Matrix-orbital VK202-25 Legacy Manual do Utilizador

VK202-25Technical ManualRevision: 3.0

2.1.1 Power ConnectionsPower is applied via pin1 and ground via pin 4 as shown in the figure below. Power requirement is +5VDC ±0.25V. As an alternate

Figure 4: Wiring for 5V ModulesMatrix Orbital can supply an adapter cable designed for use with the display when it’s installed in a PC.The cable is w

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

Figure 8: RS-232 and Power ConnectorFigure 9: Power Applied via DB9The RS-232 connector on the PC cable is wired so that a standard ‘straight through’

5 329Figure 10: DB9 PinoutFor RS232 communication via the 4 pin connector, please see the figure and table below.1 2 3 4 12 34Figure 11: Power Connecto

Figure 12: TTL SelectNote that this device uses signal levels from 0V to + 5V on the TTL setting.Table 6: RS-232 PinoutPin Number Direction Descriptio

Table 7: Connector PinoutPin 1 +5.0 VDC (+7 to +15 VDC with wide voltage option)Pin 2 Rx (receive data)Pin 3 Tx (transmit data)Pin 4 Ground2.2.3 I2C C

Table 8: Connector PinoutPin 1 +5.0 VDC (+7 to +15 VDC with wide voltage option)Pin 2 I2C SDL (clock)Pin 3 I2C SDA(data)Pin 4 Ground2.2.4 ACKThe idea

GNDData+5VFigure 16: 1-Wire Pinout2.3 General Purpose OutputsThe display has six general purpose outputs. These are provided to control relays or othe

Figure 18: Bypassing 240 ohm ResistorNOTE The GPOs do not have any over current or over / under voltage protection so caremust be taken when using the

ContentsContents ii1 Introduction 11.1 What to Expect From the VK202-25 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11.2 What Not to E

3.1 GeneralText is displayed on the VK202-25 using the built in 5x7 dot matrix font. In addition, there are up to 8user defined characters.3.2 The Buil

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

NOTE This command moves the text insertion point even if the cursor is turned off.4 Keypad InterfaceThis chapter describes the keypad interface and as

Table 9: Keypad LayoutColumns1 2 3 4 51 A B C D ERows 2 F G H I J3 K L M N O4 P Q R S T5 U V W X YNOTE The keypad connector must be wired with columns

function.4.5.1 Auto repeat mode on (254 126 [mode]) (R)[mode] = 0x00 gives Resend Key Code mode[mode] = 0x01 gives Key Down / Key Up Code mode1. Resen

4.5.4 Auto transmit keypresses off (254 79) (R)In this mode, up to 10 keypresses are buffered until the unit is polled by the host system via the poll

5.1 Command List5.1.1 Initialize wide vertical bar graph (254 118)This command defines the 8 special / user characters to be blocks suitable for use in

5.1.6 Define custom character (254 78 [c] [8 bytes])The display allows up to 8 user defined (custom) characters. These characters occupy the first 8 (0x0

5.1.7 Initialize Medium Digits (254 109)This command defines the 8 special characters to be blocks suitable for use in drawing medium digits.Any previo

4 Keypad Interface 194.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 194.2 Connections . . . . .

6.1.3 Set brightness (254 89 [brightness]) (R)This command sets the display’s brightness to [brightness], where [brightness] is a value between 0x00an

Table 13: Default ScreenMatrix OrbitalVK202-25The 40 characters define the two 20 character rows of the screen.Table 14: Default ScreenCharacter 1 Char

change in address is immediate. This address is 0x50 by default, and is reset temporarily back to that valuewhen the ’manual over-ride’ jumper is used

6.1.15 Read Serial Number (254 53)This command will return a 2 byte hex value, over the RS-232 interface only, the serial number of themodule as it wa

7 1-Wire CommandsThe 1-wire bus is capable of communicating with many devices over a single wire plus a ground refer-ence. This chapter deals with the

• Match ROM [55h]: To single out a device, the Match ROM command is used. After this com-mand has been issued the 64-bit target address is transmitted

Table 17: 1-Wire TransactionOffset(Bytes)Length(Bytes)Name Description0 1 Flags The flags byte controls the optionalcomponents of the transaction.1 1 S

7.4.2 Search command (254 200 2)This is used to find the addresses of all 1-Wire devices on the bus. After this command the display willreturn one or m

For example (using BASIC in a test setup), the user could issue the command to clear the screen on thedisplay by including the line;In the BASIC progr

Table 22: Example of an ASCII TableThe letter A has a value of 65 Decimal or 41 HexThe letter A has a value of 97 Decimal or 61 HexThe number 0 has a

7 1-Wire Commands 307.1 Device Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 307.2 Protocol . . . . . . .

Command Syntax Default NotesSet cursor position FE 47 [col] [row] 254 71[col] [row] 254 ’G’ [col][row]N/A Moves cursorto the specifiedcolumn and row.Th

8.5 Keypad Interface CommandsTable 25: Keypad Interface CommandsCommand Syntax Default NotesAuto repeat mode on FE 7E [0x00|0x01] 254126 [0|1]254 ’~’

8.6 Bar Graphs and Special CharactersThe commands in this section are used to define and display bar graphs and special characters.Table 27: Bar Graphs

Command Syntax NotesDraw medium digits FE 6F [r][c][digit]254 111 [r][c][digit]254 ’o’ [r][c][digit]Draws a medium digit in [row] and[column] using th

Command Syntax Default NotesRemember FE 93 [0|1]254 147Off Turn the “remem-ber” function on[1] or off [0].Set brightness and save FE 91 [brightness]24

Command Syntax Default NotesRemember FE 93 [0|1]254 147Off Turn the “remem-ber” function on[1] or off [0].Set I2C address FE 33 [address]254 51 [addre

9 Appendix: Specifications and Options9.1 SpecificationsTable 31: Environmental SpecificationsStandard Temperature Extended TemperatureOperating Temperat

Figure 23: Physical Layout9.2 OptionsTable 34: Options Available on VK202-25Extended Temperature EWide Voltage V10 Appendix: GlossaryTable 35: Appendi

Backlight A backlit display is illuminated from behind to providenighttime and improved daytime readability.Binary Number The (data and signaling) bit

I2C Short for Inter-IC, a type of bus designed by PhillipsSemiconductors in the early 1980s, which is used toconnect integrated circuits (ICs). I2C is

1 IntroductionThe VK202-25 comes equipped with the following features:• 20 column by 2 line text vacuum fluorescent display• Built in font with provisi

any aspect of the operation of the display, which acts simply as a matrix to serial converter. To use thekeypad to control the display, the controller

1.5 Trying Out the VK202-25The unit should be connected to power. The PC and display should be on. To experiment with typingtext, run a PC terminal pr

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

GPOs Configuration JumpersPower/Data Connector DB9 ConnectorKeypad Connector1-Wire ConnectorFigure 2: Electrical ConnectionsThe display has four conne