TMX32 User's Manual
Contents
1. 3 10 Grounding the Negative Input Differential Inputs 3 10 Other Noise Reduction Techniques 3 10 APPENDIX TMX32 SPECIFICATIONS 20 2020000002002002002000200200n00n000200000000n0000000000 00000000000 0000 A 1 APPENDIX B TMX32 50 PIN CONNECTOR PINOUT B 1 APPENDIX MX32 CONFIGURATION C 1 APPENDIX D WARRANTY asada D 1 il 1 1 1 2 1 3 1 5 1 6 1 7 1 8 1 9 2 1 2 2 2 3 2 4 2 5 3 1 3 2 3 3 3 4 3 5 3 6 List of Illustrations Board Layout Showing Factory Configured Settings 1 3 Channel Select Jumpers 8 Channel A D 1 4 Connecting Channel 1 to 16 Channel A D Board eese nennen 1 5 Connecting Channel 9 to 16 Channel A D Board sees nee 1 5 Gain Select Jumpers te Eb IN EREMO eR eb line 1 6 Temperature Sensor Voltage Output Select Jumpers P6 1 6 Offset Adjustment Source Select Jumper P7 1 7 Power Source Select Jumper ine tte id 1 7 Single Ended Differential Jumper 9 1 7 PT VO Connector Pin Assignments 5 n nate rt te RERO ERR E Inn 2 3 Board Layout TBI TB2 and pt ee tenter e EROR in Pee RET GA eed ee Rn 2 4 Single Ended Input Connections 2 5 Differential Input Connections Without Ground R2. e fe sorti fe 11000 ETA A Chamnels 17 32 in single ended mode only Temperature Sensing Circuity for Thermocouple Cold Junction Compensation The TMX32 has an on board temperature sensor which provides an output voltage representing the board s ambient temperature that can be routed to channel 8 or 16 on the A D converter board for use in cold junction compensation and linearization through software of thermocouple measurements Up to two cold junction com pensation channels are supported by the TMX32 regardless of how many TMX32 boards are daisy chained If you require more channels for thermocouples it is recommended that you use a TS16 Thermocouple Sensor Board which accepts up to 16 J or type thermocouples and can be used in a system with the 32 To then estimate the temperature when the thermocouple output voltage is known the following polynomial can be used T a a V a V V Where T temperature in C V the thermocouple output voltage in millivolts and a the constants from the table below 3 5 Copper Chromel Iron Chromel Platinum Constantan Constantan Constantan Alumel Pt 10 Rh Type T Type E Type J TypeK TypeS a 0 100860910 0 104967248 0 048868252 0 226584602 0 927763167 a 25727 94369 17189 45282 19873 14503 24152 10900 169526 5150 a 767345 8295 282639 0850 218614 5353 67233 42488 31568363 94 a 78025595 81 12695339 5 11569
3. Table 1 1 Factory Settings Jumper Switch Function Controlled Factory Setting Select the channel that the TMX32 is connected to on the A D converter board One or two jumpers must be installed as explained later in this P3 Channel 1 P3 P4 chapter P4 Channel 1 GND Sets the TMX32 board gain this gain is multiplied by the gain setting of Jumpers installed on GO the A D converter board to determine the overall channel gain and G1 gain 1 Feeds the temperature sensor s voltage output into channel 8 or 16 on the Jumpers installed on A D board to enable cold junction compensation through software DIS disabled Connects the 2 power to the internal power supplied from A D Connected to internal board or external power supplied by user power Sets the analog input signal type for S single ended or D differential Single ended P3 and P4 A D Converter Board Channel Select Factory Setting Channel 1 GND Selects the TMX32 amplifier offset adjustment source The TMX32 expands a single channel on your A D converter board to either 32 single ended or 16 differential analog input channels P3 and P4 are used to select which analog input channel on your A D converter board you connect to the TMX32 These connectors accommodate A D converter boards with up to 16 channels For 1 8 Input Channels single ended or differential on A D board When you connect the TMX32 to an A D converter board with eight or fewer analog i
4. ABOVE LIMITATIONS OR EXCLU SIONS MAY NOT APPLY TO YOU THIS WARRANTY GIVES YOU SPECIFIC LEGAL RIGHTS AND YOU MAY ALSO HAVE OTHER RIGHTS WHICH VARY FROM STATE TO STATE D 3 D 4
