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1. 178 mm 190 mm Figure 7 2 t amp m elektronik bielefeld germany 69 5 mm 65 mm 124 mm Digitizer User Manual Version 2 1 Controller Connectors This chapter contains information about the I O connectors on the front panel and back panel of the Digitizers Controller including pinouts and signal descriptions for each connector Table 7 1 summarizes the functions of the connections and the controls on the Digitizers front and back panel Figure 7 3 shows the front panel layout and Figure 7 4 shows the back panel for a Digitizers Controller Table 7 1 I O Interface External Connector Description 1 Serial 9 pin DSUB male RS232 Serial Port 2 Tablet 50 pin DSUB male External Twisted Pair 1 O Signals 3 Fuse 1A 4 Power 3 pin Power connector 18 36 V DC reverse polarity protected 6 Switch Power ON OFF Switch TABLET 1 RS 232 Serial Connector 2 44pol DSUB Tablet connector Figure 7 3 4 Power Supply Connector 24 V 3 FUSE 1 A 5 ON OFF Switch Figure 7 4 t amp m elektronik bielefeld germany 10 Digitizer User Manual Version 2 1 RS 232 Serial Connector Table 7 2 lists and describes the RS 232 serial connector signals Picture 7 1 shows the loca tion of the Pin Number from the 9 pin DSUB female connector Table 7 2 RS 232 Serial Connector Pin Signal Name Signal Description n u TxD Transmit Dat2. crosshair An interpolation between this wire and the next wire will be used to calculate the accurate position of the crosshair cursor This will be done in both directions x and y t amp m elektronik bielefeld germany 17
3. 28 P4 4 43 P2 1 4 xSHCP x Shift Clock 29 P4 4 44 P2 1 5 x MR x Reset Shift Register 30 x MR x Reset Shift Register Picture 7 2 12 Digitizer User Manual Version 2 1 Tablet The tablet shown in Figure 8 1 consists of a Tablet Adapter with an integrated RF Module for communication with the Pointing Device and the necessary x and y wire driver The distance between each wire in x and y direction is 20mm The maximum active scan area in x and y direction can calculated from the following formula Scan area in x or y direction n x 16 1 x 20mm 80mm Where n is the number of boards of the corresponding x or y direction Example 10 boards in x direction all wires connected 3 boards in y direction all wires connected Calculation in x direction x scan 10 x 16 1 x 20mm 80mm 3100mm Calculation in x direction y scan 3 x 16 1 x 20mm 80mm 860mm Tablet Radio Module x10 Board 16 wires 50pol DSub A 3 2 4 Ro Figure 8 1 Picture 8 1 Picture 8 1 shows one x boatd that can drive 16 wires Connection to the next board is made via a 20pol flat cable t amp m elektronik bielefeld germany 13 Digitizer User Manual Version 2 1 Zero Point and Top Right Definition The zero point definition is shown in Figure 8 2 Detail A It is 40mm away from the first wire in either x and y direction The top right definition in Figure 8
4. information to the tablet over air Furthermore the Microcon troller scans the keys and detect a low voltage of the battery The Pointing Device contains a Lithium Polymere Battery to operate about 10 hours without charging The main measures of the Pointing Device is shown in Picture 9 1 Pointing Device Circuit Board y RF Controller Coil with Crosshair Cursor External Charger MSP430 Microcontroller Figure 9 1 Picture 9 1 g wo N Out of Scan Area LED External Charger g N ba On Off Switch On off LED p 170 mm t amp m elektronik bielefeld germany 16 Digitizer User Manual Version 2 1 Scan Algorithm In this chapter the principal scan algorithm is explained The most efficient method takes place if the M parameter in the init command is 2 Picture 10 1 shows the simplified dynamic scan atea anywhere in the entire tablet Picture 10 1 140 mm 140 mm amex Cursor Dynamic Scan Area 140mm x 140mm The dynamic scan area follows the movement of the cursor The cursor is approximately in the middle of this area except on the boundaries of the tablet This area can be lost if the movement of the cursor is grater then 900mm sec In case of lost this area a scan over the whole tablet takes place automatically to readjust the dynamic scan area The algorithm calculates the number of the x and y wire left and below the pointing devices
