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Содержание 4853

Страница 1: ...KEITHLEY Model 4853 IEEE 488 Interface Instruction Manual 4 z Vf 5 Contains Operating and Servicing Information Publication Date October 1987 Document Number 4853 901 01 Rev C...

Страница 2: ...SPROVIDED HEREIN ARE BUYER S SOLE AND EXCLUSIVE REMEDIES NEITHER KEITHLEY INSTRUMENTS INC NOR ANY OE ITS EMPLOYEES SHALL BE LIABLE FOR ANY DIRECT INDIRECT SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES A...

Страница 3: ...Instruction Manual Model 4853 IEEE Interface 1984 Keithley Instruments Inc Cleveland Ohio U S A Document Number 4853 901 01...

Страница 4: ...DO LOG Off D1 LOG On Relative ZO REL Off Z1 REL On Trigger TO Continuous on talk T1 One shot on talk T2 Continuous on GET T3 One shot on GET T4 Continuous on X T5 One shot on X Execute X Execute othe...

Страница 5: ...ommand Codes 2 4 2 6 Command Sequence 2 5 2 6 1 Addressed Command Sequence 2 5 2 6 2 Universal Command Sequence 2 5 2 6 3 Device DependentCommand Sequence 2 5 SECTION 3 OPERATION 3 1 Introduction 3 1...

Страница 6: ...ration V and Storage L 3 14 3 5 13 Status Word U 3 15 3 6 Talker Only Operation 3 16 3 6 1 Talk Rate 3 16 SECTIOIM 4 THEORY OF GPERATIOIM 4 1 Introduction 4 1 4 2 Circuit Description 4 1 SECTION 5 MAI...

Страница 7: ...3 2 3 4 Contact Assignments 3 3 3 5 Typical lEEE 488 Bus Driver one of 16 3 3 3 6 TO ADDRESSABLE and Primary Address Switches Factory Set Address22Shown 3 3 3 7 General Format UO Command 3 12 3 8 Sta...

Страница 8: ...ress Switch Positions 3 4 3 3 HP 85 IEEE 488 BASIC Statements 3 5 3 4 Model 4853Interface Fuunctlon Codes 3 6 3 5 IEEE Command Groups 3 6 3 6 General Bus Command 3 6 3 7 Default Conditions Status Upon...

Страница 9: ...ice of your instrument may be directed to the applications engineer at any of these locations 1 4 MANUAL ADDENDA Information concerning improvements or changes to the in terface which occur after the...

Страница 10: ...s limited to 15 devices but this number may be reduced if higher than normal data transfer rates are required or if longer than normal cables are used Several devices may be commanded to listen at onc...

Страница 11: ...se conditions are not met the source mustthen wait until NRFD and NDAC lines have the correct status Because of the possibility of a bus hang up some controllers have time out routines to display erro...

Страница 12: ...t by either the controller or an external device The following is a brief description of each command 1 REN Remote Enable When the controller sends the REN command the instrument will be set up for re...

Страница 13: ...lk The controller sendsthe UNT command to clear the bus of any talkers 2 4 5 Device Dependent Commands The meaning of the device dependent commands is deter mined by instrument configuration Generally...

Страница 14: ...listeners from the bus first so that only the addressed device responds 2 6 2 Universal Command Sequence The universal commands are sent by setting ATN low and then placing the command on the bus For...

Страница 15: ...5 U 21 8 U 0 0 6 ACK SYN 6 6 22 F 6 V 22 f V 0 7 BEL ETB 7 7 23 G 7 w 23 g w 0 0 0 8 BS GET CAN SPE 8 8 24 H 8 X 24 h X 0 0 1 9 HT TCT EM SPD 9 9 25 1 9 Y 25 y 0 0 10 LF SUB 10 26 J 10 z 26 z 1 0 11 V...

Страница 16: ...ly a matter of using more cablesto make the desired connections Because of this flexibility system complexity can range from the very simple to extremely com plex Figure 3 1 shows two typical system c...

Страница 17: ...el 485 NOTE The IEEE 488 bus is limited to a maximum of 15 devices including the controller Also the maxi mum cable length is 20 meters Failure to observe these limits will probably result in erratic...

Страница 18: ...hes Factory Set Address 22Shown 3 2 4 Primary Address Selection The Model 485 must receive a listen command before it will respond to the addressed or device dependent commands sent over the bus Simil...

