Cropico DO5000 Series, User Manual

Page 1: ...INTERFACES FOR DO5000 SERIES DIGITAL MICROHMMETERS USER MANUAL Issue 7 0 1st October 2002 Cropico Pt No 610017 Ver 7 0 Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEqui...

Page 2: ...2000 Reflects new treatment of Temperature Compensated resistance in Version 5 0 software Also includes minor variations for the DO5001 and DO5002 models Issue 6 0 ECN 136 05 02 2001 Includes minor v...

Page 3: ...RS 232 Interface Commands 14 4 3 Configuration Measurement Commands 14 4 4 Data Operation Commands 17 4 5 Other function Commands 19 4 6 System Related Commands 21 4 7 Status Reporting Commands 22 4...

Page 4: ...t of pin assignments is given in Appendix II Signal levels MARK logical 1 3V to 15V SPACE logical 0 3V to 15V Data is transferred using the TXD and RXD lines Hardware handshaking for each character tr...

Page 5: ...er without the need for a PC Select ON to set the Talk Only mode In this mode the interface will ignore all incoming interface commands and the instrument will remain in LOCAL control mode The result...

Page 6: ...as the main display If the Temperature Compensation is selected then the compensated resistance will be sent See section 4 1 for output data format Addressable Mode On selecting Address Addr the curre...

Page 7: ...selective device clear DT1 Device Trigger Function The device may be triggered by the appropriate commands C0 Controller Function The controller function is not implemented and hence the instrument c...

Page 8: ...t This is used by one or more devices to indicate the need for attention and can act as an interruption of the current sequence of events Typically SRQ indicates data is ready to transmit and or an er...

Page 9: ...a pre defined device dependent state Recognising devices respond whether they are addressed or not The effect of DCL is as follows The parser is reset to await a new command The output queue is flushe...

Page 10: ...dent Messages This is known as Data Mode These messages are described fully in Section 4 3 7 Serial Poll A Serial Poll is a sequence which enables the controller to learn if a device or group of devic...

Page 11: ...ust not be sent as the first character This is treated as a non recognised character and the command error bit 5 of the Standard Event Register is set Semicolon The semicolon is also used to separate...

Page 12: ...is produced e g SENSe FRESistance RANGe 30OHM 300OHM ignored In the description of commands that follows various symbols are used for different features parameter represents a field name ON OFF the v...

Page 13: ...h engineering exponents reflecting the resolution and units displayed on the LCD screen e g Display Returned Value 30 321 30 321 30 range 29 657 K 29 657E 3 30K range 106 45 m 106 45E 3 200m range If...

Page 14: ...232 operation All keys on the front panel are fully functional This is the default at power up SYSTem REMote Places the instrument in the remote mode for RS 232 operation All keys on the front panel a...

Page 15: ...FAST Sets the measurement mode Slow mode produces approximately two readings per second gives the best noise immunity and all features are available Medium mode gives a 1 5x to 2x improvement in spee...

Page 16: ...ering is on then repeated FETCh commands can be made to return the most recent measurement One of three optional functions can be included with this command FRESistance Returns the uncompensated resis...

Page 17: ...LEAr Clears the datalog memory Take care all the current stored values will be lost DATAlogger COUNt No of readings Sets the maximum number of readings to be stored Valid range is 1 to 4000 DATAlogger...

Page 18: ...current contents of the data log A minimum of 2 readings must be stored otherwise an execution error is generated i e bit 4 of the Standard Event Register is set This error is also generated if the l...

Page 19: ...manually entered temperature the unit of which is the current temperature unit C or F Range is 0 100 C 32 212 F SENSe TCOMpensate MODE Returns EXT or MAN manual temperature SENSe TCOMpensate REFerenc...

Page 20: ...r for the measurement to be defined as settled SENSe SETTling LIMit Returns the maximum number of display digits selected Selecting the Settling facility will Deselect the Filter facility Change Avera...

Page 21: ...ime Use 24 hour clock format SYSTem TIME Queries the system clock time Returns hh mm ss in 24 hour clock format SYSTem DATE yyyy mm dd Set the system calendar date SYSTem DATE Queries the system calen...

Page 22: ...ad at any time using the appropriate query command The Event Register detects 0 to 1 transitions in the Condition Register and the appropriate bit is set The register value can be read at any time usi...

Page 23: ...sistance 0 Below Lower Limit Above Upper Limit 0 0 0 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 0 0 0 0 Measuring 0 0 0 Measurement 0 0 0 0 0 0 0 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Operation Complete 0...

