07557622-data sheet display
Contents
1. Protective plate Fitting plate LCM Recipes and Example Programs The G12032 accepts standard RS 232 style serial so it can be used with hundreds of different computers and dozens of combinations of programming language and operating system So it s a lost cause to try to present a comprehensive set of example programs This disk contains examples in several dialects of BASIC Additional examples will be posted at www seetron com as they become available As a headstart we recommend that you use a terminal program to try some of the recipes techniques for achieving particular effects by manually typing instructions and data Once you understand the recipes you can translate them into the programming language of your choice Type the recipes exactly as shown don t add spaces or returns unless you see space or return For control characters like ctrl L hold down the control key and press another key L in this case For Escape codes press and release Esc then type the other characters specified Recipe 1 Positioning the Cursor This recipe shows how to position the cursor to print changing data without reprinting the entire screen Note the 0 in the esc C and F instructions are zeros not the letter O Type this Purpose effect Speed rata pooo http www seetron com sgxmnl htm 2002 11 13 SGX 120L User Manual rev2 0 cntl P p 99 mph shortcut for 48 is 64 48 112 p is ASCII 112 Page 20 of 21 Note th2. that terminates position mode is ignored One byte binary method Send the display position as a single byte value equal to the position plus 64 For example from a terminal program press control P then type A The cursor will jump to position 1 second character of the first line because the ASCII code for A is 65 The G12032 subtracts 64 from the binary value to arrive at the screen position With either method the G12032 will accept values larger than the highest valid screen position for the current font The cursor will simply wrap around until it reaches a valid screen position As with all instructions that move the printing position ctrl P works in terms of the font size in effect at the time If you have a mixture of font sizes on the screen keep this in mind See the description of the font instruction for further information on screen layouts with various font sizes Ignored ASCII 17 Control Q Control Q is ignored but takes space in the buffer Use control if you need a time delay Right Align ASCII 18 Control R Control R accepts a number from 2 to 9 as text representing the width of an area on the screen in which right aligned text is to be printed The printing position will back up by that number of characters from its present position Subsequent text will be stored without printing until one of the following is received e The specified number of characters e Acontrol character ASCII 1 31 e A decimal point th
3. 2 16 The font instruction ESC F described later can instruct the display to fetch character bitmaps from higher EEPROM pages For example pages 0 and 1 could hold the normal text font while pages 2 and 3 held a set of special symbols http Awww seetron com sgxmnl htm 2002 11 13 SGX 120L User Manual rev2 0 Page 9 of 21 Graphics Instructions Escape Sequences The table below lists the graphics instructions These are called escape sequences because they begin with the escape character ASCII 27 which distinguishes them from normal text All escape sequences follow the same basic pattern escape letter number For example the escape sequence for displaying a screen stored in EEPROM is ESC E n where n is a number from 0 to 16 From the keyboard you would press the Escape key then E then a number key like 2 then a non numeric key like the space bar As soon as you press the space bar EEPROM screen 2 would load into the display The final non number character in the sequence the space in our example is thrown away it does not affect the display except to signal the end of the number Some escape sequences take more than one number You can use any non numeric character other than null ASCII 0 to separate the numbers As we saw in the previous example the last number must be followed by a non numeric throwaway character Numeric entries are always sent as decimal text like 123 or one byte shortcuts Numbers up to 191 may be
4. accidental reconfiguration of the startup data 2400 9600 Set the serial data rate to 2400 or 9600 bps The serial parameters are no parity 8 data bits 1 stop bit http Awww seetron com sgxmnl htm 2002 11 13 SGX 120L User Manual rev2 0 BPS up 9600 down 2400 5V GND Serial In a ai See HEHE hORBEECE Page 3 of 21 s x vce AB Oy nI EN a EEAO wm E 88 a k pisces 20 30 e EEES e 5 tt A ken bRRLELE LEER ER 4 perk ay vere a TE re am ar TEA Oe e Per wea y Hio s r iT gt A kon hj i 9V CONTRAST GND A Do not connect power to J1 and 9V up SET SLIDE SHOW SEINE TING down RUN SERIAL IN A Ensure correct polarity MO DE Figure 1 G12032 connections and configuration switches Connecting Power The G12032 has a built in voltage regulator The input is a two pin connector marked 9V since a 9V battery is a suitable power source With the supplied 9V battery snap the red wire goes to the pin You also use an adapter or other power supply whose output is 7 to 10Vdc You may also connect regulated 5VDC power directly to the pins of J1 the 5 pin connector The appropriate pins are marked 5V and GND Make sure that your power supply is regulated to 5VDC 0 25V and is capable of supplying up to 75 mA A Power Supply Cautions http www seetron com sgxmnl htm Do not reverse 5V and GND when supplying 5VDC through J1 These connections are protected by a shunt diode on the
5. circuit board A reversed connection will look like a short circuit to your power supply and may damage it A sufficiently powerful supply connected backwards may destroy the diode and the display Do not exceed 5 5VDC into the 5V input Overvoltage may damage the display and or your power source Do not connect anything to 9V J1 pin 2 when supplying 5VDC through J1 pin 3 Do not tap into the display s 5 volt supply to power other devices When the backlight is turned on the regulator is near its maximum continuous current rating 2002 11 13 SGX 120L User Manual rev2 0 Page 4 of 21 Connecting Serial Input The G12032 accepts serial data from RS 232 10 volt or logic level 5 volt sources Although most serial ports implement additional pins for handshaking purposes the G12032 requires only the transmit data TxD and signal ground SG lines Connect these to SER and GND respectively The figure below shows typical hookups for standard PC style serial ports and BASIC Stamp computers PC Serial comm Port BASIC Stamps DB 9 female G12032 Stamp G12032 solder side GND Vss GND 5V Vdd 5 VO pin0 gt gt SER loopback connections see text Figure 2 Connecting serial input The loopback connections shown in the PC comm port hookup serve to disable hardware handshaking Our BASIC example programs do not require these connections but many terminal programs do If the s
