Matrix-orbital LK204-24-USB Manual do Utilizador

LK204-24-USBTechnical ManualRevision: 1.0

The display has a secondary power connector used for High Power GPOs. Only if the user is planning onusing GPO 4, GPO 5 and GPO 6 as +12V, should the

Figure 5: Jumpers 1 and 2The display can be powered by the USB port or by external power. Soldering Jumper 1, and removingJumper 2 will allow for powe

2.1.4 Alternate USB CommunicationsFigure 6: USB & Alternate USBTable 6: Connector PinoutPin Number Description5 Ground4 Not Used3 D+2 D-1 +5VMatri

2.1.5 Serial TTL CommunicationFigure 7: Rx / Tx LED HeaderThe display can also be talked to at TTL (logic 0V to +5V) levels. This will allow TTL commu

Figure 8: Fan Header2.2.1 Advanced General Purpose Outputs & GPO’s 1 to 4These outputs are capable of controlling high current draw devices, savin

WARNINGS• RPM reading should not be used at 5V• There are no current limiting resistors• Maximum current draw is 1000mA• As of Firmware Revision 1.1,

2.2.3 GPO 5, GPO 6, and GPO 7Figure 11: General Purpose OutputsGPO’s 5, 6, and 7 are low power ouputs providing +5V at 20mA enforced by a current limi

2.4 The Built In Character FontThe display includes a built in 5x8 dot matrix font with the full range of ASCII characters plus a varietyof extended c

2.5 Writing Text to the DisplayWhen the display receives a character, it displays that character at the position currently defined. Thenext character s

2.6.5 Set Cursor Position (254 71 [column][row])This command sets the cursor position (text insertion point) to the [column] and [row] specified. Colum

ContentsContents ii1 Introduction 11.1 What to Expect From the LK204-24-USB . . . . . . . . . . . . . . . . . . . . . . . . . . . 11.2 What Not to Exp

2.6.12 Cursor Right (254 77)Moves the cursor one position to the right but does not erase any character that may be in that position.Note that this co

Table 7: Keypad LayoutColumns1 2 3 4 5 61 A B C D E FRows 2 G H I J K L3 M N O P Q R4 S T U V W XNOTE The keypad connector must be wired with columns

Figure 15: Poll Timing3.3.2 Auto Repeat Mode Off (254 96)(R)This command turns off the auto repeat mode3.3.3 Auto Transmit Keypresses On (254 65)(R)In

3.3.7 Set Debounce Time (254 85 [time])(R)This command sets the time between key press and key read. All key types with the exception of latchedpiezo

4.1.4 Initialize Horizontal Bar Graph (254 104)This command defines the 8 special / user characters to be blocks suitable for use in drawing horizontal

Table 9: Character Values1 2 3 4 56 7 8 9 1011 12 13 14 1516 17 18 19 2021 22 23 24 2526 27 28 29 3031 32 33 34 3536 37 38 39 40NOTE Custom characters

protocol is used for reading fan speeds and retrieving 1-wire bus information. The basic structure of theprotocol is described in the Table below.Tabl

5.2 Fan and GPO Commands5.2.1 General Purpose Output Off (254 86 [gpo #])This command turns OFF any of the general purpose outputs. [gpo #] is 1 to 6.

5.2.5 Remember GPO / PWM State (254 195 [fan #] [PWM value])This command will set the startup state for all the GPOs. When the device is powered up th

Table 15: Example PWM Values for Index = 14Input PWM Actual PWM0 01 -63 25%64 -127 50%128- 191 75%192- 255 100%Frequencies in the range of 9.6Hz to 38

3 Keypad Interface 163.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163.2 Connections . . . . .

1. Reset and detect presence.2. ROM command, followed by any required data exchange.3. Device specific function command, followed by any required data

6.4.1 Transaction command (254 C8 1 [flags] [Send Bits] [Recieve bits][Send data])The transaction command will perform a single transaction on the 1-wi

Table 18: 1-Wire Error CodesCode Description0x00 Success0x01 Unknown 1-Wire command0x02 No devices on the bus0x03 Fatal search error6.4.2 Search comma

7.1.1 Remember (254 147 [0|1])This command allows a number of settings, such as cursor state, backlight, etc., to automatically bestored in non-volati

only changes the value until the next power down.7.1.5 Backlight on (254 66[minutes]) (R)This command turns on the backlight for a time of [minutes] m

Table 22: Default ScreenCharacter 1 Character 20Character 21 Character 40Character 41 Character 60Character 61 Character 80If sending more then 10 cha

7.1.13 Read Version Number (254 54)This command will return a 1 byte hex value.8 Appendix: Command Summary8.1 GeneralThe operation of the LK204-24-USB

Table 24: Hex Value TableBinary Hex Decimal Binary Hex Decimal0000 0 0 1000 8 80001 1 1 1001 9 90010 2 2 1010 A 100011 3 3 1011 B 110100 4 4 1100 C 12

NOTE The letter “R” in the default column indicates that this state can be saved to non-volatile memory with the “Remember” command.Table 26: Text Com

Command Syntax Default NotesBlock cursor off FE 54254 84254 “T”R Turns off theblinking blockcursor.Cursor left FE 4C254 76254 “L”Moves the cur-sor one

7.1.5 Backlight on (254 66[minutes]) (R) . . . . . . . . . . . . . . . . . . . . . . . . . . 307.1.6 Backlight off (254 70) (R) . . . . . . . . . . .

Command Syntax Default NotesAuto transmit key pressesonFE 41254 65254 “A”onRSets auto transmitmode for keypad.Key presses aretransmitted tohost withou

Command Syntax NotesDefine custom character FE 4E [c][8 bytes]254 78 [c][8 bytes]254 “N” [c][8 bytes]Defines one of 8 custom “user” char-acters. Charact

Command Syntax Default NotesRemember GPO / PWMstateFE C2254 195n/a This commandwill set the startup state for all theGPOs.Set PWM base frequency(New i

Command Syntax Default NotesSet contrast and save FE 91 [contrast]254 145 [contrast]0x80128Same as "set con-trast" but saves[contrast] as de

Command Syntax Default NotesSet serial number FE 34 [byte1][byte2]254 52[byte1][byte2]254 “4” [byte1][byte2]This is a one-time-use com-mand whichworks

9 Appendix: Specifications and Options9.1 SpecificationsTable 36: Environmental SpecificationsStandard TemperatureOperating Temperature 0C to +50CStorage

Figure 16: Physical LayoutMatrix Orbital LK204-24-USB 42

9.2 OptionsTable 39: Options Available on the LK204-24-USBInverse Yellow; black backlight with yellow text -IYInverse Blue; blue backlight with white

Configuration The way a system is set up, or the assortment of com-ponents that make up the system. Configuration canrefer to either hardware or softwar

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 LK204-24-USB is equipped with the following features;• 20 column by 4 line text display• Built in font with provision for up to 8 us

1.3 Keypad InterfaceThe keypad interface takes row / column input and converts it it ASCII characters, which are deliveredout the USB port to the asso

1.5 Trying out the LK204-24-USBThe unit should be connected to the USB and the backlight and custom startup screen should come on.• Run a PC program s

2 Connections2.1 Connector PinoutRefer to the Figure below for this chapter.Figure 2: Electrical ConnectionsTable 1: Connectors & FunctionsConnect

Table 2: Mating ConnectorsConnector Part # Mate Part #3 Pin White Header AMP 173979 AMP 1739773 Pin Red Header MOLEX 43009 MOLEX 787910 Pin Dual Heade