30058 Parallax Inc, 30058 Datasheet - Page 21

• Manufacturer Part Number: 30058
• Description: SER LCD 4X20 W/KEYBRD INTERFACE
• Manufacturer: Parallax Inc

Specifications of 30058

• Interface: Serial
• Display Type: LCD - Monochrome
• Display Mode: Reflective
• Viewing Area: 82.20mm L x 18.20mm W
• Backlight: LED - White
• Character Count X Line: 20 x 4
• Module Size (w X H X T): 98 mm x 60 mm x 27.5 mm
• Voltage Rating: 4.75 V to 5.25 V
• Operating Temperature Range: 0 C to + 50 C
• For Use With: 27963 - SOLUTIONS CUBED: MEMKEY
• Dot Size: -
• Dot Pitch: -
• Dot Pixels: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: Q2089249

Select Jumpers as can be seen in Section 2.3 and ensure that pull up resistors, with a nominal value of 1K to
10K, are placed on the SCL SDA communication lines coming from pins two and three of the Data / Power
Connector respectively. The LK204-25 uses 8-bit addressing, with the 8th bit designated as the read write
bit, a 0 designates a write address and a 1 designates a read address. The default read address of the display
module will be 0x51, whereas the write address is 0x50 by default, to change the I
8.2.1.
When writing to the display module, the display will respond with a ACK when the write has successfully
been completed. However if the buffer has been filled, or the module is too busy processing data it will
respond with a NAK. When performing a multiple byte read within one I
the slave should be followed by an ACK to indicate that the master still needs data, and a NAK to indicate
that the transmission is over.
4.1.2 Serial Communication
232 protocol at a default baud rate of 19,200 bps and is capable of standard baud rates from 1200 to 57600
bps. Furthmore the LK204-25 is also capable of reproducing any non-standard baud rate in between using
values entered into our baud rate generation algorithm and set through command 164 (0xA4). The display
module communicates at standard voltage levels of 12V to 12V or at TTL levels of 0 to +5V by setting
the Protocol Select Jumpers to TTL.
4.2 Changing the I
Matrix Orbital
When communicating in I
In addition to being able to communicate via I
Syntax
Parameters
Description
Remembered
This command sets the I
and 0xFF. The I
address is automatically set to one higher. For example if the I
address is set to 0x50, then the read address is 0x51.
NOTE The change in address is immediate.
Always
Hexadecimal
Decimal
ASCII
Parameter
adr
2
C the LK204-25 will send an ACK on the 9th clock cycle when addressed.
2
C Slave Address
2
C write address must be an even number and the read
0xFE 0x33 [adr]
254 51 [adr]
254 “3” [adr]
LK204-25
Length
2
C the LK204-25 communicates natively through the RS-
1
2
C write address of the module between 0x00
Description
The new I
0xFF).
2
2
C transaction, each byte read from
C write address (0x00 -
2
C address see section
2
C write
17