6. escape sequence descriptions Set byte write A ddress ESC A x y Set the address for the next byte write instruction ESC B n The x coordinate can range from 0 to 119 y from 0 to 3 Write a B yte Bit Pattern ESC B n Write the byte value represented by n 0 255 to the current screen address set by the instruction ESC A x y Bytes are treated as vertical columns of bits with the low bit Isb at the top Bits that are set to 1 show as black pixels Os as white After this instruction the write byte address is automatically incremented by 1 If your program requires writing bytes to sequential screen locations left to right and top to bottom you need only to set the starting address D ownload a Graphic ESC D G Download a bitmapped graphic to the screen Note that the G in the command is literal send a capital letter G ASCII 71 in this position After this instruction a program should pause without sending any further data for 200ms or more This instruction takes binary data so it temporarily suspends the G12032 s usual behavior of discarding nulls ASCII 0 A total of 480 bytes make up a graphic screen These bytes map to the screen in exactly the same fashion as those sent via the write byte instruction working left to right and top to bottom See the Painless Graphics Primer for a map of the graphics screen The G12032 starter package includes simple utilities for converting and downloading BMP files Sho
7. sent as one byte shortcuts Just add 64 to the number and send that single byte value For example to send the number 101 you could either send the three bytes 101 or a single byte containing the value 64 101 165 i e A5 hex 10100101 binary When you send multiple numbers as shortcuts you do not need any characters to separate them nor any throwaway character s Sequence Purpose Effect ESC Axy Set screen address for next ESC B n to x y Write bit pattern n to current screen address Screen address is incremented by 1 ESC Bn i after write ESC D G Download a 480 byte bitmap graphic Display EEPROM screen n 0 16 NOTE Earlier models firmware version 24 and i below were limited to screens 0 7 Set the font size and EEPROM page according to n EEPROM Pages 0 default pages 0 amp 1 Sizes 4 pages 2 amp 3 0 normal font 6x8 pixels 8 pages 4 amp 5 1 wide 12x8 pixels 12 pages 6 amp 7 ESC Fn 2 tall 6x16 pixels 16 pages 8 amp 9 3 widettall 12x16 pixels 20 pages 10 amp 11 24 pages 12 amp 13 28 pages 14 amp 15 Options can be combined by adding the values above together Note that earlier models firmware 24 and below were limited to EEPROM pages 0 7 ESC In Set the ink for points and lines to n where 0 is white and 1 is black ESC L x1 y1 x2 y2 Plot a line from coordinates x1 y1 to x2 y2 ESC Mn Set the graphics drawing mode a
8. the time the instruction is received For example if a program sends ctrl P 9 to move to position 9 it will move to the end of the first line if the wide or large font size is in effect or the middle of the first line if small or tall fonts are in effect The bitmaps pictures of the individual characters that make up the font are nothing more than a pair of ordinary 120x32 pixel graphics By default the G12032 looks at EEPROM pages 0 and 1 as the font Figure 3 shows how the display maps portions of those graphics to the printable characters ASCII values of 32 to 191 If you need more than 160 characters you can store the additional bitmaps on the other EEPROM pages and instruct the G12032 to get characters from those locations Bits 2 and 3 of n set the font page as follows http Awww seetron com sgxmni htm 2002 11 13 SGX 120L User Manual rev2 0 Page 12 of 21 Font Location Valueorn EEPROM pages 0 0 and 1 4 2 and 3 8 4 and 5 12 6 and 7 16 8 and 9 20 10 and 11 24 12 and 13 28 14 and 15 To determine the value of n required for a given size and source page just add the values in the preceding two tables together For example if you want the G12032 to use characters from EEPROM pages 4 and 5 n 8 in the tall format n 2 send ESC F 10 To use the normal page 0 1 font n 0 in the small size send ESC F 0 Note that the default font size the size the G12032 will use after power up and before receiving any ESC F instructions
9. 2002 11 13 ELFA PRODUKTINFORMATION Vi reserverar oss mot fel samt f rbeh ller oss r tten till ndringar utan f reg ende meddelande ELFA artikelnr 75 576 22 Grafisk LCD Seriell 120x32 SGX 120L User Manual rev2 0 Page 1 of 21 120x32 pixel Serial LCD Graphics Module G12032 updated Sept 26 2000 The G12032 Serial LCD Graphics Module receives data serially at 2400 or 9600 bits per second bps and displays text and graphics on a 120 by 32 pixel screen The G12032 supports four font sizes small wide tall and large Depending on the font size selected the screen can be formatted as e 4 lines by 20 characters e 4lines by 10 characters e 2 lines by 20 characters e 2 lines by 10 characters Common terminal printer control codes such as linefeeds carriage returns tabs backspace formfeeds are supported for easy formatting Additional instructions permit backlight control font selection and cursor positioning Graphics instructions plot points draw lines and display full screen images from nonvolatile memory The G12032 firmware version 030 or higher has 8kB of nonvolatile EEPROM memory divided into 17 pages of 480 bytes each The lower two pages of this memory hold the default text font used to display text The remaining memory can be used to store up to 15 full screen images or additional fonts A utility program allows you to convert and download bitmapped pictures 120x32 pixel BMP graphics to the displ