Page 24: ...STATus QUEStionable EVENt Query the Questionable Data Event Register The instrument returns a binary weighted decimal value representing the bits set in the event register and clears it STATus QUEStio...

Page 25: ...uring bit 4 This bit is set when a new measurement starts and is cleared when complete Measurement Available bit 8 This bit is set when a new measurement started by the INITiate command has completed...

Page 26: ...synchronising data transfers from the instrument The application programme can poll the bit to detect when a measurement is complete and data is available Alternatively for IEEE the corresponding enab...

Page 27: ...ction with non query commands and is only available for IEEE If the OPC is sent in RS 232 mode it will generate a command error and the command is ignored Example Data logging can take an appreciable...

Page 28: ...an continuously poll the Message Available bit using STB The Status Byte Register can also be read by an IEEE 488 1 serial poll sequence 4 8 Front Panel Operations The currently selected interface is...

Page 29: ...c Controller or similar device The facilities it provides are Triggering of measurements Selection from 10 stored set up memories which are user programmable via the front panel See main Operation Man...

Page 30: ...0 mS Fast mode 240 mS 5 5 Description of Input Output signals Inputs COM IN Common line for all inputs CTRLIN Requests remote control of the microhmmeter and locks the keyboard When released control w...

Page 31: ...Remote Interface See Front Panel Set up When CTRLIN is asserted the Keyboard is locked If no Remote Interface is selected when CTRLIN is asserted then the PLC will be selected automatically If the RS...

Page 32: ...asurement 5 7 Analogue Output This is selected from the Remote Interface PLC menu see Front Panel Set up When fitted and selected ON it produces an output voltage proportional to the measured resistan...

Page 33: ...Memory 5 Test failed resistance too high Figure 2 Subsequent measurement using Memory 3 Test passed CTRLIN N0 MEASURE N1 N2 N3 CTRLOUT PASS FAIL HIGH FAIL LOW ERROR EOT CTRLIN N0 MEASURE N1 N2 N3 CTR...

Page 34: ...igure 3 Connecting the unit with the internal supply 25V CTRLIN 4 N0 17 N1 5 N2 18 N3 6 MEASURE 7 25V 3 0V 2 COM IN 16 COM OUT 8 CTRLOUT 21 EOT 22 PASS 10 FAIL HIGH 9 FAIL LOW 20 ERROR 23 DO5000 PLC S...

Page 35: ...ure 4 Connecting the unit with an external supply 25V CTRLIN 4 N0 17 N1 5 N2 18 N3 6 MEASURE 7 25V 3 0V 2 COM IN 16 COM OUT 8 CTRLOUT 21 EOT 22 PASS 10 FAIL HIGH 9 FAIL LOW 20 ERROR 23 25V PLC SYSTEM...

Page 36: ...ddress UNL Unlisten MTA My Talk Address UNT Untalk Programming Language Both interfaces use the same commands For the RS 232 interface these commands are sent as part of a serial string For the IEEE 4...

Page 37: ...it STATe ON OFF or 1 0 LIMit STATe LIMit ALARm ON OFF or 1 0 LIMit ALARm Temperature Compensation Commands SENSe TCOMpensate STATe ON OFF or 1 0 TCOMpensate STATe TCOMpensate MODE EXT or MAN manual te...

Page 38: ...em Related Commands DISPlay BRIGhtness ON OFF or 1 0 DISPlay BRIGhtness SYSTem BEEPer BEEPer STATe ON OFF or 1 0 BEEPer STATe VERSion TIME hh mm ss TIME DATE yyyy mm dd DATE IDN RST TST WAI Status Rep...

Page 39: ...39 RS 232 Interface Commands SYSTem LOCal REMote Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com...

Page 40: ...EE 488 Pin Connections 1 DIO1 Data Input Output 1 2 DIO2 Data Input Output 2 3 DIO3 Data Input Output 3 4 DIO4 Data Input Output 4 5 EOI End Or Identify 6 DAV Data Valid 7 NRFD Not Ready For Data 8 ND...

Page 41: ...5VDC 4 CTRLIN 5 N1 6 N3 7 MEASURE 8 COM OUT 9 FAIL HIGH 10 PASS 11 ANALOGUE OUTPUT LOW 12 CASE 13 No Connection 14 No Connection 15 No Connection 16 COM IN 17 N0 18 N2 19 Spare Input 20 FAIL LOW 21 CT...