SC2004 20x4 Characters Serial LCD Module
Contents
1. 40 Level 254 43 length 254 44 length 254 45 row number 254 46 column number Set outputs OxFE 0x2F output value 254 47 output value Set P2 as GPIO Set P2 as Keypad Inputs OxFE 0x30 Ox FF OxFE 0x30 OxFE 254 48 255 254 48 254 Set cursor position OxFE 0x32 row number column number www siliconcraft net 254 50 row number column num ber 4 27 2010 SILIGCON GRAF 1 SC2004A 20x4 Characters Serial LCD Display User s Manual Command Code Hexadecimal Code Decimal Draw Vertical Graph OxFE 0x33 column number height 254 51 column number height Print stored texts on selected row OxFE 0x34 row number memory 254 52 row number memory loca location tion Print big numbers OxFE 0x63 4 bytes ASCII numbers 254 99 4 bytes ASCII numbers Define Custom Characters OxFE 0x64 64 Bytes Bitmap Data 254 100 64 Bytes ASCII Bitmap Data Defines texts messages OxFE memory location 20 Bytes text 254 memory location 20 bytes text message message 95 0 1 a as ie es a a eae A ne Ho WoW Wo Woo II AS E JL JL Ji gt JDL JIEL JIL AR o a a ei aa a Se AS Se O O Se A O A Hoo n MO N Sa p e S pal ee ee s AAA o a al a a i o ee i iia i TEE ET Hoo oe oT E AE AE AE A eS IE AE l EE L JL JL L Iw ae a Sa a ii A E ae A as Ide ae Ho2. oT WoW om I oUt JE AE HEEE SE aI eee alee Se pa ee E Le ESE AA A emer epee r ie F L r Es F L R250 x 4 Figure 19 Mechanical Dimension units in mm Maximum height 27 mm 10 www siliconcraft net 4 27 2010 SILICON CRAFT SC2004A 20x4 Characters Serial LCD Display User s Manual 125 0 85 0 42 5 111 0 Figure 20 Mounting Kit dimension units in mm Thickness 1 5 mm 11 www siliconcraft net 4 27 2010
3. 4 Row 4 103 Row 3 102 Row 2 101 Row 1 COM o anna 0 5V de a Je GESS Analog E Inputs e us ie 2 i 14 s na E x z o a Bal q N 4 P2 Header 000000000 Y N Fig 5 GPIO Keypad Connector Fig 4 SC2004A Back View O Not Used 5 Not Used Ol TXD TTL O RXD TIL O TXD RS232 E O RXD RS232 O COM Pl Fig 7 Mating Connector for P1 P2 Molex C Grid 0 1 Fig 6 Communication Port DB9 Female Connector Fig 8 Connection to RS232 DB9 Connector Fig 9 Optional Accessories RS232 Cable Communication Communication with SC2004 is through its UART serial port either RS232 or TTL interface 8 data bits no parity 1 stop bit 8 N 1 Baud rate is programmable to 9600 bps or 19200 bps Factory default Displaying texts SC2004A displays whatever characters it receives from the serial port starting from the top left corner Supported internal characters is listed in Table 1 2 www siliconcraft net 4 27 2010 SILICON CRAFT SC2004A 20x4 Characters Serial LCD Display User s Manual S voor wo wi wow ve CG a oom MPO Sop ome HADA a FFOaq Table 1 Supported Characters wwa AEN PREM AA pomo LSI S LIMITES pe so FSD TE DR PL wwo EE a es Ly slo BIPM FAN wmf POW Iw FFF ION woes co S PUES coma AAD TY coun KET 212 LTO F coo FEREK A APE OR ewj ALL E coo SIM Vitae a eS wolo fa LIM aE A wfo APPO RO Contr
4. D Display User s Manual GPIO on P2 IO Mode Each pin can be configured as input or output When configured as input internal pull up resistor is activated When configured as output each IO is capable of sinking or sourcing 20 mA of current at 5V Configure GPIO command O OxFE 0x32 GPIO Direction Each bit in GPIO Direction set the direction of the GPIO where 1 set to output and 0 set to input To control GPIOs set as output use command OxFE Ox2F output 1 to set 0 to clear Bit on GPIO set as input will be ignored 060000000090 0600400009090 MM m LCD will send p7 p7 OxFC 0x00 input Fig 15 Tact Switch Con Fig 16 LED Connection when the input is activated nection Example IO 1 con Example IO 3 configured Switch pressed figured as input as output Keypad Mode Column 1 To set P2 header as keypad input send command Column 2 OxFE 0x30 OxFE Column 3 Keypress Response Code 1 OxFC OxFE OxFF ee 2 OxFC OxEF OxFF 3 OxFC OxFF OxFE A OxFC OxFF OxEF 4 OxFC OxFD OxFF Fig 17 Keypad Connection to P2 5 OxFC OxDF OxFF 6 OxFC OxFF OxFD B OxFC OxFF 0xDF a ia 1 OxFC OxFB OxFF 5 106 Column 2 8 OxFC OxBF OxFF O ear 9 OxFC OxFF OxFB O o C OxFC OxFF OxBF e 101 Row 1 OxFC 0xF7 OxFF E 0 OxFC Ox7F OxFF p2 OxFC OxFF 0xF7 D OxFC OxFF 0x7F 7 www siliconcraft net 4 27 2010 SILIG