10. accessory e Pull down the Image menu and select Attributes e Type in a Width of 120 and Height of 32 e Under Units click on Pels e Under Colors click on Black and white When you re done click OK The Paint accessory is a good choice for creating and editing these images because it lets you work pixel by pixel and can display a grid and or xy coordinates You can import pictures from most other programs via cut and paste The disk that comes with the starter kit contains the standard font and a set of sample images An easy way to get started is to open one of these files with Paint modify it and save it under a different file name Don t use any other format or settings The utility will download gibberish to the display as it cannot recognize or convert other formats Check the file size it will be always be 574 bytes for a 120x32 uncompressed black and white BMP file Hint If you used an upscale graphics program e g Photoshop to create the file and the file size is slightly off you can correct this by opening the file with Paint and resaving it as a standard BMP file Using the Downloading Program The conversion downloading program is a simple program that runs under any recent version of Windows 95 or later You will find several versions of it on the G12032 disk named BMP2COM1 BMP2COM2 etc The program name indicates the com port that will be used for downloading BMP2COM2 uses com 2 Copy the program matching th
11. ange to hieroglyphics You will have to restore the fonts from the included starter disk Note The G12032 s EEPROM can be rewritten at least 1 million times and read an unlimited number of times Painless Graphics Primer Here is a quick rundown on the operating principles of the display Digital Ink The LCD is a visible piece of memory Each pixel is a bit in memory The color of a pixel is controlled by the state of the corresponding bit 0 white 1 black Coordinate System Memory starts at the upper lefthand corner of the display with memory address 0 Byte addresses are numbered sequentially from 0 to 479 left to right and top to bottom The figure below shows how rows of bytes in address order correspond to four horizontal stripes of 120 bytes apiece The magnified portion of the drawing shows the byte located at xy coordinate 0 0 In keeping with mathematical tradition x is the horizontal coordinate and y is the vertical That byte contains 10011111 binary or 159 decimal 120 bytes per row gt 0 119 ixel 119 31 i N Figure 5 Screen Layout The other way to look at the screen is as individual pixels The only difference from the byte point of view is the vertical y coordinate ranges from 0 31 instead of 0 3 In other words the screen coordinates for individual pixels ranges from 0 0 at the upper left corner to 119 31 at the lower right The ESC V instruction allows you to flip the vertical co
12. at you can send positions as either number strings like 28 followed by a throwaway character like Space or as a single byte The byte value is the number 64 In the example 28 is represented by a byte value of 92 which is the ASCII code for In a program you d send a byte value as a byte an unsigned char in C or a CHR in BASIC Recipe 2 Displaying an EEPROM Screen This recipe shows how to display an image stored in EEPROM and flash the image between normal and reversed modes It assumes that the factory installed screens are still stored in memory If they are not the images displayed will vary from the description Type this Purpose effect entl L Clear screen esc E 2 space Show EEPROM image 2 G12032 title screen esc E 3 space Show EEPROM image 3 Intruder Alert esc R 15 space Reverse invert the whole screen lesc R 0 space Un reverse the whole screen Recipe 3 Combining Font Sizes This recipe shows how different fonts can be displayed on the same screen Note that the font size is set before the screen address input Type this Purpose effect Recipe 4 Selective Highlighting This recipe shows how to use esc R to selectively highlight lines of text http Awww seetron com sgxmni htm 2002 11 13 SGX 120L User Manual rev2 0 Page 21 of 21 Type this Purpose effect c
13. ay G12864 Compatibility The G12032 is very similar to the larger G12864 but there are some inevitable differences If you are familiar with the G12864 check the comparison table in the specifications section of this document Table of Contents e Description Disclaimer of Liability Warranty Return Repair Replacement Policy Contacting the Manufacturer Quick Checkout and Demonstration Configuring the G12032 Connecting Power Connecting Serial Input Display Contrast Getting Acquainted Text Control Codes Graphics Instructions Painless Graphics Primer Creating and Downloading Bitmap Fonts and Graphics Design Notes and Specifications Recipes and Example Programs Disclaimer of Liability Scott Edwards Electronics Inc is not responsible for any special incidental or consequential damages resulting from any breach of warranty or under any legal theory including lost profits downtime goodwill damage to or replacement of equipment or property and any costs or recovering reprogramming or reproducing of data associated with the use of the hardware or software described herein Warranty Return Repair Replacement Policy Scott Edwards Electronics Inc warrants this product against defects in materials and workmanship for a http Awww seetron com sgxmni htm 2002 11 13 SGX 120L User Manual rev2 0 Page 2 of 21 period of 90 days If you discover a defect we will at our o
14. cal 6x8 8x16 Multiple font sizes YES NO Multiple font pages YES NO Text cursor NO YES Built in DB9 serial connector NO YES Right alignment instruction YES NO Configuration switch to flip screen vertically NO YES Serial output NO YES Masked reverse instruction to invert selected ines k YES No Y coordinate flip to place origin at bottom or top of screen Unregulated power input mee R RR NOTE The G12864 has a minor bug regarding proper termination of decimal numbers The G12864 is supposed to discard the throwaway character that follows a decimal number However it does not discard ESC This means that programs that don t terminate numbers properly but do send a series of ESC instructions will work when they shouldn t the ESC from the next instruction terminates the previous number and begins a new instruction The G12032 works exactly as described and won t let you get away with improperly terminated numbers If you port code from the G12864 to the G12032 be on the lookout for this difference http Awww seetron com sgxmnl htm 2002 11 13 SGX 120L User Manual rev2 0 Page 17 of 21 Maximum Ratings and Electrical Characteristics The following data is preliminary and subject to change without notice The G12032 consists of two subassemblies an LCD graphics module and a custom serial controller Where the ratings of these two devices vary the more conservative rating
