Matrix-orbital VK204-25 Legacy Manual do Utilizador Página 1

VK204-25Technical ManualRevision: 1.0

Figure 6: Wiring for 12V ModulesMatrix Orbital can supply an adapter cable designed for use with the display module when it’s installedin a PC. The ca

complies with the EIA-232 standard in that it uses signal levels from +/- 3V to +/- 12V. It will not operatecorrectly at TTL (0 to +5V) levels.Table 4

Table 5: Serial Baud RatesBaud Rate Slave Address J3 J2 J1 J01200 50H out out out out52H out out out in2400 54H out out in out56H out out in in9600 58

/ write bit. If we take a standard Phillips 7bit address of 45hex this would be in binary 1000101. This is7bits. Matrix Orbital would describe the Phi

Figure 11: Bypassing 240 ohm ResistorNOTE The GPOs do not have any over current or over / under voltage protection socare must be taken when using the

3.1 GeneralText is displayed on the VK204-25 using the built in 5x7 dot matrix font, in addition to up to 8 userdefined characters.3.2 The Built In Cha

fonts.3.3 Writing Text to the DisplayWhen the display receives a character, it displays that character at the position currently defined. Thenext chara

3.4.5 Set cursor position (254 71 [column] [row])This command sets the cursor position (text insertion point) to the [column] and [row] specified. Colu

4.1 GeneralThe display keypad interface processes the keypad row / column matrix into a serial (RS-232 or I2C)data byte stream. Aside from this proces

NOTE The keypad connector must be wired with columns on one side and rows on theother side of the center of the connector. In situations where the key

ContentsContents ii1 Introduction 11.1 What to Expect From the VK204-25 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11.2 What Not to E

In this mode, when a key is held down, the key code is transmitted immediately and no other codes will besent until the key is released. On the releas

4.5.6 Poll keypad (254 38)This command returns any unbuffered keypresses via the RS-232 interface. The host system must beset up to receive the key co

5.1.3 Draw vertical bar graph (254 61 [column] [height])Draws a vertical bar graph in [column] having a height of [height] pixels. The height may rang

Table 7: 8 Byte MapMSB LSB* * * 1 2 3 4 5 Data Byte 1* * * 6 7 8 9 10 Data Byte 2* * * 11 12 13 14 15 Data Byte 3* * * 16 17 18 19 20 Data Byte 4* * *

5.1.8 Place large digit 254 35 [col] [digit]This command allows the large digits to be drawn on the LCD screen. Numbers of almost full displayheight m

6.1.3 Display on (254 66[minutes])This command turns on the display for a time of [minutes] minutes. If [minutes] is zero (0), the displaywill remain

6.1.8 Read Version Number (254 54)This command will return the firmware version number of the display. The command will return a 1-bytehex value.7 Appe

exactly two hexadecimal digits make up one byte, each hex digit representing 4 binary digits (4 bits) as shownhere;Table 11: Hex Value TableBinary Hex

7.4 Text CommandsSyntax in the tables below is given in hex, decimal and decimal with ASCII, in that order, one per line.Table 13: Text CommandsComman

Command Syntax Default NotesCursor left FE 4C254 76254 ’L’Moves the cur-sor one positionto the left. If thecursor is alreadyat the beginningof a line

4.5.1 Auto repeat mode on (254 126 [mode]) . . . . . . . . . . . . . . . . . . . . . . . . 164.5.2 Auto repeat mode off (254 96) . . . . . . . . . . .

Command Syntax Default NotesAuto transmit key pressesonFE 41254 65254 ’A’On Sets auto transmitmode for keypad.Key presses aretransmitted tohost withou

Command Syntax NotesInitialize horizontal bargraphFE 68254 104254 ’h’Initializes the user character set tomake horizontal bar graphs.Define custom char

Command Syntax Default NotesSet brightness FE 59 [brightness]254 89 [brightness]254 ’Y’ [brightness]0x00 0x00 Sets displaybrightness. Com-pensates for

8 Appendix: Specifications and Options8.1 SpecificationsTable 21: Environmental SpecificationsStandard Temperature Extended TemperatureOperating Temperat

WARNINGS• Heavy shock of more then 100G, thermal shock greater then10◦C/minute, direct hit with a hard material to the glass surface(especially to the

Figure 16: Physical LayoutMatrix Orbital VK204-25 32

8.2 OptionsTable 24: Options Available on VK204-25Extended Temperature EWide Voltage VWide Voltage with Efficient Switching Power Supply VPT9 Appendix:

Controller The micro-controller or PC used to control the MatrixOrbital display unitDB-9 The designation of a connector used in the RS232 in-terface:

Scroll To view consecutive lines of data on the display screen.The term scroll means that once the screen is full, eachnew line appears at the bottom

1 IntroductionThe VK204-25 comes equipped with the following features;• 20 column by 4 line text display• Built in font with provision for up to 8 use

1.4 Setup for TestingBefore setting up the application the user may want to try out the display. This is easily done with a PC.If not equipped with a

the baud rate to 19,200. If characters are typed on the keyboard, they should now appear on the displayscreen. Text will wrap around to the next line

NOTES• The keypad connector must be wired with columns on one side and rows on the otherside of the center of the connector. If the keypad isn’t wired

Table 2: Connectors & FunctionsConnector Function14 pin dual header General purpose outputs (6)4 pin Power (5.0 VDC) and I2C commu-nications10 pin

2.1.2 Five Volt ModulesIf the display is used in a PC it becomes tempting to plug a spare power connector into the unit. Don’tdo this! Wiring for the