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

VK204-25Technical ManualRevision: 2.2

1.3 Features• 20 column by 4 line alphanumeric vacuum fluorescent display• Selectable communication protocol, RS-232 or I2C• Optional One-wire interfac

WARNING DO NOT use the standard floppy drive power connector,as this will not provide you with the correct voltage and will damage thedisplay module.Fi

Comport The serial port the displayis plugged in to.Baudrate The communication speedthe display module is setto. (Default 19,200)Figure 12: uProject S

1 DB-9 Connector 5 Power / Data Connector2 Power Through DB9 Jumper 6 Keypad Interface3 GPOs 7 Protocol Select Jumpers4 Manual Override 8 Optional Dal

2.1.1 Power Through DB-9 JumperIn order to provide power through pin 9 of the DB-9 Connector you must place a solder jumper on thePower through DB-9 J

Pin 1 PWR (See table 1)Pin2 Rx \ SCL (I2C clock)Pin3 Tx \ SDA (I2C data)Pin 4 GNDFigure 16: Power Connector and Pin outTable 1: Power RequirementsStan

Figure 17: Protocol Select Jumpers2.4 General Purpose OutputsA unique feature of the VK204-25 is the ability to control relays and other external devi

WARNING If connecting a relay, be sure that it is fully clamped usinga diode and capacitor in order to absorb any electro-motive force (EMF)which will

1. Power off the display module.2. Place a Jumper on the Manual Override pins.3. Power up the display module.4. The display module is now set to its d

2.7 Keypad Interface ConnectorThe VK204-25 provides a Keypad Interface Connector which allows for up to a five by five matrix stylekeypad to be directly

ContentsContents ii1 Getting Started 11.1 Display Options Available . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11.2 Accesso

ohm meter, try using a different power cable, if this does not help try using a different power supply.• The last step will be to check the Power / Da

to inform the module that its responses are to be output via I2C. This can be done by sending command254 /160 / 0 to turn off auto transmission of dat

Table 3: I2C Transaction AlgorithmSTART Toggle SDA high to lowAddress 0x50Information 0x48 0x45 0x4C 0x4C 0x4FSTOP Toggle SDA low to high4.1.3 Serial

ParametersParameter Length Descriptionspeed 1 Hex value corresponding to a baudrate.Description This command sets the RS-232 port to the specified [spe

Remembered AlwaysExamplesCrystal Speed 16 MhzDesired BAUD 13,500speed =crystalspeed8∗ DesiredBaud− 1speed = 148.15− 1speed =16,000, 0008∗ 13,500− 1spe

5.1.1 Character SetFigure 22: Character Set5.1.2 Control CharactersIn addition to a full text set, the VK204-25 display supports the following ASCII C

SyntaxHexadecimal 0xFE 0x51Decimal 254 81ASCII 254 “Q”Description When auto scrolling is on, it causes the display to shift the entiredisplay’s conten

5.6 Set Auto Line Wrap OnSyntaxHexadecimal 0xFE 0x43Decimal 254 67ASCII 254 “C”Description Enabling Auto Line Wrap will allow the cursor to automatica

Description This command will allow you to manually set the cursor position, whichcontrols the text insertion point, by specifying the [col] and [row]

Description This command will move the cursor forward one space. If thiscommand is sent when the cursor is at the bottom right position thecursor will

5.8 Set Cursor Position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 235.9 Go Home . . . . . . . . . . . . . . . . .

SyntaxHexadecimal 0xFE 0x4E [refID] [data]Decimal 254 78 [refID] [data]ASCII 254 “N” [refID] [data]ParametersParameter Length DescriptionrefID 1 Chara

Description New to the VK204-25 has added five non-volatile memory banks forcustom character storage. This is intended to allow you to create yourown c

Description Using this command you may create the custom characters. that will bestored in memory bank zero, which will be used in the startup screen.

6.8 Initialize Large NumbersSyntaxHexadecimal 0xFE 0x6EDecimal 254 110ASCII 254 “n”Description This command will load the default large number charact

6.11 Place Horizontal Bar GraphSyntaxHexadecimal 0xFE 0x7C [Col] [Row] [Dir] [Length]Decimal 254 124 [Col] [Row] [Dir] [Length]ASCII 254 “|” [Col] [Ro

SyntaxHexadecimal 0xFE 0x76Decimal 254 118ASCII 254 “v”Description This command will load the wide vertical bar characters into the volatilememory. If

7.2 General Purpose Output OffSyntaxHexadecimal 0xFE 0x56 [Num]Decimal 254 86 [Num]ASCII 254 “V” [Num]ParametersParameter Length DescriptionNum 1 GPO