Страница 19: ...em is causing an intermittentfault when it wasthe software that was causing the problem all along 3 3 2 HP 85 BASIC Statements Many of the programming instructions use examples written in Hewlett Pack...

Страница 20: ...I Service Request Function The ability for the Model 485 to request service from the controller is pro vided by the SR function 6 RL2 Remote Local Function The ability for the Model 485to be placed in...

Страница 21: ...ommands are grouped into two categories 1 Addressed Commands These commands require that the primary address of the instrument agrees with the primary address in the controller s programming language...

Страница 22: ...equence is automatically sent by the HP 85 with the following statement LOCAL 722 END LINE Note that the RMT annunciator turns off NOTE Setting REN false with the LOCAL 7 statement will also take the...

Страница 23: ...obtain the Model 485 status byte Usually the serial polling sequence is used to determine which of several devices has requested service over the SRO line However the serial polling sequence may be u...

Страница 24: ...character is the last byte in the command string The execute character also controls instrument operation in the T4and T5 trigger modes as described in paragraph 3 5 6 NOTE Command strings sent witho...

Страница 25: ...0 1pA or as large as the selected range will permit The REL mode is controlled by sending one of the following commands over the bus ZD REL Disabled Z1 REL Enabled Upon power up or after DCL or SDC ZD...

Страница 26: ...he last byte of its data string or status word The EOl response of the instrument may be sent with one of the following commands KO sends EOl during last byte K1 sends no EOl Upon power up the KO mode...

Страница 27: ...SRQ Disabled 01 Reading Overflow 08 Reading Done 09 Reading Done or Reading Overflow 18 Busy 17 Busy or Reading Overflow 24 Busy or Reading Done 25 Busy Reading Done or Reading Overflow TRIGGER 0 Con...

Страница 28: ...new command 4 IDDCQ An illegal command option such as R8 has been sent This bit is cleared when the status byte is read 5 IDDC An illegal command will set this bit For example N1 is illegal since no...

Страница 29: ...efix PROGRAM COMMENTS 10 REMOTE 722 20 OUTPUT 722 G1X 30 ENTER 722 A 40 DISP A 50 END Set for remote operation Send prefix command Enter command into computer Display on CRT Press the HP 85 run key Th...

Страница 30: ...END LIHE OUTPUT 722 U1 9E 6X END LIHE OUTPUT 722 LOX END LINE Use the following V command to place the instrument in the calibration mode and transmit a calibration value V1E 9 Using this command at...

Страница 31: ...gnize the new switch condition Sending commands to the in strument when it is in the talker only mode may cause the controller to hang up When the Model 485 is used in the talker only mode it may be i...

Страница 32: ...re used to drive the output Data Is buffered by U105 and U107 and Is transmitted to the bus via connector J1007 The primary address switches 8101 select the primary ad dress and permit selection of 31...

Страница 33: ...er supplied with the Model 485 if available If the modified top cover is used cover the holes normally occupied by the IEEE connector and switch Failure to cover these holes could result in a shock ha...

Страница 34: ...ns 19 and 2 Logic 1 5V Information across bus D1 and B1 transceiver 7 U405 pins 18 and 3 Logic 1 5V Information across bus D2 and B2 transceiver 8 U405 pins 17 and 4 Logic 0 OV Information across bus...

Страница 35: ...er 2 Instrument Serial Number 3 Part Description 4 Circuit Description if applicable 5 Keithley Part Number If an additional instruction manual is required order the manual package Keithley Part Numbe...

Страница 36: ...t shown 1753 304 MC 374 IEEE CONNECTOR CS 377 CONNECTOR HARDWARE CS 378 T O ADDRESS SWITCHES SW 449 6 HEAT SINK HS 28 CONNECTOR CS 332 7 STANDOFF ST 171 1 ABLE CLAMP CC 50 1 Figure 6 1 Model 4853 inst...

Страница 37: ...W Oomposition C3 D3 R 76 3 3k R104 Thick Film Resistor Network C3 B1 TF 99 R105 Resistor 330n 5 1 4W Oomposition E2 D6 R 76 330 R106 Resistor lOkD 5 1 4W Oomposition E2 D5 R 76 10k R107 Resistor lOOkD...

Страница 38: ...le to zero Unstable Will not read applied input Overload Calibration only Certificate of Calibration required Data required attach any additional sheets as necessary Show a block diagram of your measu...

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