5. Setting Internal 1 7 P9 Single Ended Differential Analog Inputs Factory Setting Single Ended 1 7 CHAPTER 2 BOARD CONNECTIONS nee UN ERE FU uan 2 1 Connecting to the A D Converter 2 3 Connecting to 50 pin A D Converter 2 3 Connecting to the Signal Sources 2 4 Connecting Single Ended Analog Inputs 2 4 Connecting Differential Analog Inputs 2 5 CHAPTER 3 BOARD OPERA TION 22 2 sen 3 1 Multiplexing CIrCUItEy 4r rere ete eer nt rH EP E eie ete AR Ped bre ids 3 3 Input Voltage en Reed ito he e te e m ge es 3 3 P 3 3 Offset Voltage Adjustment 3 4 Digital Control Mes iu tn meme eir er hie proie ong 3 4 Temperature Sensing Circuity for Thermocouple Cold Junction Compensation sse 3 5 Reducing the Noise on Your Analog 3 8 Input Signal Conditioning contenderet eee sire esse Es nalen stehe 3 8 Low Pass Filter Single Ended Inputs 3 8 Low Pass Filter Differential Inputs ener en en nest nente nennen 3 9 Attenuator Smegle Ended Inputs ee eee ie ee in lu 3 10 Current Shunt Differential Inputs
6. a 16 Channel A D Board nels 1 through 8 the rightmost row of pins on P3 provides the common signal for all 16 channels and the leftmost row of pins on P4 carries the analog input signal for channels 9 through 16 The rightmost row of pins on P4 is connected to ground and is not used when connecting to a 16 channel A D converter board 5 Select Factory Setting GO and G1 Installed Gain 1 P5 shown in Figure 1 5 lets you select one of four gain settings 1 10 100 or 1000 or set the gain through software The two pins GO and Gl are used to set the gain for all TMX32 channels to one of the four values above The table below shows you how to install the jumpers to achieve the desired gain ON jumper installed OFF jumper removed P5 G1 G0 SPG Fig 1 5 Gain Select Jumpers P5 The two pins labeled SPG are used to allow control of the gain setting through software For software programmable gain install the jumpers across both pairs of SPG pins When the jumpers are installed across these pins bits 5 and 6 of the digital control word written to the TMX32 from the A D converter board are used to program the gain Note that the gain set on the TM X32 board is multiplied by the gain setting of your A D converter board to determine the overall channel gain P6 Temperature Sensor Voltage Output Select Factory Setting Disabled P6 shown in Figure 1 6 lets you select to which channel on the A D board th
7. affect readings should the offset not be zeroed To adjust the offset when the P7 jumper is installed across the pins short the inputs to channel 1 together and observing the channel 1 output adjust the appropriate trimpot until a value equal to O volts is read Also note that when you are using the TMX32 in a system that is set for a high gain 100 or more the analog inputs may carry a significant amount of noise To help lower the noise levels you can reduce the gain or use some of the techniques described in the noise reduction discussion in this chapter Digital Control Lines Five digital control lines DINO through DIN4 or DOUTO through DOUT4 when looking at the signals output from the A D converter board let you select which TMX32 channel is active These lines are programmed from the A D converter board and must be set up as outputs on that board The TMX32 cannot be controlled by analog lines If your board has an 8255 PPI chip then you must set up the lines that you use for TMX32 channel and gain selection as mode 0 outputs The A D converter board manual tells you how to set up the PPI Table 3 1 shows the 5 bit digital data and their corresponding channel selections Note that when operating in the differential mode only the first 16 entries are valid In the differential mode the MSB of the 5 bit data must always be 0 3 4 Table 3 1 Analog Input Channel Select DINO DIN4 Channel 54321 Channel 54321 MEN ee
