Tektronix 4953 Instruction Manual Download

Page: 1 / 42

Summary of Contents for 4953

Page 1: ...TTED TO EXCELLENCE c 13 si U f i i c r jr X X rr 4953 4954 GRAPHICS TABLET INSTRUCTION MANUAL Tektronix Inc P O Box 500 Beaverton Oregon 97077 MANUAL PART NO First Printing FEB 1975 070 1791 01 Thl Pr...

Page 2: ...rmance Checks Miscellaneous Circuit Verifications Delay Verification Bit 1 Verification Bit 2 Verification Bit 3 Verification Bit 4 Verification Bit 5 Verification CR Strap Verification ESUP Strap Ver...

Page 3: ...n _ r Yr thk K 1 Fig 1 1 4953 and 4954 Graphics Tablets 4953 4954...

Page 4: ...e transmission appearing on the terminal display The position of the Graphics Tablet in a computer terminal system is shown in Fig 1 2 The 4010 family terminal can operate in a mode termed Graphic Inp...

Page 5: ...nt PEN illuminates when pen pressure is applied DATA Illuminates when data is in the process of being transferred POWER Illuminates when Power is applied to both the Graphic Tablet and the terminal Ta...

Page 6: ...from terminal bus 180 V at 10 mA supplied by the tablet power supply 5 V at 1 5 A supplied by the tablet power supply Environmental Specifications Temperatures OPTIONAL ACCESSORIES Operating from 0 C...

Page 7: ...ct the 25 pin connector on the Tablet Control card interconnecting cable to J1010 on the Power Module rear panel and secure with the two attaching screws Fig 2 2 To Tablet 1791 04A Fig 2 1 Pen and Tab...

Page 8: ...a Header Character data haf T T aPPr Priate de to a e data that follows In addition the Header Characters are used by computer software to interpret the data string that follows The parteular Header...

Page 9: ...e option is in the OUT position Pen A coordinate set is sent when the pen is depressed 4 also see additional functions 6 7 Disable on Leaving Presence Setting this bit with the status strap set to IN...

Page 10: ...SINGLE POINT N0 EFFECT ON 1 1 ENQ 5 NAK 27 37 5 53 E 69 U 85 e 707 u 777 TABLET ENABLE 1 1 2 ACK 6 SYN 22 38 6 54 F 70 v 86 f 702 V 118 LOCAL OFF MULTI PLE POINT 1 1 1 BEL 7 ETB 23 39 1 55 G 77 W 87 g...

Page 11: ...tus if the terminal is ON LINE just as if it had received an ESC ENQ sequence from the computer If the pen leaves presence after data has been sent while the tablet is not enabled then status will be...

Page 12: ...ode with another Control Command ESC 1 for 12 bits ESC A for 10 bits from the terminal keyboard The READY indicator should illuminate 10 Without leaving presence move the pen to a point about 1 1 2 in...

Page 13: ...eted This point will be the coordinates of the pen s position when the Control Command sequence is completed and will also be preceded by a SUB Header Character the cursor will move to the new pen loc...

Page 14: ...n the pen moved to another location and pressed again a second point is sent preceded by a SUB Header Character A vector is drawn between these points if Local Display is selected Note that after the...

Page 15: ...the last Multiple Point Presence Multiple Point Presence mode is enabled by a Control Command which has bits 2 and 3 1 in the Command Character for example ESC 7 12 bits or ESC G 10 bits Multiple Poin...

Page 16: ...ated in Fig 2 7 4 Bring the pen into the presence area of the tablet Press the pen hold it pressed and move it around on the tablet surface The PEN indicator should remain lit as long as the pen remai...

Page 17: ...a suitable format before putting it on the Terminal minibus Data is transferred as a Header Character followed by four to six data characters as follows H1Y This contains the five most signifi cant b...

Page 18: ...ifies the internal voltage setting for which the unit is wired when shipped from the factory If the jumper arrangement is changed for any reason changing the internal voltage setting attach a tag with...

Page 19: ...and several other points unless the power cord is disconnected Front of Power Moduli Jumper S Holes Fig 3 2 Line voltage jumper hole locations FUSES There is one fuse located at the lower corner of t...

Page 20: ...y selecting the delay IN or OUT With delay IN there is an adjustable 15 to 60 ms delay after each coordinate sent With delay OUT the delay is about 6 ms ESUP Echo Suppression COMSUP Computer Suppressi...

Page 21: ...ins grids of magnetically biased wires under the tablet surface The biasing is done at the factory but it can be disrupted if a magnet or magnetized article is placed on the Tablet This will result in...

Page 22: ...1 I i pi Resultant Display T l Error IBStillll 1 1 s mm mms mmmmm X 1791 17 Fig 3 6 Error caused by uneven tablet bias A 7 x IS fTEK ft m BIASING MAGNETJ mm M S y m W f tPpli 5 V Jr Magnet Path lisit...