5. 2 Detail B It is 40mm away from the last wire in either x and y direction 50pol DSub Tablet Adapter Q G RA awaa oe ee wee Zero Point pert ttt ee ee ee 40mm Pal y direction Ti t amp m elektronik bielefeld germany 14 Digitizer User Manual Version 2 1 Mounting Information The Tablet consists of three parts Two cover plats and one base plate All plates contains hole for vacuum s Detail D The vacuum case has to be mounted by the user All electronic compo nents for wite activation are mounted in the base plate s Figure 8 1 on page 13 Figure 8 5 Detail C shows the position of the 44 pin DSUB tablet connector 8 mm Cover plate Figure 8 3 Base plate a wite x1 155 ny 1 x20 mm lt t Si 7 Figure 8 4 n Number of max wires Vacuum holes wire xn 110 mm nx 1 x20 mm 105 mm a Figure 8 5 Detail C 150 mm 105 mm M 44 Pin DSUBr ccc a Tablet Connector t amp m elektronik bielefeld germany 15 Digitizer User Manual Version 2 1 Pointing Device A simplified Logic Diagram of the Pointing Device is shown in Figure 9 1 some features not shown The Circuit Board contains the necessary Filter and Amplifier to detect the magnetic field generated from the wires inside the tablet The MPS430 Microcontroller digitizes the received analog magnetic field and send this
6. Digitizer Cordless Pointing Device Interface Cable 44pol DSUB Controller Figure 6 1 t amp m elektronik bielefeld germany 7 Digitizer User Manual Version 2 1 Controller Block Diagram The Controller is divided in to three parts see Figure 7 1 The Power Supply e The FPGA Board with Logic and a 32Bit Softprocessor The Driver Board Picture 7 1 All three parts are covered in a small case Picture 7 1 on the right side The mechanical dimensions of the case are described later in this chapter Driver Board FPGA Board Tablet Interface Scan Logic Input 24V 44pol DSUB Outputl 12V Output2 3 3V Power Supply 32Bit Microcontroller RS232 TTL NIOSH lt lt gt Figure 7 1 Power Supply The power supply is integrated on the Driver Board Specification Input 24VDC 1A Output 1 12V Output 2 3 3V FPGA Board The main part of this board is a FPGA Altera Cyclone III The FPGA contains a 32Bit Softprocessor NIOS II and the necessary logic to scan the wires on the tablet Driver Board The Driver Board connects the controller and the tablet over a 44 pin Connector For optimal noise immunity all logic signals are converted to a 3 3V RS422 like differential signal t amp m elektronik bielefeld germany Digitizer User Manual Version 2 1 Controller Mounting Information The main measures of the controller case are shown in Figure 7 2 165 mm FRONT VIEW Tablet oOo lt gt
7. Digitizer User Manual Version 2 1 Table of Contents Parts Checklist satione eion eri a a AA nT 2 What you need to use the Digitizer uuseueeeeee ees 2 Mounting the Digitizer tablet ooo eesssseceeeeteecteeeteeeeens 2 TAGGOGUCHOM a edatcsee ree aM 3 Commands faren a ees 4 AES aa a a AA 4 E A ida saa declare po tetscaaa seated 5 Digitizer Block Diagram oii eee cceccccesssccceeeseccceeesaees 7 Controller Block Diagram 1000 lee ceesencceeessnceceessseceeees 8 Controller Mounting Intorman n css cocteeneesee eens 9 Controller Gomme ctorss Aon ta tn tore a a a 10 BS NON OOOO and lees slate ENEE sales 11 EGE COUMONOP asd cin n EEE E E E E horse EEE 12 Tableta eT Er A PTE POT ae 13 Zao Pot and Op AONE DenniiON torgen 14 Mounting Intermanon sognene ian tte aden 15 POU Device occ Gea ads cate necce A 16 SCAMAAIO OMEN e055 5 2cs sheet detract a 17 t amp m elektronik bielefeld germany 1 Digitizer User Manual Version 2 1 Parts Checklist The Digitizer System consists of o Digitizer 3x1 Series digitizing tablet o Digitizer Controller o Digitizer Interface Cable with 44 pin connector e Host interface cable with 9 pin connector Cordless Pointing Device Charger Note The Digitizer Controllet is a small enclosure and attached via the Picture 1 1 Digitizer Interface Cable to the back of the tablet The controller contains the electronics that drive the Digitizer Connect the Digitizer Interface Cable here What you need
