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Model 2302-V001

RESISTOMAT

Page 33

Brief guide

Operation

Calibration

Test and offset

instructions

RS232 data

output

Introduction &

applications

Description of functions

Accessories and Circuit diagram

RS232 data

output

(stands for: enable block check, W instruction)

The interface is to include a block check character in string transmissions.
This character is appended to every information telegram after the last control
character.

Note:

Power-on state -> block check on.

Example:

Master transmits:"Slave at address 00. Include a block check

character in future transmissions.“

00ebC

Slave responds:

"Message understood"

<ACK>

(stands for: send error status, R instruction)

The device with the transferred ID is to send the number of the error which occurred last.

Example:

Master transmits: "Slave at address 00. Send error status"

00erC

Slave responds:

"No error (error code 00)"

00C

Master transmits:

"Message understood"

<ACK>

Содержание RESISTOMAT 2302-V001

Страница 1: ...93 Gernsbach 76587 Gernsbach RESISTOMAT Model 2302 V001 Note The information contained in the following is subject to change without prior notice No part of this document must be reproduced or process...

Страница 2: ...RESISTOMAT Model 2302 V001 Page 2 Introduction applications Description of functions Brief guide Operation Calibration Test and offset instructions RS232 data output Accessories and Circuit diagram...

Страница 3: ...Model 2302 V001 RESISTOMAT Page 3 Brief guide Operation Calibration Test and offset instructions RS232 data output Introduction applications Description of functions Accessories and Circuit diagram...

Страница 4: ...T Model 2302 V001 Page 4 Introduction applications Description of functions Brief guide Operation Calibration Test and offset instructions RS232 data output Accessories and Circuit diagram Overview of...

Страница 5: ...ion accuracy 16 Measurement range selection 16 Connecting the test unit 17 Shielding 18 Signal lamp for line resistance RL 18 Range transgression 19 RS232 output 19 Special interferences in the case o...

Страница 6: ...RESISTOMAT Model 2302 V001 Page 6 Introduction applications Description of functions Brief guide Operation Calibration Test and offset instructions RS232 data output Accessories and Circuit diagram...

Страница 7: ...sipation means more precise measurement of temperature dependent material In this field of application the automatic temperature offset will save you a lot of time which was needed earlier for separat...

Страница 8: ...by supply line resistances though popular opinion has it that the influence of these lines should be negligible Actually it is negligible only as long as the line resistances do not exceed a certain...

Страница 9: ...onsiderably higher They are by nature influenced by variations in the grid voltage The indicator lamp below the measurement terminals provides a simple means of checking in a closed measurement circui...

Страница 10: ...rgical investigations based on resistance measurement Statistical quality control with computerized evaluation only became efficient on introduction of the RESISTOMAT with an RS232 C output allowing f...

Страница 11: ...also controlled Current source Anelectroniccontrolcircuitsuppliesthecurrentwhichwassetanddisplayedusingtherange selector as soon as the external current path is closed The currents are calibrated with...

Страница 12: ...test unit which is fed into the device via the Cu terminals U U is raised to this level by a high precision pre amplifier The copper terminals prevent the low measurement voltage from being falsified...

Страница 13: ...choice of two different measurement currents for most ranges Select the higher current whenever permissible Zero potentiometer for voltmeter section Voltmeter input potential leads from the test unit...

Страница 14: ...RESISTOMAT Model 2302 V001 Page 14 Introduction applications Description of functions Brief guide Operation Calibration Test and offset instructions RS232 data output Accessories and Circuit diagram...

Страница 15: ...nds following power on you can start performing measurements to an accuracy of 0 1 although between 10 and 15 minutes could pass before the final accuracy is attained If the lowest measurement range i...

Страница 16: ...ts must not be exposed to temperature fluctuations if required sufficientlylongwaitingperiodsshouldbeobservedtoallowcompensation Particularlyheat from human bodies frequently distorts measurement resu...