8. used by the TMX32 board labeled The TMX32 is pin for pin compatible with Real Time Devices 50 pin I O connector DAS boards These include DataMaster boards AIC boards Precision Integrating boards and dataModules The unlabeled pins on the TMX32 carry the same signal found at the I O connector of the DAS board or module you are using If you want to access other signals on your A D converter board such as digital I O or timer counters you can connect to the 16 signals available on TB3 at the top of the TMX32 board shown in Figure 2 2 This terminal strip is labeled with the pin numbers brought out to it from P1 To find the signals available on these pins refer to the A D converter board s pinout in the board manual To further expand your input channel capability by adding more TMX32 boards you can use the daisy chain connector on the TMX32 board P2 The signals at this connector are identical to the pinout of your 50 pin A D converter board You can connect to another TMX32 board or to a TB50 or XB50 breakout board to easily access all of the digital I O and timer counter signals Our technical staff is available to help you select the accessories you need for your application WARNING If you connect more than one TMX32 board to an A D converter board be sure that you select a different A D converter board channel for each TMX32 board used header connectors and P4 on TMX32 If you connect more than one TMX32 to the
9. 199 78 2210340 682 8990730663 a 9247486589 448703084 6 264917531 4 860963914 9 1 63565x10 a 6 97688 10 1 10866x10 2018441314 4 83506 10 1 88027x10 2 66192 1013 1 76807 10 1 18452x10 1 37241x10 6 3 94078x10 1 71842x10 1 38690 1013 6 17501x10 a 9 19278 1013 6 33708 1013 1 56105x10 a 2 06132 1013 6 33708 1013 1 69535 1020 To convert the output cold junction voltage measured the TMX32 s temperature sensor to the cold junction temperature in degrees Centigrade use the following formula Cold Junction Voltage 10mV Cold Junction Temperature C After finding the thermocouple temperature and the cold junction temperature in degrees Centigrade add the thermocouple temperature to the cold junction temperature to determine the true temperature being measured Table 3 2 on the next page shows the ideal output voltages for some common thermocouples at selected temperatures 3 6 Table 3 2 Output Voltage vs Temperature in mV for Common Thermocouples Copper Chromel Iron Platinum Temperature Constantan Constantan Constantan En Pt Nr 0 gt iC Type T Type E T J ee IE RI EE o 5889 o 5603 780 58 aso s 823 742 550 60 7631 68 sim Am 6907 amp 4669 ao as 6107 5 4138 3378 5237 462 353 o 2788 4301 3785 290 60 215 336 28
10. 2 223 40 asm aso 527 20 as 095 o 000 000 000 000 000 a 249 2 161 0232 247 368 315 24 038 se 3357 498 o 9286 1349 1077 8137 1468 o m 17178 13553 10151 30 14860 21093 1635 1227 240 17816 24961 1422 28 _ 2089 2893 2186 16395 3407 40 2 267 18513 393 50 sw 2738 2060 44 ___ s 3306 2492 552 50 eso 28128 em sao s 799 o gases 928 390 S 1058 wo 48 6 ee tes 538 Reducing the Noise on Your Analog Inputs Because the TMX32 board is used externally and can be positioned almost anywhere in your data acquisition environment it is susceptible to noise coupling Therefore you may want to use some noise reduction techniques to ensure accurate conversion results Note that for very low voltage measurements it is recommended that you place the TMX32 as close to the sensor as possible Input Signal Conditioning The TMX32 has a series of resistor and capacitor pads on the printed circuit board for each analog input You can install custom conditioning circuitry such as low pass filters attenuators current shunts and other circuitry in these pads This section shows you