Page 23: ...ONiXTM SOOseries mainframe with the DM 501 Digital Multimeter 3 Ohmmeter PERFORMANCE CHECKS Performance Check Strap Positions OR IN HEADER CONTROL LARGE SMALL Set to appropriate tablet size TRANSMIT D...

Page 24: ...t with ESC i The READY Indicatorwill light and the DATA indicator will blink once 2 Come into presence but do not press the pen READY will be dim as it will be blinking rapidly The frequency of the bl...

Page 25: ...2 Place the terminal ON LINE then bring the pen into presence and press the pen several times without leaving presence The READY and DATA indicators should blink each time the pen is pressed The PEN...

Page 26: ...l power back on Position the terminal LOCAL LINE switch to LOCAL and arm the tablet with ESC 7 2 Bring the pen into presence and the alpha cursor should move to the relative pen position Press the pen...

Page 27: ...Type ESC Ctrl Z to turn on the terminal crosshairs 5 Place the terminal ON LINE 6 Lift the pen out of presence Nothing should happen 7 Bring the pen back into presence The crosshair cursor should disa...

Page 28: ...r internally Set the oscilloscope controls for 2 V Div and 2 s Div The pulse for each axis should resemble that in Fig 4 8 If not thepulser is not operating properly 6 Remove both covers from the Powe...

Page 29: ...10 Preamp waveform This waveform is very sensitive The probe must connect directly to pin 12 not through a clip extender or the nearest lead of the 150 pF capacitor Note also that variation may occur...

Page 30: ...Module lights whenever PEN is present READY DATA RVCC READY goes low when the tablet is armed and ready to transmit data The READY indicator lights when READY is present DATA goes low when data is be...

Page 31: ...of Presence condition After these delays the counters begin to count until a DONE pulse stops them it is this digitized count that determines the pen coordinates If the counter counts past its maximum...

Page 32: ...of coordinates only when the pen is pressed and when the Tablet is armed for pen mode Otherwise the Transmit Initiate block is allowed to operate freely when the Tablet Sequencer is ready to initiate...

Page 33: ...echoed data characters The three presence blocks Presence Latch True Presence and Presence Status enable the appropriate Header Characters for the pen s presence status and initiates transmission whe...

Page 34: ...pin 6 is then high and U21 1fi pin 9 is high This produces the TABLET STROBE signal on pin 6 of U21C The Tablet Sequencer is stopped fey DRBUSY whenever a Hard Copy is being made or when the screen i...

Page 35: ...a DONE pulse occurs prior to the COTrrPtettorc f tne 128 count Digital Delay it is ignored If the DONE pulse occurs during the next 96 counts UNDERFLOW is asserted indicating that the pen is too far...

Page 36: ...t operation has been signalled by the third character in the Cont rol Command sequence pin 7 of U461 the CSTROBE for the XLOY byte is disabled andthat byte does not appear on the bus When the Characte...

Page 37: ...rom U171A is also input to U291B the output of which places the Header Character circuitry in the SUB configuration However since the Character Identifier circuitry is not identifying this character a...

Page 38: ...rol card and within the Power Module Also provided is the 180 V required to the pulser to fire acoustic waves in the X and Y axes of the tablet grid In addition strapping for the selectable line volta...

Page 39: ...r Amplifier The Buffer Amplifier prevents the closing of the pen switch from generating a signal in the pen s pickup coil Q413 functions witty R 4 11 and R409 to provide a switch buffer amplifier for...

Page 40: ...V PESJ ONLY JtOUb CUR SCR OR PEKJ ASS Y GRAPHICS TABLET 4953 4954 CZ l8 T91 34 6 7O 34 3 0O UP CONTROL BOARD X c r cr C JIOIO...

Page 41: ...ers r 7 J G435A T 5 3SN 3 i giT a H U435D 7 433 N 12 BIT I ij BIT to d T4ISN H7N C STROBE KlOLK LU T STROBE fD Ht Y i cs L LOXE END COUMT READY VALUES AND SERIAL NUMBER jRANGES OF PARTS OUTLINED OR DE...

Page 42: ...L LOCATION R32 s IQO T3i J WV io eo C33 C33 68 lOO 1 Hf r K 6 77 C3S C4D 4 7 T n uF R 33 JR31 h OR WH BLK C34 USI ISO SN7e702 H XC35 4 F f 5V 35r OOK1B 0 brown blue jeB YELLOW J23S 7 RED YELLOW BROWN...

Search results

Summary of Contents for 4953

Reviews:

Related manuals for 4953

Brands by name

Popular brands

Tektronix 4953, Instruction Manual

Search results

Summary of Contents for 4953

Reviews:

Related manuals for 4953

Brands by name

Popular brands