15. can be set using the write configuration instruction ESC W described below Set I nk Color ESC I n Set the color of pixels used in subsequent plot and line instructions to n where 0 is white and 1 is black Draw L ine ESC L x1 y1 x2 y2 Draw a line from the coordinates x1 y1 to x2 y2 in the current ink color and drawing mode Valid x coordinates range from 0 119 and y coordinates 0 31 Drawing lines takes a relatively long time several milliseconds because the G12032 must not only calculate which pixels to set or clear but must also read modify and write many bytes of memory in accordance with the logic of the drawing mode Note Drawing a line can take as long as 6 milliseconds Programs that continuously send line and line to instructions at 9600 bps may overflow the serial input buffer If this happens modify the program with one or two nulls ASCII Os after the line instructions This will give the G12032 time to process the instructions Set Graphics M ode ESC M n Set the logic used to combine new black pixels with old in subsequent plot and line instructions to n where 0 is OR and 1 is XOR Note that this logic is only used in plotting black pixels If the ink is set to white the G12032 unconditionally uses white pixels To understand why the mode only applies to black pixels represented by logic 1s remember that ORing and XORing a 0 with another bit leaves that bit unchanged See the Painless Graphics Primer for more i
16. ccording to the value of n 0 OR 1 XOR ESC Pxy Plot a point pixel at location x y Selectively reverse invert 8 pixel high lines of the display according to the value of n 0 undo inverted lines 1 line 1 inverted BESEGRA 2 line 2 inverted 4 line 3 inverted 8 line 4 inverted Multiple lines can be inverted by adding the values above together ESC T xy Plot a line from last line end to x y http www seetron com sgxmnl htm 2002 11 13 SGX 120L User Manual rev2 0 Page 10 of 21 Set vertical origin y axis 0 point for plots and lines according to n O top of screen ESC Vn _ 1 bottom of screen Write configuration data to EEPROM Works only with switch in SET position Sets startup options according to the value of n 1 backlight on 2 show screen 2 at start ESC Wn 4 write protect EEPROM 8 set font wide 16 set font tall 32 set vertical origin plot line to bottom Options can be combined by adding the values above together ESC Xn Transfer an image from the screen to EEPROM page 0 16 NOTE Earlier models firmware version 24 and below were limited to screens 0 7 If you have some experience with bitmapped graphics you should find the instruction summary reasonably easy to understand The startup default settings allow you to get visible results immediately If you are unfamiliar with terms like xy coordinates XOR etc see the Painless Graphics Primer that follows the detailed
17. d down Ctrl and press L To send control codes from a program transmit a byte containing the appropriate ASCII value For example ctrl L the clear screen instruction has an ASCII value of 12 see table A program would send a byte value of 12 OC hex or 00001100 binary to clear the screen TRA Control Code ASCII Name G12032 Function 0 ctrl NUL Null ignored prior to buffer 1 ctrl A SOH Send cursor home position 0 upper left corner 2 ctrl B STX Begin inverse text white on black printing 3 ctrl C ETX End inverse text 4 ctrl D ETO Ignored 5 ctrl E ENQ Ignored 6 ctrl F ACK Ignored 7 ctrl G BEL Ignored 8 ctrl H BS Backspace 9 ctrl I HTAB Tab to next multiple of 4 column 10 ctrl J LF Smart linefeed move down one row 11 ctrl K VTAB Vertical tab move up one row 12 ctri L FF Formfeed clear the screen 13 ctrl M CR Carriage return move to beginning of next line 14 ctrl N SO Turn backlight on 15 ctrl O Sl Turn backlight off 16 ctrl P DLE Accept cursor position data 17 ctrl Q DC1 Ignored 18 ctrl R DC2 Accept right alignment data 19 26 All ignored 27 ctrl ESC Escape begin graphics instruction NOTE The font size instruction ESC F is described in the graphics portion of this manual Null ASCII 0 C
18. e com port you wish to use to your hard drive Set the G12032 for 9600 bps and connect it to the com port Drag and drop a 120x32 pixel monochrome BMP file onto the BMP2COM program icon The program will convert the bitmap file to the correct format for the G12032 then download it to the display The program will then ask whether you want to transfer the picture to EEPROM and if so to which location 0 16 If you select 0 or 1 the program will verify that you really want to overwrite the font memory The display will not transfer a picture to EEPROM if the display has been configured for write protection via the ESC W instruction The G12032 is shipped with write protection off to allow users to download their own graphics However you probably should turn write protection on before writing and debugging programs that send data to the G12032 An out of control program could instruct the G12032 to overwrite its font s or other graphics making it necessary to reload the EEPROM to restore normal operation Write protecting the EEPROM ensures that stored pictures and fonts remain intact regardless of your program s behavior NOTE Other more elaborate conversion downloading programs are available from our web site www seetron com http Awww seetron com sgxmnI htm 2002 11 13 SGX 120L User Manual rev2 0 Page 16 of 21 Font Structure The text font is stored in the same format as normal full screen images It consists of two screens sto
19. e period character When one of the conditions listed above is met the display will print the stored text with right alignment erasing any leftover text within the specified width Note that all of the print positioning will be done in terms of the font size setting in effect at the time the instruction is received Note Right alignment requires the G12032 to edit incoming data Bytes sent immediately after exiting the right alignment mode may be lost To prevent this make sure that your program delays 3 4 milliseconds after a right alignment before sending any more data Or you can add 3 null characters after the character that ends the right alignment mode see list above The nulls have no effect other than to delay the arrival of subsequent data Ignored ASCII 19 26 control chars ASCII codes 19 through 26 are ignored but do take space in the buffer Use control null if you need a time delay Graphics Prefix ASCII 27 Control ESC Escape tells the G12032 to expect one of the graphics instructions described in the next section http www seetron com sgxmnl htm 2002 11 13 SGX 120L User Manual rev2 0 Page 8 of 21 Printable Characters ASCII 32 191 The G12032 comes with a standard alphanumeric character set font loaded into EEPROM screens 0 and 1 In the demo slide show switch in SET position the first two screens show the characters that make up the text font see figure 3 The utilities disk also contains the