11. T MAIN CONNECTOR e o E o u z z o o z lt 5 gt o lt a GAIN CONTROL DOUT5 DOUT6 AOUT2 MUX CONTROL DOUTO DOUTA 5 DC DC 15 V CONVERTER Fig 3 1 TMX32 Block Diagram Multiplexing Circuitry The TMX32 uses two 16 input analog multiplexers to provide a single output which is fed to the selected input channel an A D converter board Each multiplexer has 35 Vdc overvoltage protection to protect it against accidental signal overloads Input Voltage Range The input voltage range of the TMX32 is determined by the range of the A D converter board If the A D board is set for a 5 volt range then all of the TM X32 board inputs must fall within the range of 5 volts before being sent to the A D board Gain You can set a jumper selectable gains of 1 10 100 or 1000 or you can configure the TM X32 to program the gain through software for applications where the input voltage varies widely because of different sensor types on different channels Chapter 1 describes how to set the gain jumpers for either gain configuration Digital lines DINS and DING control the gain setting when in the software selectable mode These lines are programmed through the A D converter board and must be set up on that board as digital output lines and as mode 0 if your A D board has an 8255 PPI chip The A D converter board s manual tells you how to set up the PPI The following table shows the states of thes
12. TMX32 User s Manual Real Time Devices Inc LEE _ _ Accessing the Analog World Publication No TMX32 9630 TMX32 User s Manual REAL TIME DEVICES Post Office Box 906 State College Pennsylvania 16804 Phone 814 234 8087 FAX 814 234 5218 Published by Real Time Devices Inc P O Box 906 State College PA 16804 Copyright 1996 by Real Time Devices Inc All rights reserved Printed in U S A 9630 Table of Contents INTRODUCTION s 1 1 MS 1 3 Thermocouple Compensation e dI dile a ee ru ene Hg soiree Ebo Eng i 3 MX32 Compatibility inert p Dese pn e ten ce i 3 What Comes With Your Board sidonia et hem i 3 Using This Manual o tee eerte ee Dei dee Ete b Gne e eer 1 4 When You Need Help ess 1 4 CHAPTER 1 BOARD SETTINGS 2 1 1 Factory Configured Switch and Jumper Settings 1 3 and A D Converter Board Channel Select Factory Setting Channel 1 GND 1 4 P5 Gain Select Factory Setting GO and G1 Installed Gain 1 sse 1 6 Temperature Sensor Voltage Output Select Factory Setting Disabled esses 1 6 P7 Offset Adjustment Source Select Factory Setting TMX32 TRI Offset Adjust 1 7 P8 Power Source Select Factory
13. TY DOES NOT EXTEND TO ANY PRODUCTS WHICH HAVE BEEN DAM AGED AS A RESULT OF ACCIDENT MISUSE ABUSE such as use of incorrect input voltages improper or insufficient ventilation failure to follow the operating instructions that are provided by REAL TIME DEVICES acts of God or other contingencies beyond the control of REAL TIME DEVICES OR AS A RESULT OF SERVICE OR MODIFICATION BY ANYONE OTHER THAN REAL TIME DEVICES EXCEPT AS EX PRESSLY SET FORTH ABOVE NO OTHER WARRANTIES ARE EXPRESSED OR IMPLIED INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE AND REAL TIME DEVICES EXPRESSLY DISCLAIMS ALL WARRANTIES NOT STATED HEREIN ALL IMPLIED WARRANTIES INCLUDING IMPLIED WARRANTIES FOR MECHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE LIMITED TO THE DURATION OF THIS WARRANTY IN THE EVENT THE PRODUCT IS NOT FREE FROM DEFECTS AS WARRANTED ABOVE THE PURCHASER S SOLE REMEDY SHALL BE REPAIR OR REPLACEMENT AS PROVIDED ABOVE UNDER NO CIRCUMSTANCES WILL REAL TIME DEVICES BE LIABLE TO THE PURCHASER OR ANY USER FOR ANY DAMAGES INCLUDING ANY INCIDENTAL OR CONSEQUENTIAL DAM AGES EXPENSES LOST PROFITS LOST SAVINGS OR OTHER DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE PRODUCT SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSE QUENTIAL DAMAGES FOR CONSUMER PRODUCTS AND SOME STATES DO NOT ALLOW LIMITA TIONS ON HOW LONG AN IMPLIED WARRANTY LASTS SO THE
