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TC305/TC303 - Serial Communication

D - 1

1 GENERAL

The TC305/TC303 computer interface connector uses CMOS/TTL level signals.
No handshaking lines are used. Use Beamex RS1 or RS2 interface device to
connect TC305/TC303 to the computer serial port. These interface devices
convert the signals to the standard RS-232 level. RS1 computer interface makes
galvanic connection between TC305/TC303 and the computer. Do not use
TC305/TC303 for measurement or generation/simulation purposes, if it is
connected to the computer via RS1 interface. If the interface will be used during
measurement and/or generation, use the isolated RS2 interface.

Warning!

Never connect RS-232 level signals directly to the TC305/TC303 connector!
It may damage the TC305/TC303 internal circuits. Always use RS1 or RS2
interface device between TC305/TC303 and the computer.

Never connect TC305/TC303 to circuits that are in connection to ground if
TC305/TC303 is connected to the computer with unisolated interface device
(RS1)! Connection may cause ground loops, noise coupling or even circuit
damage.

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Summary of Contents for TC303

Page 1: ...he above not withstanding we can assume no responsibility for any errors in this manual or their eventual consequences We reserve rights to make modifications to this manual without any further notice For more detailed technical data about the Service manual for TC305 TC303 please contact the manufacturer Copyright 1997 OY BEAMEX AB P O Box 5 68601 Pietarsaari FINLAND Tel 358 6 7840111 Fax 358 6 7...

Page 2: ...5 Hardware troubleshooting B 6 3 5 1 Front assembly B 7 3 5 1 1 Display and keypad board B 7 3 5 1 2 Battery pack B 7 3 5 1 3 Power supply board B 8 3 5 2 Analog i o assembly B 9 3 5 3 Processor boards B 10 3 5 4 Optional 24V supply board B 10 PART C CALIBRATION 1 GENERAL C 1 2 EQUIPMENT REQUIRED FOR CALIBRATION C 1 3 PREPARATIONS BEFORE CALIBRATION C 3 4 SECTION B MEASUREMENTS C 4 5 SECTION A MEA...

Page 3: ...er display electrical unit selection D 8 3 2 2 A section temperature electrical mode selection D 8 3 2 3 Temperature sensor selection D 9 3 2 4 Temperature scale D 9 3 2 5 CJ selection D 10 3 2 6 Generation value setting D 10 3 2 7 Emulation of mechanical switch settings D 10 3 2 8 B section lower display electrical unit selection D 11 3 2 9 Local on off D 11 3 3 Calibration and service D 12 3 4 C...

Page 4: ...FUNCTIONAL DESCRIPTION ...

Page 5: ......

Page 6: ...re calibrator are divided in two sections The left side of the connection panel and the upper display constitute the Measure Generate section which is called the A section The right side of the connection panel and the lower display constitute the Measure section called here the B section ...

Page 7: ...n the TC305 TC303 output terminals The D A converter detects the measurement current coming from the external measurement device It controls the voltage across the resistance output terminals so that it is in the correct ratio to the detected current The microprocessor defines this ratio according to the Ohm s law and the simulated resistance value Theoretically the resistance simulation could be ...

Page 8: ...re are also circuits for switch state detection There is a galvanic isolation between the two sections This enables you to generate the input of an instrument and simultaneously measure the instrument output The B section microprocessor also carries out the communication with the user and with the computer via the serial computer interface ...

Page 9: ...SERVICE ...

Page 10: ...pt to start the Quick Store function with faulty configuration e g the instrument type is FREE SCAN ERROR The actuation or deactuation point of a limit switch out of the scan limits or scan limits out of the generation simulation range of the calibrator NOT SAVED Attempt to change the contents of the Working Memory without saving the results of the latest Quick Store to the Data Memory CANCEL STOR...

Page 11: ... TC303 calibrator NO CAL DATA This message is used in new devices before the initial definition and calibration It should not come in sold devices However if it comes there is fault in the EEPROM memory TC305 TC303 has lost all calibration data Do not use it for calibration purposes Send it to the manufacturer for repair NO DATA Attempt to use the Quick Examine function when the Working Memory is ...