20. font screens in bitmap BMP form that you may edit and download to the display Just remember that editing these characters changes what appears as text If you edit the A so that it looks like Z and download this altered font you ll get Z whenever you send A to the display It s best to confine your changes to the high ASCIl characters 128 191 and leave the normal alphanumeric characters alone Screen 0 bitmapped font for characters 32 111 eT Sigbederahi Jk lane 119 31 Add row and column values to get ASCII code Example capital A ts in column 13 row 52 so the ASCII code is 65 Screen coordinates Columns are x coordinates rows are y coordinates In G12032 instructions and the Windows Paint program coordinates are in the form x y Example the upper left corner of A is at 78 8 Screen 1 bitmapped font for characters 112 191 ASCII character codes Add row and column values to get ASCII code Example x ts in column 8 row 112 so the ASCII code is 120 Screen coordinates Columns are x coordinates rows are y coordinates In G12032 instructions and the Windows Paint program coordinates are in the form x y Example the upper left corner of A is at 78 8 Figure 3 Default character set stored in screens 0 and 1 If you require more than one font pattern or you want to define sets of of symbols to be used in the same way as the fonts consider placing them in the other EEPROM pages
21. high with a tall 16 pixel font there are 2 lines Clear Screen ASCII 12 Control L Control L clears the entire screen and moves the cursor to position O upper left corner of the display Return ASCII 13 Control M Return Key Return which may also be sent as control M sends the cursor to the first column of the next line of the http Awww seetron com sgxmni htm 2002 11 13 SGX 120L User Manual rev2 0 Page 7 of 21 display If return is immediately followed by a linefeed the linefeed will be ignored When a short 8 pixel font is in effect the display is 4 lines high with a tall 16 pixel font there are 2 lines Backlight On ASCII 14 Control N Control N turns on the LED backlight if installed If not control N is ignored Backlight Off ASCII 15 Control O Control O turns off the LED backlight if installed If not control O is ignored Position Cursor ASCII 16 Control P Control P puts the display into cursor positioning mode In this mode there are two ways to move the cursor to a particular position on the screen Text method Send the display position as text For example from a terminal program press control P then type 13 just the numbers not the quotes followed by a space to exit the mode As soon as the space is typed the cursor will jump to position 13 14th character of the first line when the default small font is in effect Note that the space or other non numeric character other than null
22. ime that it is received For example if the large font is in effect a backspace will erase an area the size of one large font character 12 by 16 pixels When fonts of different sizes are mixed on the screen backspace should be used with caution since a large backspace would erase several smaller characters Horizontal Tab ASCII 9 Control I Tab Key Tab which may also be sent as control l causes the cursor to jump to the next multiple of four column position without otherwise affecting the display For example if the cursor is at position 0 sending TAB moves it to position 4 Tabs wrap to the next line or from the last line back to the first line When a narrow 6 pixel font is in effect there are 5 tab stops per line with a wide 12 pixel font there are 3 tab stops per line Smart Linefeed ASCII 10 Control J Control J causes the cursor to drop down to the same column of the next display line If the cursor is on the last line it will wrap to the first line The linefeed function is smart because it ignores redundant linefeeds sent immediately after a carriage return When a short 8 pixel font is in effect the display is 4 lines high with a tall 16 pixel font there are 2 lines Vertical Tab ASCII 11 Control K Control K causes the cursor to move up to the same column of the preceding display line If the cursor is on the first line it will wrap to the last line When a short 8 pixel font is in effect the display is 4 lines
23. is shown in the table Parameter min max typical unit Operating temperature range 0 50 C 32 122 F Storage temperature range 20 70 C 4 158 F Supply voltage to J2 9VDC 7 o 120 9 0 Vdc Supply voltage to J1 5V 4 50 5 50 5 00 Vdc Current draw backlight off 20 10 mA Current draw backlight on 60 40 mA Input voltage serial 1 15 0 5 V Input voltage serial O 3 15 V Processor clock speed 16 MHz Note Current draw specs apply to the 5V supply Current drawn through the 9V connector is approximately 10mA higher Maximum Execution Times for LCD Instructions The following data is preliminary and subject to change without notice Instructions not listed in this table take less than 1 ms and therefore do not cause data to accumulate in the serial input buffer The buffer can hold a maximum of 64 bytes All times are measured from entry of the last instruction parameter to the processing of the next instruction Instruction action Display a text character ASCII 32 191 Clear screen ctrl L EEPROM screen ESC E Line plot ESC L or ESC T Transfer a screen to EEPROM ESC X http Awww seetron com sgxmni htm 2002 11 13 SGX 120L User Manual rev2 0 Page 18 of 21 y offset edge to hole center top amp bottom 4 00 y character size small fo