8. a RxD Receive Data n u GND n u Ground mu mu OlLmamIAILAI MIB Jv Nj e mu t amp m elektronik bielefeld germany Picture 7 1 6 9 Pag o0 04 be Ie k Ae Serial Female Connector Internal connection Pin 1 4 and 6 are connected together Pin 6 and 7 are connected together 11 Digitizer User Manual Version 2 1 Tablet Connector Table 7 3 lists and describes the connector signals between the Controller and the Tablet Picture 7 2 shows the location of the Pin Number from the 44 pin DSUB female connector t amp m elektronik bielefeld germany Table 7 3 Pin Signal Name Signal Description Pin Signal Name Signal Description Pin Signal Name Signal Description 1 3 3V 16 3 3V 31 3 3V 2 ySHCP y Shift Clock 17 xSTCP x Stotre Data Clock 32 P2 4 3 ySHCP y Shift Clock 18 xSTCP x Store Data Clock 33 P2 4 4 y MR y Reset Shift Register 19 x485 x Shift Data 34 P4 3 5 y MR y Reset Shift Register 20 x485 x Shift Data 35 P4 3 6 GND Signal Ground 21 GND Signal Ground 36 GND 12V Ground 7 ySTCP y Store Data Clock 22 P4 6 37 P2 2 8 ySTCP y Store Data Clock 23 P4 6 38 P2 2 9 GND Signal Ground 24 GND Signal Ground 39 12V 0 y485 y Shift Data P2 3 1 y485 y Shift Data 26 P4 5 41 P2 3 2 3 3V 27 P2 0 42 P2 0 3 xSHCP x Shift Clock
9. return information In syncron scan mode M Parameter 2 the query command returns the latest scan information from the Digitizer Syntax Q lt CR gt Retutnd Values in ASCIL_ FORMAT as followed Table 5 1 1 Character Start of Text STX 0x02 2 Character Status 03 0x30 0x33 3 Character Key Code ORG 0x30 0x36 4 Character x Coordinate high Oped 0x30 0x39 5 Character x Coordinate 6 Character x Coordinate 7 Character x Coordinate 8 Character x Coordinate low 9 Character y Coordinate high 10 Character y Coordinate 11 Character y Coordinate 12 Character y Coordinate 13 Character y Coordinate low Status 0 Key Code and x y coordinates are valid values 1 Key Code and x y coordinates are valid values and Low Battetie is active 2 Cursor is out of proximity 3 Cursor is out of proximity and Low Batterie is active Key Code 0 No Key is activated 1 Key 1 is activated 2 Key 2 is activated 3 Key 3 is activated 4 Key 4 is activated 5 Key 5 is activated 6 Key 6 is activated x y coordinate The unit of the x y coordinate is 0 1 mm t amp m elektronik bielefeld germany 5 Digitizer User Manual Version 2 1 Q Returnd Values in Binary Format as followed Table 5 2 Byte Bit 7 5 4 3 2 1 0 1 Status 1 1 0 0 O Bat Pr 2 Key Code 0 0 0 O k2 k1 k0 3 x Coordinate low order Byte 0 OO E
10. tart of Text ASCII 0x02 in a command line are disregarded Characters are case sensitive Parameters must be with minimum of one Blank Character The first value after each parameter must be followed immediately subsequent values are comma separated Terminator is lt CR gt There are two types of responses information text and result codes which are sent back to the Host Information text may consist of a single line or multiple lines and are always ASCII Characters Result codes may be transmitted in ASCII Format or Binary Format depending of Parameter F in the initialization command Connection between the Host and the Digitizer uses a RS232 interface with the following settings 38400 bps 8 data bits no parity 1 stop bit 8 N 1 no handshake Power on the Digitizer and remain until the startup message is received Startup Message gt Digitizer v x x Subsequent to received the Startup Message the Digitizer must be initialized If one provides a new command the prior command will be suspended except for the init command t amp m elektronik bielefeld germany 3 Digitizer User Manual Version 2 1 Commands init Initialisation of the Digitizer Init allows you to initialize the Digitizer with various parameters You must provide this command after receiving the Startup Message when the Digitizer is powered on You would also have to provide this command when changing the Pointing Device Furthermore you could pro