Page 12: ... Software option data in EEPROM corrupted 10 According to A D converter readings the A section analog part is faulty The messages give some idea where the error might be You can t however make any absolutely sure conclusions of them Error codes 2 3 4 9 and 10 normally show that the error is in the analog i o assembly Error codes 6 and 7 mean that the main processor board is faulty Obvious cause fo...

Page 13: ...ing the calibrator The calibrator must be taken apart in case of software update read write memory installation battery replacement or hardware trouble shooting The following steps are required to disassemble TC305 TC303 Switch off the calibrator Loosen the four screws on the bottom of the calibrator Carefully lift the rear of the cover and remove the cover Remove the handle and the handle springs...

Page 14: ...tructions delivered with the new EPROM s 3 3 Installing software options To be able to install software options you must purchase the license for the option from us The license is delivered in form of security codes To be able to generate the codes we need the serial number of the calibrator as well as the serial number of the analog i o assembly of the calibrator To read the serial numbers select...

Page 15: ...ng Memory Data Memory and all configuration settings Calibration data as well as installation of software options do not change because they are stored in the non volatile EEPROM memory Setting of date time and all configurations is explained in part C of the instruction manual After disassembly TC305 TC303 may show error message ERROR CODE 7 If this happens switch the unit off for 5 seconds and t...

Page 16: ...s not in the recharging After sufficient recharge time disconnect the charger and after a few minutes measure the battery voltage See Instruction Manual part C Chapter 3 The reading should be about 100 If the value is too low check the charger and the power supply card If the batteries can be charged to full charge but the using time is considerably shortened the obvious reason is faulty battery p...

Page 17: ...ight too If your calibrator has the 24V supply option measure the 24V supply output If it is right you can be quite sure that the other voltages are right too A B 15V C F 5V G 25 5V The calibrator sections A and B should be galvanically isolated from each other To check this switch the calibrator off and measure the DC resistance between the CJ block minus terminal and the section B black terminal...

Page 18: ... to the same as marked on the connection panel To check the stored serial number of the calibrator as well as the serial number of the analog i o assembly installed in the calibrator select the configuration menu entry CONF OTHERS quick select qCONF qSTO To the prompt C CODE enter the code 101 ENT For example the display C 330 E 10234 means that the serial number of the calibrator is 330 and the s...

Page 19: ...t may be result of an extremely strong interference from other electrical circuits or devices If the fault repeats often the faulty processor board must be replaced If you can t switch the calibrator off loosen one of the battery wires from the power supply board and loosen the battery charger from the calibrator When you reconnect the battery wire you should be able to switch the calibrator on ag...

Page 20: ...CALIBRATION ...

Page 21: ...f TC305 TC303 temperature calibrator you need the following equipment 1 DC calibrator capable to generate the voltages and currents in the following table with the stated accuracy 2 DC meter capable to measure the generated voltages in the calibration of the resistance simulation 3 Four precision resistors resistances and accuracies as stated in the following table 4 A good quality thermocouple of...

Page 22: ...for calibration of resistance simulation Resistance measuring device measurement current 1 mA 10 accuracy 0 to 400 ohm better than 15 mohm accuracy 400 to 4000 ohm better than 150 mohm or Current source 0 9 to 1 1 mA known with uncertainty 30 nA and voltage measuring device 0 to 5 V Rin 10 GΩ accuracy better than 0 001 of reading The stated accuracies for the necessary equipment are about three ti...

Page 23: ...ssure the best accuracy There should be at least 50 of the battery capacity left in the TC305 TC303 Disconnect the charger at least one hour before the calibration Switch the calibrator on about one hour before starting the calibration Whenever you change the test wiring wait a couple of minutes allowing the temperature to stabilize Otherwise there may be extra thermovoltages in the wiring worseni...