Страница 17: ...rement current up to the potential taps otherwise the resistance value determined is higher than the actual resistance of the path the current is concentrated over a smaller cross section For stranded...

Страница 18: ...ions can be expected Pole reversal in the current or voltage leads results in displays prefixed with a negative sign although this is purely a cosmetic error Shielding Normally measuring leads in labo...

Страница 19: ...ch are superimposed on the measurement signal thus leading to an unstable display Intefering voltages of the mains frequency also detected everywhere possible are not very critical as they are filtere...

Страница 20: ...ss be caused by very high voltage peaks The Model 2371 protective switchover unit solves this problem On the contact switch setting both the current and potential lines are bridged thus short circuiti...

Страница 21: ...ont panel allows general re calibrations of the device acting proportionallyonallmeasurementcurrents Adjustmentscanthusbemadehereifallranges provide uniformly inaccurate results or even if particularl...

Страница 22: ...RESISTOMAT Model 2302 V001 Page 22 Introduction applications Description of functions Brief guide Operation Calibration Test and offset instructions RS232 data output Accessories and Circuit diagram...

Страница 23: ...spectively to point 6 on the connector strip 1 2 Connect the 2 soldering eyes located at the front between the electrolytic capacitors 220 40 on the current generation board to points 5 6 7 on the con...

Страница 24: ...ut of the voltmeter 10 If the voltage display is consistently wrong as in item 7 the sensitivity trimmer of the digital voltmeter can be readjusted 11 Roughly test the current steps with the ammeter c...

Страница 25: ...te within 0 05 20 If 2 m 3 A exhibits deviations 0 05 R 27 can be corrected on the switch board 21 20 m 3 A must now also be accurate within 0 05 22 Testing the temperature compensation Select any ran...

Страница 26: ...RESISTOMAT Model 2302 V001 Page 26 Introduction applications Description of functions Brief guide Operation Calibration Test and offset instructions RS232 data output Accessories and Circuit diagram...

Страница 27: ...2 2302 V001 PC interface Pin 2 TxD 2 RxD Pin 3 RxD 3 TxD Pin 7 SGND 5 SGND 4 DTR 6 DSR 5 CTR RS232 data output Pin assignment and configuration Initialisation phase After power on the interface needs...

Страница 28: ...rates in bold type The next higher communication level after definition of signal transmission is the communication protocol The protocol used for the interface is a subset of the procedure described...

Страница 29: ...End character The ASCII character Enquiry ENQ Control E CE 0x05 is used as the end character An addressed device responds to a correctly received instruction sequence with an acknowledgement signal Q...

Страница 30: ...acter allowing the device which receives it to check the integrity of the message It is formed through a bit by bit exclusive OR operation on the entire message including the end character Topreventth...

Страница 31: ...nd of an information telegram ETX Control C CC 0x03 Block check character Normally the transmitting device also sends a block check character With its help the receiving device can check whether the m...

Страница 32: ...ith EEPROM parameters Example Master transmits Slave at address 18 Set the character delay to 0 ms fastest transmission C D 18cdC B OC C B B Block check character EOT 18cd STX 0 ETX B Slave responds M...

Страница 33: ...gram after the last control character Note Power on state block check on Example Master transmits Slave at address 00 Include a block check character in future transmissions C D 00ebC E EOT 00eb ENQ S...

Страница 34: ...6h Not used 017h Wrong set hardware command code 018h Wrong set hardware parameter value 019h Wrong parameter number in set format 01ah EEPROM error fa stands for first address W3 instruction The devi...

Страница 35: ...instruction This instruction allows the interface to be set to a new address The instruction is sent to the current address It is thus not suitable for specifying the address immediately after systems...

Страница 36: ...mission of a new one This function is required for example to communicate with stored program controls SPC Example Master transmits Slave at address 00 Set your response delay to 50ms C D 00sdC B 50C...

