VK204-25-422-E Matrix Orbital, VK204-25-422-E Datasheet - Page 26

• Manufacturer Part Number: VK204-25-422-E
• Description: VF CHARACTER DISPLAY 20X4 RS422
• Manufacturer: Matrix Orbital
• Series: LK204-25r

Specifications of VK204-25-422-E

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

3. Special Characters
3.1. Creating a Custom
Creates a custom character. Each character is divided into 8 rows of 5 pixels; each data byte represents one row.
Each byte is padded by three zero bits followed by five bits representing each pixel state. A one represents an on
condition while a zero is off. Characters are lost when a new memory bank is loaded, unless they are saved.
ID
Data
3.2. Saving Custom
Provides access to all memory banks to create and save custom characters, graph bars, and large digits. Any new
characters saved will overwrite the old, so care should be taken when writing to any bar or digit memory bank.
Bank structure is shown below.
Bank
ID
Data
3.3. Loading Custom
Loads a bank of custom characters into memory for use. Must be issued before using a bank of characters.
Alternatively, an appropriate initialize command can be used.
Bank
0
Character
Characters
Characters
1 byte, character ID, value between 0 and 7
8 bytes, character pixel data as shown below
1 byte, memory bank ID, value between 0 and 4
1 byte, value between 0 and 7
8 bytes, character pixel data as above
1 byte, memory bank ID, value between 0 and 4
Start-up Characters
Dec
Hex
Dec
Hex
Dec
Hex
ASCII
254 193
254 192
1
FE C1
Data1
Data2
Data3
Data4
Data5
Data6
Data7
Data8
FE C0
254 78
Horizontal Bars
FE 4E
■ N
Bank ID Data
Bank ID Data
000 p1 p2 p3 p4 p5 00001000
000 p1 p2 p3 p4 p5 00010100
000 p1 p2 p3 p4 p5 00001000
000 p1 p2 p3 p4 p5
000 p1 p2 p3 p4 p5 00000100
000 p1 p2 p3 p4 p5 00000100
000 p1 p2 p3 p4 p5
000 p1 p2 p3 p4 p5 00000000
Table 18: Custom Degree Character
Table 19: Custom Character Banks
Bank
Bank
ID Data
ID Data
ID Data
2
Vertical Bars
00000011 3
00000011 3
3
Medium Digits
20
8
8
4
4
0
4
Large Digits
26