Page 24: ...e required measurement mV V mA with the up arrow key key SEL 9 is numeric in this mode 2 Connect the required calibration signal to the selected terminals 3 Key in the correct value of the calibration signal and press qENT when the measured value has been stable for more than 10 seconds If there were not at least 21 successive readings within certain limits before you pressed qENT TC305 TC303 flas...

Page 25: ...f one of the points in the table above If the measured value differs too much from the entered value TC305 TC303 only flashes the error message CAL ERROR without altering the calibration Check that the connected signal is correct and try again The calculated calibration factors are now stored temporarily only If you want to save them permanently press the key qSTO and to the prompt ENT SAVE press ...

Page 26: ...ith the up arrow key key SEL 8 is numeric in this mode 2 Connect the required calibration signal to the selected terminals Use 4 wire connection with resistors 3 Key in the correct value of the calibration signal or resistance and press qENT when the measured value has been stable for more than 10 seconds If there were not at least 21 successive readings within certain limits before you pressed qE...

Page 27: ... a new value so that it fits within the limits of one of the points in the table above If the measured value differs too much from the entered value TC305 TC303 only flashes the error message CAL ERROR without altering the calibration Check that the connected signal is correct and try again The calculated calibration factors are now stored temporarily only If you want to save them permanently pres...

Page 28: ... an extra 3 and finally press qENT For instance to the device with s n 780 key 7803 ENT For measurement of the simulated resistance use a resistance measurement equipment with measurement current 1 mA 10 Use four wire connection between the measuring equipment and TC305 TC303 two leftmost ohm terminals Alternatively you can use separate equipment for current sourcing and voltage measurement In tha...

Page 29: ...if the 400 ohm point needs to be calibrated it should be done first If the entered true value of the measured resistance differs too much from the one calculated by TC305 TC303 TC305 TC303 only flashes the error message CAL ERROR without altering the calibration Check the wiring and the measured calculated resistance and enter the right value The calculated calibration factors are now stored tempo...

Page 30: ...ration as explained either in Chapter 7 1 or in Chapter 7 2 If the measured value differs too much from the entered value TC305 TC303 only flashes the error message CAL ERROR without altering the calibration Check the measurement and try again The calculated calibration factor is now stored temporarily only If you want to save it permanently press the key qSTO and to the prompt ENT SAVE press the ...

Page 31: ...OR 7 is numeric in this mode The upper display shows now the measured calibration bath temperature in default temperature units The lower display prompts REF Key in the correct temperature wait until the measurement has been stable over 25 seconds and press qENT If you know the error of the thermocouple in this measurement you should take it into account Example The measured temperature is 0 C and...

Page 32: ...perature in the TC305 TC303 thermocouple connector block to settle at least half an hour before the calibration Select the thermocouple type B with the up arrow key key SENSOR 7 is numeric in this mode Selecting type B is used as a flag telling to TC305 TC303 that you want to calibrate with a thermometer instead of a thermocouple The upper display shows now the internal temperature of the TC305 TC...

Page 33: ...ate To change the calibration date for the A section select the calibration of A section measurements resistance simulation or internal reference junction Escape from the prompt REF by pressing the key qSTO and to the prompt ENT SAVE press the key qENT To change the calibration date for the B section select the calibration of B section measurements and proceed as explained above Switch the calibra...

Page 34: ...g and shorten the settling time Carry out this whenever you have recalibrated the A section measurements TC305 TC303 wants to be sure that the mA generation terminals are short circuited and the other terminals are open Check the connections and press qENT to the prompt mA LOOP ENT GO TC305 TC303 checks the mA loop In case of fault it exits flashing the message CAL ERROR During the auto calibratio...

Page 35: ...eying in the new value and pressing qENT Pressing qESC escapes without altering the previous setting TC305 TC303 checks the date of the next calibration when you switch it on After the recommended calibration date it shows the message CALIBR SOON every time you switch it on You can use TC305 TC303 normally in spite of the message if you press qESC To assure the accuracy however you should recalibr...

Page 36: ...SERIAL COMMUNICATION ...