14. cations Gain Amplifier The gain amplifier is changed from a 1 10 100 or 1000 amplifier to a 1 2 4 and 8 gain amplifier The settings for the gains and corresponding jumpers on P5 GO and G1 are shown in the table below When the jumpers on P5 are placed across SPG pins the gains can be programmed on and DING as shown in the table below Programmable Gain Digital Lines Gain DIN6 DIN5 1 0 0 2 0 1 4 1 0 8 1 1 Offset Voltage Circuitry The offset voltage circuitry using the on board trimpot TRI or the output of or DAC2 as described in this manual is active on the MX32 configured board C 3 C 4 APPENDIX D WARRANTY D 2 LIMITED WARRANTY Real Time Devices Inc warrants the hardware and software products it manufactures and produces to be free from defects in materials and workmanship for one year following the date of shipment from REAL TIME DE VICES This warranty is limited to the original purchaser of product and is not transferable During the one year warranty period REAL TIME DEVICES will repair or replace at its option any defective products or parts at no additional charge provided that the product is returned shipping prepaid to REAL TIME DEVICES All replaced parts and products become the property of REAL TIME DEVICES Before returning any product for repair customers are required to contact the factory for an RMA number THIS LIMITED WARRAN
15. ce does not have a separate ground reference you must ground the IN input through a 10 kilohm resistor Figure 3 6 shows you how to build this circuit The table included in Figure 3 6 shows you where to install Ra on the board for each channel Other Noise Reduction Techniques Some more tips on noise reduction When connecting to an A D converter board with differential capability set the board up for differential operation on your TMX32 channel even if you are using the TMX32 in the single ended mode nstall filters Average the readings you take in software Channel Ra 1 ann Ra 250 AIN a fron Formula Vout Input Current x 2501 Example Input Current 13 mA 3 2 Fig 3 5 Differential Current Shunt Channel Ra 1 R33 2 R34 AIN gt _ gt 3 R35 4 R36 AIN 5 R37 6 R38 Ra 7 R39 10K 8 R40 9 R41 10 R42 11 R43 12 R44 13 R45 14 R46 15 R47 16 R48 Fig 3 6 Differential IN Grounding APPENDIX TMX32 SPECIFICATIONS 2 TMX32 Characteristics Typical E 25 C Multiplexer eure HI506 Number of channels 32 single ended 16 differential Input impedance Ara 10 Gains software selectable 1 10 100 1000 Gain error lt 1000 0 05 typ 0 25 max Gain err
16. e lines for each gain setting 3 3 Programmable Gain Digital Lines Offset Voltage Adjustment Trimpots TRS x1 TR4 x10 TR3 x100 and TR2 x1000 are provided on the TMX32 to adjust the offset voltage for each gain These offsets have been calibrated at the factory and should not need to be changed To compensate for sensors with an inherent offset that you want to eliminate You can use a D A output from your A D converter board to provide the offset voltage adjustment The output from the A D converter board s or DAC2 can be used simply by placing the jumper on the TMX32 s P7 header across the pins labeled 1 DACI or 2 DAC2 When a jumper is installed in either of these locations then whatever voltage is fed out the corresponding DAC output from the A D converter board becomes the offset voltage In this way you can change the offset on a channel by channel and gain by gain basis For example if a sensor has an inherent offset of 2 volts but changes only in millivolts around the 2 volt value you can send a value of 2 volts out the DAC to center the millivolt readings around zero and allow you to use gain to amplify the signal Note that offsets which may be insignificant at low gains could become a factor when you further increase the gain through the A D converter board For example gain of 10 on the TMX32 coupled with a gain of 16 on your converter board provides a total gain of 160 large enough to substantially