24. lue of 0 zero for n undoes any previous ESC R inversion Draw Line T o ESC T x y Draw a line from the last end coordinate specified in a line or line to command to point x y in the current ink color and drawing mode Valid x coordinates range from 0 119 and y coordinates 0 31 Note Drawing a line can take as long as 6 milliseconds Programs that continuously send line and line to instructions at 9600 bps may overflow the serial input buffer If this happens modify the program with one or two nulls ASCII Os after the line instructions This will give the G12032 time to process the instructions Change V ertical Origin ESC V n Set the vertical origin the 0 coordinate of the y axis for plotting and line drawing to either the top default or bottom of the screen The number n sets the vertical origin as follows e 0 top e 1 bottom ESC V affects only line and plot operations ESC L ESC T ESC P Points and lines already on the screen are not affected ESC V also does not affect byte oriented operations ESC A and ESC B The factory default configuration is 0 top but ESC W write configuration to EEPROM can change this setting W rite Configuration to EEPROM ESC W n Write configuration settings represented by n to EEPROM to control certain startup options defaults This instruction works only when the SET RUN switch is in the SET position The number n sets options as follows Configuration value or Startup Opti
25. nformation on mode Mode does not affect the way that text is printed text always overprints erases and replaces any previously printed text or graphics If you want to mix text and graphics in the same screen location for example to draw a line through a word on the screen print the text first then apply the graphic P lot a Point ESC P x y Plots a point at location x y using the current setting of ink and mode Valid x coordinates range from 0 119 and y coordinates 0 31 R everse Lines ESC R n Reverse invert change black to white and white to black selected 8 pixel high lines of the display The display is 32 pixels tall so it can be broken into four 8 pixel high lines The number used with ESC R determines which of those bands should be inverted as follows http www seetron com sgxmnl htm 2002 11 13 SGX 120L User Manual rev2 0 Page 13 of 21 Value of n Line to Invert 0 none 1 1 2 2 4 3 8 4 By adding the values above you can invert multiple lines for instance ESC R 12 inverts lines 3 and 4 Note that the G12032 keeps track of which lines were inverted using this command so that subsequent commands can undo previous inversions For example suppose you invert line 1 by sending ESC R 1 To invert line 2 and un invert line 1 just send ESC R 2 The instruction works this way in order to make it easy to selectively highlight lines of text for menu selection applications See the recipes for an example Using a va
26. nt 3 92 x character size small font 2 94 x offset pcb edge to hole center top 4 00 e All dimensions in millimeters e Tolerance is 0 50mm e Maximum depth front of screen to highest point on pcb is 30mm N Aa B e p E E F Fe e1 e2 CEE m 2 k e Handling and Using Liquid Crystal Display Modules LCDs can be damaged by careless handling The manufacturer offers these suggestions for safe handling of LCDs The LCD module and serial interface electronics use CMOS components and should be handled with appropriate antistatic precautions Do not subject the LCD to temperatures outside its storage operating ranges Excessive heat or cold can degrade the polarizer cause bubbles in the LCD material or cause the polarizer to peel Do not touch push or rub the exposed polarizers transparent screens with anything harder than an HB pencil lead glass tweezers etc Hard pressure on the screen may distort the liquid crystal material In some cases the LCD will return to normal with time Do not use glue epoxy silicone sealant paint etc anywhere on the LCD These contain solvents or corrosive substances that degrade contact surfaces over time They can penetrate the LCD and damage elastomeric connectors and optical coatings When the display surface becomes dusty wipe gently with absorbent cotton or other soft material like chamois soaked in petroleum ben
27. ntl L Clear screen esc F 0 space Set 4x20 font Ispace MENU ITEM 1 return Text Ispace MENU ITEM 2 return _ Text Ispace MENU ITEM 3 return Text Ispace MENU ITEM 4 return Text llesc R 1 space Highlight reverse the first line les R 2 space Highlight reverse the second line esc R 4 space Highlight reverse the third line llesc R 8 space Highlight reverse the fourth line Recipe 5 Drawing a Box This recipe shows how to use the line and line to instructions Type this Purpose effect ent L Clear screen llesc L 5 2 114 2 space Draw a line from xy coords 5 2 to 114 2 llesc T 114 27 space Draw a line to xy coords 114 27 esc T 5 27 space Draw a line to xy coords 1 27 llesc T 5 2 space Draw a line to xy coords 5 2 completes box That example has you enter the coordinates as number strings followed by a throwaway character Space You can also send data as a one byte shortcut by adding 64 to the desired coordinate The byte value is the number 64 In the following example 10 is represented by a byte value of 74 which is the ASCII code for J In a program you d send a byte value as a byte an unsigned char in C or a CHR in BASIC Any number up to 191 can be sent as a one byte shortcut Here s an example that use
28. o parity 8 data bits 1 stop bit e Turn off hardware handshaking e Set the program for the com port to which the display is connected e To see your typing on the PC monitor set the program for half duplex With the display powered and connected anything you type in the terminal program will appear on the LCD If it does not check the settings and connection If text is garbled chances are that the baud rate is incorrect As you send text to the display characters print from left to right When they reach the end of a line the next character appears at the beginning of the next line When text reaches the end of the display the next character appears at the top left position of the display The layout of the display depends on the font setting The default font as set from the factory uses 6 by 8 pixel characters that display in a 4 line by 20 character format Bear in mind that all instructions that position the cursor printing position work in terms of the current font even if a mixture of font sizes is displayed on the screen See the font instruction ESC F for more information http Awww seetron com sgxmni htm 2002 11 13 SGX 120L User Manual rev2 0 Page 5 of 21 Text Control Codes The table below lists the text control codes A separate section lists the graphics instructions To send control codes from most terminal programs hold down the control key and press another key For example to send ctrl L clear screen hol