11. to use the Digitizer e A Host with an RS232 Communication port Graphic application software that accepts digitizer input Optional a Vacuum System at the back of the tablet Mounting the Digitizer tablet Picture 3 1 You can mount the tablet on a stable Al Frame s Picture 3 1 Be sure that the mounting frame builds not an electrical closed frame because that decrease the magnetic field produced by the wires in side the tablet s Picture 3 2 Pi icture 3 2 Isolation d The minimum distance between the table and an extra illumination device is 500mm s Picture 3 3 Use an illumination device with low electrical and magnetic field emission for example an LED Illumination Picture 3 3 e Illumination g Device Tablet t amp m elektronik bielefeld germany 2 Digitizer User Manual Version 2 1 Introduction This document describes the command interface between a Host and the Digitizer The Digitizer uses two output formats ASCII and binary All commands from the Host are in ASCII Format which can be send online or manually use a terminal emulation program e g Tera Term Any command can be given at any point of time even during an active data connection Each command line sent to the Digitizer consists of a body if applicable and a terminator The command line uses ASCII Characters in the range from 32 to 127 Control characters other than lt CR gt and lt STX gt carriage return ASCII 0x0D S
12. vide this command to reinitial ize the Digitizer Syntax init N n1 n2 n3 n4 F format M mode K Rey E echo lt CR gt Parameter N Serial number from the Pointing Device Factory setting N n1 n2 n3 n4 e n1 n2 n3 values from 0 to 255 n4 even numbered values from 0 to 254 Example N12 255 0 4 serial number 12 255 0 4 Parameter F Output Format F format e 1 ASCII Format e 2 Binary Format Example F1 Data Format ASCII Parameter M Scan Mode M mode 1 Scan one time after a valid scan command e 2 Scan continuously after a valid init command Example M1 Scan one time after a valid scan command Parameter K Key Mode K mode e 1 Key is active one time after actuated e 2 Key is active as long as actuated Example K1 Key is active one time after actuated Parameter E Command line Echo E echo e 1 Echo on 2 Echo off Example E2 Echo off no echo of the command line and no information text t amp m elektronik bielefeld germany 4 Digitizer User Manual Version 2 1 Commands Q Query Quety returns the x y Position the Key Code and Status Information in ASCII or Binary Format depending of the F Parameter in the init command For this command no body is required The Digitizer has two different scan modes depending on the M Parameter given by the init command In asyncron scan mode M Parameter 1 the query command initiate one scan and the Digitizer responds with a
13. xo x4 S 1x2 soll ex0 4 x Coordinate 0 Oa eT cl ONO X83 7 x6 5 x Coordinate high order Byte 0 0 0 O x15 x14 x13 x12 6 y Coordinate low order Byte 0 O y5 y4 y3 y2 yl yO 7 y Coordinate 0 O yll y10 y9 y8 y7 y6 8 y Coordinate high order Byte 0 0 0 O y15 yl4 y13 y12 Status Query The highest two bits in the Status Byte are always 1 This indicates the launch of a data transfer and can easily be used for synchronization In all subsequent bytes the highest two bits are zero Pr 0 Cursor in active area Pr 1 Cursor out of proximity Bat 0 Battery OK Bat 1 Low Batt is active Table 5 3 Key Code Key Number k2 k1 k0 No Key 0 0 0 1 0 0 2 0 1 0 3 0 1 4 1 0 0 5 1 0 6 1 1 0 x y coordinate The unit of the x y coordinate is 0 1 mm t amp m elektronik bielefeld germany Digitizer User Manual Version 2 1 Digitizer Block Diagram The principal Digitizer configuration are shown in the simplified block diagram in Figure 6 1 There are three parts which are used to implement one Digitizer The Controller The Tablet e A Cordless Pointing Device All three parts are described in more detail later in this chapter The Digitizer uses only one external Power Supply 24 VDC Communication between a Host Computer and the Digitizer uses a standard RS232 connection with a simple protocol which are described in chapter Query on page 4 and 5
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