5. ON GRAF 1 SC2004A 20x4 Characters Serial LCD Display User s Manual Saving the user s settings onto non volatile Flash Memory User s setting Backlight brightness level e Custom Characters e Texts Messages o P2 Headers Functions Baud rate Can be made permanent so that its retains the user s setting even after the module is powered down To do this send the save settings command after you have entered all your settings OxFE 0x20 When settings is saved the module response with OxFE 0x20 0x20 indicating successful save operation Changing the Baud Rate 9600 bps command OxFE OxlE 19200 bps command OxFE 0x1F Send save settings command Baud rate will only be changed on the next power up cycle SC2004A pp Software This software runs on Windows PC designed to test and configure SC2004 Available for free from www siliconcraft net download htm You can use it to create the custom characters define the stored texts messages and test all the functionality of SC2004 Hexadecimal code of all command sent to the LCD will be displayed along with all the responded code from the LCD Communication Data Monitor HEX Transmitted Bytes Received Bytes Figure 18 Communication Monitor from SC2004App Software Electrical Specification Power Supply 9 to 12VDC Communication Interface RS232 TTL Current consumption 25mA Backlight Off Maximum input voltage at TTL input 5 5V Backlight Off Output Hig
6. SILIGON GRAF 1 SC2004A 20x4 Characters Serial LCD Display User s Manual Fig 1 SC2004A YG SC2004A is an intelligence LCD module design to ease project development that requires a LCD display Its RS232 interface board receives and interpret serial data and output the data to the LCD display accordingly SC2004A works with any host controller with serial UART port SC2004A replaces older version SC2004 Display Option Available 1 SC2004A YG Dark Characters on Yellow Green LED backlight SC2004A Features Features 2 SC2004A B White Characters on Blue LED RS232 or serial TTL interface backlight o Controllable LED backlight brightness 3 SC2004A W Dark Characters on White LED 85 Bytes UART receive buffer eliminates backlight delay requirement between commands Bar graph drawing commands 20 messages storage for easy retrieval each ANKA N N A A A o 20 characters wide eeee Large Numbers Display Function 8 GPIOs individually configurable as input or output 4x4 Keypad Interface 2 Analog Inputs 0 to 5V range 8 User s Define Characters Programmable baud rate 9600 19200 bps 9 to 12VDC Power Supply Fig 2 SC2004A B Fig 3 SC2004A W Fig 4 Optional Aluminum Panel Mounting Plate www siliconcraft net 4 27 2010 SILICON CRAFT SC2004A 20x4 Characters Serial LCD Display User s Manual Connecting SC2004A 108 Column 4 107 Column 3 9 12VDC 106 Column 2 IO5 Column 1 10
7. eously Cursor Control Cursor is the indicator of the current position on the LCD where the character is to be displayed By de fault the cursor is hidden To turn it on send com mand OxFE 0x01 for underline type cursor or OxFE 0x02 for block blinking type of cursor To hide it send command OxFE 0x03 Figure 11 Row and Column Positions Cursor can be moved to any position on the screen by command OxFE 0x32 row number column number Example to move cursor to row 2 column 10 OxFE 0x32 0x02 0x0A Delete row Texts on any row can be cleared by command OxFE 0x2D row number Cursor is moved to the beginning of the selected row after execution of this command Delete column Texts on any row can be cleared by command OxFE 0x2E column number Cursor is moved to the next column at row 3 after execution of this command 4 www siliconcraft net 4 27 2010 SILIGON GRAF 1 SC2004A 20x4 Characters Serial LCD Display User s Manual LED Backlight Control The backlight is turn on by command OxFE 0x06 and turn off by command OxFE 0x07 Brightness is control with command OxFE 0x28 Brightness level Where brightness level 50 min 250 max Backlight is turn on when the module is powered up Texts Messages Storage 20 memory locations is reserved for storage of commonly used messages Each is 20 characters wide Messages can be programmed by user with the command OxFE memory location address 20 bytes texts including spac
8. es Where memory location address is OxC8 200 Decimal for location 0 and OxDB 219 Decimal for location 19 respectively Messages is retrieved and displayed with command OxFE 0x34 row number where text to be displayed memory location address 0 to 19 Big Numbers SC2004 is capable of drawing 4 big numbers each spanning 4 rows by 4 columns Initialize big numbers command must be issued before this command can be used OxFE 0x08 Draw big numbers command is OxFE 0x63 4 digits ASCII numbers Supported numbers are 0 to 9 and space 0x20 To draw numbers 2004 on the screen First clear the LCD Initialized big number OxFE 0x08 Send OxFE 0x63 0x32 0x30 0x30 0x34 Figure 12 Draw Big Numbers Example Analog Ports 0 5VDC AN Fig 13 Analog Ports Inputs gt COM Analog 1 amp 2 measure voltage of O to 5V Read Analog 1 Command OxFE 0x0B Response OxFA ADC Value MSB ADC Value LSB Read Analog 2 Command OxFE 0x0C Response OxFB ADC Value MSB ADC Value LSB ADC value is 1024 if input is 5V 5 www siliconcraft net 4 27 2010 SILIGON GRAF 1 SC2004A 20x4 Characters Serial LCD Display User s Manual Bar Graph Graph can be drawn from left to right or right to left The starting point of the graph is the current cursor position Initialize horizontal graph command OxFE 0x04 must be issued before this command can be used In the example in Figure 15 the star
