LCD4021 User Manual Important: Read pages 2 and 3 before applying power.
Connecting LCD4021 Regular Voltage Power is applied to the white or brown four pin SIP connector as follows: Pin 1: Pin 2: Pin 3: Pin 4: +5V DC =SCL (I²C Clock) =SDA (I²C Data) Gnd If the sole data source is via the RS-232, the data input is via the DB-9 connector. Pins 2 and 3 are not used.
DB-9 Connector Pin Out RS-232 port: This connector is wired so that a standard “straight through” 9 pin D-sub cable may be used to connect the modules on a standard serial port such as comm ports on PCs. Note that this device complies to the EIA232 standard in that it uses signal levels from +/- 3V to +/- 12V. It will not operate correctly at TTL (0 to +5V) levels. Pin Number 2 3 5 9 Description Data Out Data In Ground +5Vdc Note: Signals are shown as interpreted by the Liquid Crystal Display module.
Configuring LCD4021 Default configuration is J1 and J2 installed. This configures the RS-232 to 19 200 baud and I²C to slave address 0x5C depending on which connector is used. Please refer to the Appendix of this manual for programming notes.
LCD4021 Command Set Write Text This section of the manual allows the user to send commands to the LCD to alter the appearance or behavior of the display. To utilize a command, the user must send a command prefix followed by the command in the format described in this portion of the manual. Any characters sent without a command prefix will be interpreted as text and will be displayed on the module at the current cursor position. The current cursor position will be incremented for each character received.
Backlight Off ASCII 'F', Hex 46, Decimal 70 Syntax 0xFE 0x46 To turn the backlight off, send a command prefix followed by the character 'F'. Clear Display ASCII 'X', Hex 58, Decimal 88 Syntax 0xFE 0x58 This command clears any text and graphics off the display. To clear the display, send a command prefix followed the character 'X'. Contrast ASCII 'P', Hex 50, Decimal 80 Syntax 0xFE 0x80 This command allows you to set the display contrast to a level between 0(light) and 256(dark).
Cursor Blink Off ASCII 'T', Hex 54, Decimal 84 Syntax 0xFE 0x54 To turn off the blinking cursor at the current position send a command prefix followed by the character 'T'. Create Custom Character ASCII 'N', Hex 4E, Decimal 78 Syntax 0xFE 0x4E<8 bytes> This command creates a custom character. For the LCD4021 the user can have up to eight custom characters. To execute this command, send a command prefix followed by the character 'N'.
Go To Position ASCII 'G', Hex 47, Decimal 71 Syntax 0xFE 0x47 To set the current cursor position, send a command prefix followed by the character 'G' and two values defining the column and row of the desired cursor position.
Initialize Thin Bar Vertical Graph ASCII 's', Hex 73, Decimal 115 Syntax 0xFE 0x73 This command is executed in exactly the same manner as the 'Initialize Thick Bar Graph' command. Make Vertical Bar Graph ASCII '=', Hex 3D, Decimal 61 Syntax 0xFE 0x3D This command places a bar graph at the specified column with the specified height. The style of the vertical bar graph whether it be thick or thin is selected by the initialize vertical bar graph command.
LCD Character Font Chart 10
Specifications Environmental Specifications Standard Temp. Extended Temp. 0º to +50º C -20º to +70º C -20º to +70º C -40º to +85º C 90% max non-condensing Operating Temperature Storage Temperature Operating Relative Humidity Electrical Specifications 4.75 - 5.25 Vdc (optional 7 - 15Vdc) 10mA typical 90mA typical Supply Voltage Supply Current Backlight Supply Current Optical Specifications 80 (20 Characters x 4 Lines) 5 x 7 with underline 155.10 x 16.50 mm (XxY) 3.20 x 5.
LCD4021 12
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