Description This command will set the startup state for the GPO on the next powerup. A value of one will cause the GPO to be off on the next startupwh

Description This command will allow you to begin communicating with the deviceson the 1-wire bus by returning a packet containing device informationfo

Description This command will perform a single transaction on the 1-wire bus inthis order:1. Bus Reset.2. Transmit data onto the bus.3. Receive data f

10 Display Functions 4010.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4010.2 Display On . . .

connector. The keypad is scanned whenever a key is pressed;there is no continuous key scan. This meansthat key presses are dealt with immediately with

Description In this mode, up to 10 key presses are buffered until the unit is polled bythe host system, via the poll keypad command 254 38. Issuing th

Remembered No9.6 Set Debounce TimeSyntaxHexadecimal 0xFE 0x55 [time]Decimal 254 85 [time]ASCII 254 “U” [time]ParametersParameter Length Descriptiontim

Description Two auto repeat modes are available and are set via the same command:• Resend Key Mode: 0x00• Key Up/Down Mode: 0x01Resend Key Mode This m

ParametersParameter Length DescriptionKDown 25 Key down codesKUp 25 Key up codesDescription This command will allow you to reassign the key codes that

10.3 Display OffSyntaxHexadecimal 0xFE 0x46Decimal 254 70ASCII 254 “F”Description This command turns the backlight off immediately. The backlight will

Description This command sets and saves the display’s brightness to [brightness],where [brightness] is a value between 0x00and 0x03 (between 0 and 3)

Description This command allows you to switch the remember function on and off.To use the remember function, set remember to on, then set all of these

DescriptionParanoia allows you to lock the module from displaying information, aswell as enables the protection of the filesystem and module settings.E

ParametersParameter Length Descriptionlevel 1 Sets the data lock levelDescription This command will set and save the data lock level. See the Data Loc

1 Getting StartedFigure 1: VK204-25The VK204-25 is an intelligent VFD display designed to decrease development time by providing aninstant solution to

SyntaxHexadecimal 0xFE 0x36Decimal 254 54ASCII 254 “6”Description This command will return a byte representing the version of the module,see the follo

Description This command will return a hex value corresponding to the the modelnumber of the module see the following table:Hex Product ID Hex Product

13 Command Summary13.1 CommunicationsDescriptionSyntaxPageChanging the I2C SlaveAddressHexadecimal 0xFE 0x33 [adr]Decimal 254 51 [adr]ASCII 254 “3” [a

DescriptionSyntaxPageMove Cursor BackHexadecimal 0xFE 0x4CDecimal 254 76ASCII 254 “L”24Move Cursor ForwardHexadecimal 0xFE 0x4DDecimal 254 77ASCII 254

DescriptionSyntaxPageInitialize Narrow VerticalBarHexadecimal 0xFE 0x73Decimal 254 115ASCII 254 “s”30Initialize Wide VerticalBarHexadecimal 0xFE 0x76D

DescriptionSyntaxPagePoll Key PressHexadecimal 0xFE 0x26Decimal 254 38ASCII 254 “&”37Clear Key BufferHexadecimal 0xFE 0x45Decimal 254 69ASCII 254

DescriptionSyntaxPageWrite Customer DataHexadecimal 0xFE 0x34 [data]Decimal 254 52 [data]ASCII 254 “4” [data]45Read Customer DataHexadecimal 0xFE 0x35

Command DescriptionPageHex Dec ASCII0x4F 79 “O” Auto Transmit Key Presses Off 360x51 81 “Q” Auto Scroll On 210x52 82 “R” Auto Scroll Off 220x53 83 “S”

14 Appendix14.1 Specifications14.1.1 EnvironmentalTable 66: Environmental SpecificationsStandard Temperature Extended TemperatureOperating Temperature -

14.2 Physical LayoutMatrix Orbital VK204-25 55

1.2 AccessoriesNOTE Matrix Orbital provides all the interface accessories needed to get your displayup and running. You will find these accessories and

14.3 Optical CharacteristicsTable 68: Optical CharacteristicsNumber of Characters 40 (20 characters by 2 lines)Matrix Format 5 x 7 with underlineDispl

Revision 2.0 Initial RevisionRevision 2.1 Updated extended temperature rangeRevision 2.2 Updated communication summaryTable 69: Revision HistoryMatrix

Figure 5: Breadboard CableFigure 6: Serial Cable 4FTMatrix Orbital VK204-25 3

Figure 7: Communication and 5V Power CableFigure 8: Aluminum MountingsMatrix Orbital VK204-25 4

Figure 9: Keypad MountingsFigure 10: 4X4 KeypadMatrix Orbital VK204-25 5