29. oftware sending data returns a message to the effect of timed out waiting for port or no serial device detected the loopback connections will probably cure the problem If you are using this display with a single board computer see the manufacturer s documentation for information on connecting serial devices If the serial output is logic level 5V make sure that it is inverted In terms of serial communication this means that the stop bit condition should be low OV or negative and the start bit condition should be high 3 5V or higher Display Contrast Control The control marked contrast on the G12032 board sets the initial contrast of the LCD display Contrast is factory set and should not require adjustment The G12032 s temperature compensation circuit maintains contrast throughout the operating range of 0 to 50 C 32 to 122 F You may tweak the contrast setting by turning this control very slightly while viewing an image on the display Getting Acquainted The best way to get acquainted with the G12032 is to connect power and serial data as outlined in the previous sections boot up a terminal program like the Windows Terminal accessory or Serial Sender from www seetron com and type some text and instructions The text you type in your terminal software will appear on the display When you set up your terminal program remember to e Set the program and the display for the same baud rate e Configure the program for n
30. on 1 Backlight on at startup 2 EEPROM screen 2 shown at startup 4 EEPROM write protection on 8 Default font set to wide 12 pixels wide 16 Default font set to tall 16 pixels high 32 Vertical origin for plot and line at bottom of screen To set multiple options just add up the appropriate values from the table For example to make the G12032 start up with the backlight on 1 and default to the large font wide 8 and tall 16 you would send ESC W 25 Options not added into n are turned off so the screen would be blank at power up not screen 2 EEPROM write protection would be off and the vertical origin would be at the top of the screen To disable all configuration options send ESC W 0 The G12032 reads its EEPROM configuration only at startup so the settings take effect only after the unit is turned off and back on with the SET RUN switch in the RUN position http www seetron com sgxmnl htm 2002 11 13 SGX 120L User Manual rev2 0 Page 14 of 21 X fer Screen to EEPROM ESC X n Transfer the current screen contents to EEPROM screen n where n is in the range 0 16 This instruction may be disabled by the EEPROM protect configuration setting written by ESC W above If this is the case ESC X has no effect To display a screen that has previously been stored in EEPROM use ESC E Be careful with XFERS since EEPROM screens 0 and 1 contain the font bitmaps used to display text If you accidentally overwrite these images text may ch
31. ontrol The G12032 ignores nulls without storing them in its data buffer Sending a null is the equivalent of a brief time delay Delay lengths depend on serial speed at 2400 baud a null takes 4 milliseconds ms at 9600 1 ms http Awww seetron com sgxmnl htm 2002 11 13 SGX 120L User Manual rev2 0 Page 6 of 21 Home Cursor ASCII 1 Control A Control A moves the cursor to position O upper left corner of the display Begin Inverse Text ASCII 2 Control B Control B begins inverse printing Any text printed after ctrl B will be printed in light pixels on a dark background Control C ends inverse printing Cancel Inverse Text ASCII 3 Control C Control C cancels inverse text printing begun with ctrl B Ignored ASCII 4 Control D Control D is ignored but takes space in the buffer Use control if you need a time delay Ignored ASCII 5 Control E Control E is ignored but takes space in the buffer Use control if you need a time delay Ignored ASCII 6 Control F Control F is ignored but takes space in the buffer Use control if you need a time delay Ignored ASCII 7 Control G Control G is ignored but takes space in the buffer Use control if you need a time delay Backspace ASCII 8 Control H Bksp Key Backspace which may also be sent as control H causes the cursor to back up one column and print a space leaving the cursor in that column Note that backspace works in terms of the font size in effect at the t
32. or is shut off Upon receiving serial input the G12032 discontinues the slide show and responds normally printing text and processing instructions as described later in this manual Since SET mode allows you to change startup settings stored in EEPROM you should set the unit to RUN mode before sending serial data to it Disconnect power move the switch to RUN and reconnect power With the display in RUN mode connect serial input to the terminals marked SER and GND Set your terminal software to 2400 or 9600 bps matching switch 2 on the G12032 with no parity 8 data bits 1 stop bit Connect power and type some text Browse this manual and try typing the various text and graphics instructions See the Recipes section for exercises that explore some of the display s capabilities Configuring the G12032 A pair of switches on the G12032 configure the display Set switches with power off Run Set Set the display to receive and display serial data run or to cycle through a slide show of preloaded graphics set The slide show stops when the display receives serial data SET mode enables use of the instruction ESC W write startup data to EEPROM Startup settings that can be configured with ESC W include backlight on off EEPROM write protection startup screen font size and location of the vertical origin See the detailed description for further information on using ESC W In normal operation this switch should be set to RUN to prevent
33. ordinates upside down so that coordinate 0 0 is at the lower left corner of the screen and 119 31 is at the upper right ESC V does not affect the byte coordinate system used with ESC A and ESC B Mode Logic When the G12032 plots points or lines on the screen it be asked to draw over previously drawn pixels Using the mode command you can set the logic it uses to determine how to combine new and old pixels OR mode 0 Turns white pixels black black pixels remain black XOR mode 1 Turns white pixels black black pixels white Creating and Downloading Bitmap Fonts and Graphics The G12032 lets you create and download your own text font and graphics screens Its 8kB of EEPROM http www seetron com sgxmnl htm 2002 11 13 SGX 120L User Manual rev2 0 Page 15 of 21 stores the text font and up to 15 full screen images This memory is nonvolatile it retains its contents even with power removed but can be rewritten up to 100 000 times You can create fonts and images using standard PC based graphics programs A Windows conversion and downloading utility is included with the G12032 disk The utility handles graphics files in the following format e Windows bitmap bmp format e Black and white only 1 bit per pixel e No compression e 120 by 32 pixels This file format is supported by the Windows Paint accessory included with Windows 95 and later Many other graphics programs support this format as well Here s how to set up the Paint