Page 37: ... measurement or generation simulation purposes if it is connected to the computer via RS1 interface If the interface will be used during measurement and or generation use the isolated RS2 interface Warning Never connect RS 232 level signals directly to the TC305 TC303 connector It may damage the TC305 TC303 internal circuits Always use RS1 or RS2 interface device between TC305 TC303 and the comput...

Page 38: ...5 TC303 sends an XON to the host While TC305 TC303 has only 75 bytes free in the receive buffer when it sends XOFF the host should immediately process the XOFF character and stop sending i e the XON XOFF processing should be low level coded We recommend the use of ASYNCH MANAGER Pascal or C ASYNCH MANAGER C or C language both available from BLAISE COMPUTING INC 2 2 Checksum The checksum consists o...

Page 39: ...5 TC303 will resend the last message whereas ACK allows TC305 TC303 to send next message That is if checksum is invalid send NAK if checksum is correct send ACK 2 4 Line terminators CR LF The terminator s sent by TC305 TC303 can be selected with the Y command There are four alternatives for more details see Y and S commands Command Answer Y0S Status 0000 Ok cr lf Y1S Status 0000 Ok lf cr Y2S Statu...

Page 40: ... line terminator is received i e the command line is truncated to 180 characters Note that special commands require to be alone on the command line and cannot be mixed with the ordinary commands u0l0c1x2 cr Ok x0RESET305 Invalid x0 is performed successfully but then TC305 TC303 does not recognize RESET305 as a special command while the special commands need to be alone on the command line I e TC30...

Page 41: ...and without checksum and acknowledgement to find the present mode In checksum mode you can replace the checksum with XX as explained in chapter 4 C0 No checksum no acknowledgement C1 Send checksum C2 Receive checksum C3 Send and receive checksum C4 Send checksum receive acknowledgement C5 Receive checksum send acknowledgement C6 Send and receive checksum and acknowledgement 3 1 2 Line termination ...

Page 42: ...hat the display mode settings have no effect on the readings sent to the computer interface these readings are always in engineering units See Appendix B for more information about the printout format 3 1 4 Use of status codes S Status request After sending the present status TC305 TC303 clears the status S0 Never automatically send status S1 Automatically send status on command error S2 Always se...

Page 43: ...s overflow indicator O01 Use abnormal reading 10000 10000 as overflow indicator 10001 for CJ open O02 Pad with spaces on overflow Justify options Example O10 Right justify 12 34 O11 Left justify 12 34 Sign options Example O20 No space on sign place nor plus if positive 12 34 O21 No plus if positive 12 34 O22 Always use sign 12 34 Options apply to positive numbers option 20 applies only if option 1...

Page 44: ...onfiguration 3 2 1 A section upper display electrical unit selection U0 mV U1 V U2 mA U3 Ohm 3 2 2 A section temperature electrical mode selection F0 Electrical mode F1 Temperature mode Celsius F2 Temperature mode Fahrenheit F3 Temperature mode Kelvin ...

Page 45: ...e sensor T03 K type sensor T04 N type sensor T05 R type sensor T06 S type sensor T07 T type sensor RTD T08 Pt100 sensor Special sensors T09 Special sensor S1 T10 Special sensor S2 T11 Special sensor S3 The required electrical unit mA mV V or ohm must be set before setting the sensor type 3 2 4 Temperature scale I0 IPTS 68 I1 ITS90 ...

Page 46: ...ue setting Vxxx xxxx NOTE The generated value is always in engineering units 3 2 7 Emulation of mechanical switch settings W00 Supply for mA generation EXTERNAL W01 Supply for mA generation INTERNAL W10 measure generate GENERATE W11 measure generate MEASURE NOTE The W commands require Local OFF status Z1 command When the calibrator is put back to Local ON state the switch modes will change back to...

Page 47: ...lay electrical unit selection L0 mV L1 V L2 mA L3 Switch 3 2 9 Local on off Z0 Enable keypad and switches local on Keypad and switches are automatically enabled when TC305 TC303 is switched on Z1 Disable keyboard local off All keys except LIGHT and OFF are disabled ...