Страница 37: ...ve responds Message understood The measurement value is 1 237 Ohms and has not been read in previously C B 01 237 OHM 1C C B STX CR LF 01 237 OHM 1 ETX B C F ACK Leading zeros are not suppressed durin...

Страница 38: ...stands for send measurement value R2 3 instruction The addressed device is to transmit the measurement value read in last to the controller This value is accompanied by a flag which indicates whether...

Страница 39: ...ting 0 Parameter 3 Send delay in msec Default setting 0 Parameter 4 ASCII character for FF formfeed printer operation Default setting 12 Parameter 5 ASCII character for CR carriage return printer oper...

Страница 40: ...Parameters 11 17 These parameters cannnot be accessed Parameter 18 Baud rate This parameter contains the software configured baud rate Value Meaning 1 1200 baud 2 2400 baud 3 4800 baud 4 9600 baud 5...

Страница 41: ...rC B 33C C B B Block check character EOT 00pr STX 33 ETX B Slave responds Message understood The value of parameter 33 is 3 147 C B 33 3 147C C B B Block check character STX 33 3 147 ETX B Master resp...

Страница 42: ...med parameters Example Master transmits Slave at address 00 Store the new parameters C D 00seC E EOT 00se ENQ Slave responds Messageunderstood Apointisoutputforeverystoredparameter C F ACK si stands f...

Страница 43: ...r IBM PC Thefollowingprogramsareintendedasshortandeasyexamplestodemonstratecommunications between the interface and a PC and can be used for testing They are not meant to serve as a basis for designin...

Страница 44: ...RESISTOMAT Model 2302 V001 Page 44 Introduction applications Description of functions Brief guide Operation Calibration Test and offset instructions RS232 data output Accessories and Circuit diagram...

Страница 45: ...n Test and offset instructions RS232 data output Introduction applications Description of functions Accessories and Circuit diagram Circuit diagram and Accessories Circuit digram Picture 6 Circuit dia...

Страница 46: ...n applications Description of functions Brief guide Operation Calibration Test and offset instructions RS232 data output Accessories and Circuit diagram Voltage amplifier Picture 7 Circuit diagram Vol...

Страница 47: ...e Operation Calibration Test and offset instructions RS232 data output Introduction applications Description of functions Accessories and Circuit diagram Picture 9 Assembly of Mother board Assembly of...

Страница 48: ...e Operation Calibration Test and offset instructions RS232 data output Accessories and Circuit diagram Picture 10 PCB of Voltage Amplifier Picture 11 PCB of Current source Messpunkte f r Nullstellung...

Страница 49: ...DKD 1240 Manufacturer Calibration Certificate Please refer to DKD Calibration Certificate but with reduced accuracy The traceability of the used secondary voltage and resistance standards to the natio...

Страница 50: ...1 5 m 60 A 30 mV 4 x 10 4 1240 0 001 1 m 0 05 3 m 30 A 30 mV 5 x 10 5 1240 0 002 2 m 0 05 3 m 30 A 60 mV 5 x 10 5 1240 0 005 5 m 0 05 4 m 20 A 100 mV 5 x 10 5 1240 0 01 10 m 0 03 3 m 14 A 140 mV 5 x...

Страница 51: ...ectrical conductivity respectively the resistance must be checked for compliance with specified values InconjunctionwithadigitalohmmeteroftheRESISTOMAT series theclamping devices are used in the cable...

Страница 52: ...l 2388 1 set interchangeable contacts for the potential tap model 2390 Connection cable for RESISTOMAT model 2304 05 model 2381 K003 2318 2319 2302 Connection cable for RESISTOMAT model 2329 model 238...

Страница 53: ...ainless steel and handles The outer contacting and inner potential tap points are insulated against each other The inner potential tap points are spring mounted Applications Particular attention is to...

Страница 54: ...o 1000 mm2 The opening angle of the tongs and the formofthecontactingprofilesalsopermitspecialapplications such as measurement on heavy duty transformers The fitted supply leads are 10 m long with ban...

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