LCD Board is a multi-interface LCD display controller compatible with HD44780 chipset and similars. When a fully-featured remote display consolle is needed (without waste of time and money), the MuIN LCD is the right choice!

The MuIN LCD Board can be interfaced to other applications by a variety of connections: USB, UART (TTL and CMOS), RS485 and XBee. The messages are displayed instantly sending the data in ASCII format over the selected serial connection. The characters will be displayed in the same order they are sent, starting from the cursor location. Pagination and carriage return are automatic: at the end of the last row, the cursor will go on the beginning of display. The MuIN LCD Board can also displays bar-graphs, an useful feature for analog values representation. MuIN is equipped with a powerful piezo-speaker that can play tones with frequency between 240 and 4400Hz with a duration from 20mSec to 2.5Sec. The backlight can be turned off or adjusted by software. The LCD contrast is adjusted with a trimmer. MuIN LCD Board can operates with LCD displays that have 2 or 4 rows and 16 or 20 columns. The LCD size can be selected by software or using the test GUI.
The commands set is compatible with Matrix Orbital LCD displays.



Technical specifications

• Power supply: from 6 to 9Vdc
• Current consumption: 60mA (backlight off) - 200mA (backlight on at full intensity)
• USB port 2.0 full speed, CDC device with serial port emulation, XP/Vista/Win7 compatible with provided driver (can be downloaded below). Linux uses native driver (Linux could be need an update)
• RS485 port with line terminator, 120Ohms, jumper-selectable bias
• UART TTL and CMOS 3.3V compatible, TTL level output

Only one serial communication method can be selected, at a time, by using the dedicate jumper:



USB port doesn't need any selection and can be used also for LCD and XBee power supply. The backlight intensity can be adjusted by software, the contrast is adjusted by a trimmer.

On-board there are two 22Ohm resistors used to limitate the LCD backlight current, if your display is already equipped with current-limitation resistors, the on-board resistors can be excluded by soldering a jumper for each resistor in order to obtain the right light intensity.

Display connector pinout

The display connector follows the standard used by the most of HD44780-based LCD Display. Only 4 data line are used (4bit mode):

• GND: common ground
• V+: 5Vdc power supply
• Vc: contrast adjustment
• RS: register select
• RW: Read/Write
• EN: Enable
• D4: data bus, bit 4
• D5: data bus, bit 5
• D6: data bus, bit 6
• D7: data bus, bit 7
• A: backlight led's anode (+)
• K: backlight led's cathode (-)

UART connector pinout

• +5V: 5Vdc out, 100mA MAX
• Rx: serial data in
• Tx: serial data out
• GND: common ground

RS485 connector pinout

• A: 'A' terminal for RS485
• B: 'B' terminal for RS485

Soldering Jumpers

• P+: Positive bias RS485 (default: open)
• P-: Negative bias RS485 (default: open)
• TE: RS485 line terminator (default: open)
• SPK EN.: Speaker enable (default: closed)

Jumpers for function selectionLeds

• RSSI: is turned on on Xbee data receive
• ASSOC: flashes when XBee is ready and/or if it is associated (see XBee's datasheet for more infos)
• L1: slow flash indicates status ok, full turned on if MuIN is busy
• L2: flashes when data are received or during command execution

Command set

All commands will start by sending 0xFE (254) value followed by one or more bytes indicates the command and the parameters. The values must be sent in hex format.

System commands
Cursor and visualization commands
Bar-Graph commands
Backlight commandsSpeaker commandsA/D converter