Page 48: ...bration date will be saved A2 Calibration of B section measurements A3 Calibration of A section measurements A4 Calibration of ohm simulation G0 Select 400 ohm calibration point G1 Select 10 ohm calibration point using lower gain in the amplifier G2 Select 10 ohm calibration point using higher gain in the amplifier G3 Select 4000 ohm calibration point A5 Calibration of internal reference junction ...

Page 49: ...e key is for instance SENSOR 7 the answer is Key 00 If no key was pressed the answer is No key K00 Emulate SENSOR 7 K01 Emulate SEL 8 K02 Emulate SEL 9 K03 Emulate ESC OUT K04 Emulate LIGHT ON K05 Emulate T EL 4 K06 Emulate MODE 5 K07 Emulate MODE 6 K08 Emulate STO K09 Emulate UP K10 Emulate C F 1 K11 Emulate 100 2 K12 Emulate 100 3 K13 Emulate RCL K14 Emulate DOWN K15 Emulate CJ 0 K16 Emulate 0 K...

Page 50: ...nd calibrator analog board serial numbers X1 Send B section CPU software version number X2 Send A section CPU software version number X3 Send communications interface software version number X4 Send version comment 3 5 2 Set get date D Send date Dddmmyyyyhhmmss Set date day month year hour minute second ...

Page 51: ...d until a key is pressed valid time 0 1 1000 0 seconds Examples E Abcd Shows the message Abcd on the TC305 TC303 upper display until a key is pressed EBC Error 2 Clears the displays and blinks Error on the upper display for two seconds EC2 UP EB7 Down Shows UP on the upper display and blinks Down on the lower display until a key is pressed If displays are reserved for some important purpose for ex...

Page 52: ...e serial interface parameters CAL305 Enable calibration When CAL305 is received by the calibrator it will send Calibrate Yes To enable calibration the next command received must be Yes On reception the calibrator will answer Calibration enabled I e to enable calibration send CAL305 cr Yes cr to the calibrator Warning Improper use of calibration commands may affect the precision of TC305 TC303 Do n...

Page 53: ...APPENDIXES ...

Page 54: ...ue VALUE CAN NOT 11 0400h Bad calibration temperature CALIBR RANGES 12 0800h Calibration ranges differ DIFFER RS ERR 13 1000h Busy can not do command right now retry CODE13 RS ERR 14 2000h Checksum error CODE14 RS ERR 15 4000h Buffer overflow CODE15 RS ERR 16 8000h Framing or overrun error CODE16 Normally the error code is shown on the calibrator display Error codes 8 12 are however replaced with ...

Page 55: ...racters _ Note that the mode settings do not affect the upper nor the lower display readings their representation remains in engineering units Some positions are not currently used they are reserved for future expansion and they currently contain spaces Examples of printout M_____ 4 478mV____ 4 605mV______________N__ M_____ 0 001mA____ 4 385mV_________________ M____Hi_Ofl_C_____ 0 019mA_____B___25...

Page 56: ...V_ V__ mA_ ohm 17 Switch state on the lower display o open c closed _ n a 18 25 Lower display engineering mode reading formatted according to options set with O command 26 28 Lower display unit mV_ V__ mA_ SWI switch 29 32 ____ future expansion 33 34 Temperature sensor type B_ E_ J_ K_ N_ R_ S_ T_ Pt S1 S2 S3 __ n a 35 41 Reference junction temperature formatted according to options set with O com...

Page 57: ...A XOR 255 AND 255 REM 1 s complement and mask 8 bits 80 S S HEX INT A 16 REM Add checksum first character 90 S S HEX A MOD 16 REM Add checksum second character APPENDIX D TC305 TC303 RS 232 SAVEABLE OPTIONS The following options may be saved restored along with the other options Acknowledgment w checksum Output formatting Automatic send interval Status message send and Line terminator options Like...

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