9. h Voltage Level SV SC2004A YG Max 300mA Min 150mA Maximum sink source current at output pin 20mA SC2004A B W Max 50mA Min 30mA Operating Temperature 0 C to 50 C Storage Temperature 10 C to 60 C LCD Data Viewing Direction 6 o clock Character size 2 95 x 4 75 mm Dot Size 0 55 x 0 55 mm Dot pitch 0 60 x 0 60 mm 8 www siliconcraft net 4 27 2010 SC2004A 20x4 Characters Serial LCD Display User s Manual Command Summary Command Code Hexadecimal Code Decimal Cursor Home Ox0B 11 Move cursor to the beginning of the next Ox0C 12 row Clear LCD Ox0D 13 Cursor On Underline OxFE 0x01 254 1 Cursor On Blinking OxFE 0x02 254 2 Cursor Off OxFE 0x03 254 3 Initialize horizontal graph OxFE 0x04 254 4 Initialize vertical graph OxFE 0x05 254 5 Backlight On OxFE 0x06 254 6 Backlight Off OxFE 0x07 254 7 Initialize Custom Characters OxFE 0x08 254 8 Initialize Big Numbers OxFE 0x09 254 9 Read Analog 1 Value OxFE Ox0A 254 10 Read Analog 2 Value OxFE O0x0B 254 11 Set baud rate to 9600 bps OxFE 0x1E 254 30 Set baud rate to 19200 bps OxFE Ox1F 254 31 Save settings OxFE 0x20 254 32 Set Backlight Brightness Draw horizontal graph left to right Draw horizontal graph right to left Clear selected row Clear selected column OxFE 0x28 Level OxFE 0x2B length OxFE 0x2C length OxFE 0x2D row number OxFE 0x2E column number 254
10. ol Characters Ox08 Backspace Move cursor one position left and delete the character OxOB Cursor Home Send cursor to top left corner LCD screen unchanged Ox0C Next Line Move cursor to the beginning of the next line Ox0D Clear Screen Clear LCD screen and send cursor home Ox0E Cursor Left Move cursor one position to the left OxOF Cursor Right Move cursor one position to the right Text Display Example To display LCD Demonstration 4 2 2 Send LCD Demonstration OxOC 0x34 0x20 OxXFD 0x20 0x32 0x3D 0x32 Total 25 Bytes 3 www siliconcraft net 4 27 2010 SILIGON GRAF 1 SC2004A 20x4 Characters Serial LCD Display User s Manual User s Defined Characters Apart from the character set listed in Figure 11 8 memory spaces are reserved for user s defined characters Each custom character is 5 x 8 pixels matrix represented by 8 bytes of data munan Figure 10 Example of a Custom Character Custom character above is represented by 0x04 0x06 0x07 0x04 0x04 0x04 0x04 Ox 1F Custom characters can be defined by sending command OxFE 0x64 8 Bytes x 8 Bytes Custom Characters Bitmap Before these custom characters can be displayed it must be loaded to the LCD memory This is done by command OxFE 0x08 Send 0x00 through 0x07 to display custom character O to 7 respectively Note Graph drawing command shares the same bitmap memory with custom characters on the LCD Thus both cannot be used simultan
11. ting point of the graph is at column 10 Figure 13 Horizontal Bar Graph To draw the graph at row 0 first set the cursor to row 0 column 10 Then issue the draw left to right graph com mand OxFE Ox2B length of the graph in this case 26 The maximum length of the graph depends on the starting position of the graph In the example above maximum length is 50 If a new graph is drawn over the existing graph the existing graph will not be automatically override This is OK if the new graph length is greater than the existing one However if the new graph is shorter in length the graph must be erase first before a new graph is drawn Ensure that cursor position is set to the beginning of the graph first Uertical Gr E Vertical bar graph can be drawn in any column with row 3 as be ori A a ar arr bottom of the graph Maximum height is 32 Demonstration Before the vertical graph command can be used initialize vertical graph command must be issued OxFE 0x05 Vertical graph 1s draw by command OxFE 0x33 column number height Unlike horizontal graph drawing a new graph over the exist ing one will automatically erase the existing graph first Figure 14 Vertical Bar Graph Note Custom Characters Horizontal graph Vertical Graph and Big Numbers shares the same characters set Thus only one of them can be used at any one time 6 www siliconcraft net 4 27 2010 SILIGON GRAF 1 SC2004A 20x4 Characters Serial LC
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