34. ption repair replace or refund the purchase price Return the product with a description of the problem We will return your product or its replacement via standard shipping Expedited shipping is available at the customer s expense Note Physically abusing the module removing the daughterboard from the LCD or attempting to repair or modify the module or the daughterboard voids this warranty Trademarks Windows is a registered trademark of Microsoft Inc Other trademarked names that may be mentioned in the body of this document are the property of their respective holders Contacting the Manufacturer Scott Edwards Electronics Inc 1939 S Frontage Road Suite F Sierra Vista AZ 85635 USA phone 520 459 4802 fax 520 459 0623 web www seetron com email info seetron com Quick Checkout and Demonstration You can demonstrate the G12032 without a serial connection Put the RUN SET switch into the SET position and connect a 9V battery or 7 to 10Vdc source to the terminals marked 9V on the serial daughterboard Connect the red wire to Alternatively connect regulated 5Vdc to the terminals marked 5 and GND at the left edge of the board Important make sure polarity is correct Reversed power will damage the G12032 and or your 5V power supply With power connected the display will run a slide show of the factory loaded font and images in its EEPROM memory The slide show demo runs until the unit receives serial input
35. red at EEPROM locations 0 and 1 Each character occupies a specific 6 by 8 pixel rectangle of these screens as shown in figure 3 If you create your own font you should probably use this one files chars0 bmp and chars1 bmp on the starter disk as a starting point Just open the appropriate file with Paint and make your changes Design Notes and Specifications The G12032 is designed to speed prototyping and enable the creation of bench top instruments requiring a serially driven text graphics display It is not meant for direct use by non technical users or for incorporation into mass produced consumer equipment It has not been tested to EMC EMI ESD standards The same is true of most single board computers and other subassemblies whose specs do not specifically include compliance data It is up to the purchaser to determine whether the G12032 is suitable for the intended use This unit is designed and manufactured to high standards of quality This notice is simply intended to head off invalid assumptions that might affect decisions about using the G12032 in consumer products Differences from the G12864 The G12032 is similar to the G12864 graphics display There are a few differences Feature G12032 G12864 Size in pixels horizontal x vertical 120x32 128x64 Separate memory layers for text and graphics NO YES Font layout in pixels horizontal x verti
36. s shortcuts Type this Purpose effect ent L Clear screen llesc LJJzJ Draw a line from xy coords 10 10 to 58 10 llesc TzV Draw a line to xy coords 58 22 esc TJV Draw a line to xy coords 10 22 esc TJJ Draw a line to xy coords 10 10 completes box http www seetron com sgxmnl htm 2002 11 13
37. w E eprom image ESC E n Transfer a 480 byte image from EEPROM page n to the screen Valid numbers are 0 through 16 Whatever is on the screen at the time the ESC E instruction is received is completely replaced by the stored image To transfer an image from the screen and into EEPROM use ESC X NOTE Earlier models firmware version 24 and below were limited to screens 0 7 F ont Size and Source ESC F n Set the font size and EEPROM page that serves as the source of the font bitmaps Font size is determined by the lower two bits bits 0 and 1 of the value of n as follows http www seetron com sgxmnl htm 2002 11 13 SGX 120L User Manual rev2 0 Page 11 of 21 Size Screen Value of width x height in Organization n ixels lines x P characters line 0 small 6 x 8 4x20 1 wide 12 x 8 4x 10 2 tall 6 x 16 2x 20 3 large 12 x 16 2x10 The figure below shows the effects of font scaling Font Size Screen Sample Character screen 6 x8 pixels 0 SERS BE Sc 10 Character positions for each font shown in red Fonts may be mixed on the screen Figure 4 Effects of font scaling se 19 bd 19 19 4 lines x 20 characters 12 x 8 pixels 4 lines x 10 characters 6 x 16 pixels 2 lines x 20 characters 12 x 16 pixels 2 lines x 10 characters Different font sizes can be freely mixed on the screen Just remember that all positioning instructions work in terms of the font size in effect at
38. zine Do not scrub hard or you may damage the display surface Wipe off saliva or water immediately Contact with water over a long period of time may cause deformation or color fading Don t allow the LCD to come into contact with oil and fats e Condensation on the surface and contact terminals due to cold will damage stain or dirty the polarizers After products are exposed to low temperatures they must be allowed to warm up before coming is contact with room temperature air e Do not attach anything to the display screen This may leave scratches or marks e Do not touch the display screen with bare hands This will stain it Skin oils and cosmetics are http www seetron com sgxmnl htm 2002 11 13 SGX 120L User Manual rev2 0 Page 19 of 21 detrimental to the polarizers e Do not drop or jar the LCD module as you may crack or chip the glass Installing the LCD Module The LCD manufacturer suggests the mounting arrangement shown below The protective plate would be a transparent window the fitting plate would be the panel or enclosure The mounting holes accommodate 2 56 machine screws standoffs The BEZ 120 mounting kit available from www seetron com includes a polycarbonate protective plate and all needed mounting hardware instructions Do not use glue to mount LCDs Glue epoxy silicone sealant etc can penetrate and damage delicate electronics and optics inside the LCD module Damage by abuse is not covered by warranty
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