17. e temperature sensor s voltage is routed When both jumpers are installed across the left pins as shown in Figure 1 6a the temperature sensor s voltage is fed nowhere disabled When a jumper is installed across pins 8 and T as shown in Figure 1 6b the voltage is fed into channel 8 on the A D board When a jumper is installed across pins T and 16 as shown in Figure 1 6c the voltage is fed into channel 16 on the A D board When the A D board is being operated in the DIFFERENTIAL mode then two jumpers must be installed one across 8 and T and one across 16 and G Chapter 3 provides more information about the temperature sensing circuit P6 P6 P6 P6 8 8 8 8 T T T T 16 16 16 16 G G G G DIS Fig 1 6a Disabled Fig 1 6b Temperature Fig 1 6c Temperature Fig 1 6a Temperature Factory Setting Sensor to Channel 8 A D Sensor to Channel 16 A D Sensor to Channel 8 A D A D DIFFERENTIAL Mode Fig 1 6 Temperature Sensor Voltage Output Select Jumpers P6 7 Offset Adjustment Source Select Factory Setting TMX32 TR1 Offset Adjust P7 shown in Figure 1 7 lets you select the offset adjustment source for the TMX32 amplifier When the jumper is placed across the pins labeled G the offset is controlled only by trim pots on the TMX32 board When the jumper is placed across 1 or 2 the offset adjustment source is the voltage output of labeled 1 or DAC2 labeled 2 on the A D board as well as by the trim pots Chapter 3 explai
18. eference 2 6 Differential Input Connections With Ground Reference 2 7 TMX32 Block Diagram x 1 rte et e E i er RER 3 3 Single Ended I ow Pass Filtermg RT Rp seinen 3 9 Differential Low Pass Filtering 3 9 Single Ended Atten ator 5 i eee unen eui t ee EO Banks 3 10 Differential Current Shu nft 3 11 Differential IN Grounding ee eere BER e DE 3 11 iii iv INTRODUCTION The TMX32 analog input expansion board with thermocouple compensation economically expands the input capability of any channel on your A D converter board to 32 single ended or 16 differential channels The TMX32 is especially well suited for applications where a thermocouple sensor is monitored with other sensor types When you have several thermocouples we recommended that you use the TS16 temperature sensor and input expansion board for the thermocouple measurements The TMX32 external interface board features 32 single ended or 16 differential analog input channels 100 kHz throughput On board temperature sensor cold junction compensation for thermocouples through software Shunt terminals for current measurement Jumper selectable gains of 1 10 100 or 1000 1 2 4 amp 8 optional or software programmable gain Circuit pads to install resistors and capacitors for input signal conditioning 35V overvoltage protection 10V common mode input voltage Connector for exter
19. ence 2 6 If your signal source HAS a ground reference signal Refer to Figure 2 5 and connect the high side of the analog input to the selected analog input channel IN1 through IN16 and connect the low side of the input to the corresponding IN pin Then connect the ground from the signal source to one of the GND terminals When a signal source has a reference ground no resistors are necessary MUX TERMINAL BLOCK SIGNAL SOURCE 1 our SIGNAL Fig 2 5 Differential Input Connections With Ground Reference 2 7 2 8 3 BOARD OPERATION This chapter describes the features of the TMX32 how to install resistors and capacitors for some types of input signal conditioning and board operation 3 1 3 2 The TMX32 multiplexes up to 32 single ended 16 differential analog input channels into a single input channel on your A D converter board The board also has temperature sensing circuitry for thermocouple measure ments jumper selectable or software selectable gain and channel by channel offset adjustment Figure 3 1 shows the functional block diagram of the board DISABLED VE oO DISABLED AIN8 COLD JUNCTION TEMPERATURE uL AIR oANi6 SENSOR INPUT CIRCUIT CHANNEL SELECT SINGLE JUMPER PGA UE ENDER 1 10 100 1000 g DIFFERENTIAL 1 2 4 8 SELECT AIN3 O AIN4 AIN5 AING o gt OFFSET TRIM TERMINAL BLOCK INPUT CIRCUI
20. how to develop these circuits and the formulas for calculating resistance and capacitance values Low Pass Filter Single Ended Inputs A low pass filter on your single ended inputs can reduce noise by filtering out harmonics and other undesirable frequency components Figure 3 2 shows you how to build this circuit The table included in Figure 3 2 shows you where to install the components Ra and Ca on the board for each channel 3 8 1 a Rcs 24 R24 RC24 e re mos nas Formula Frequency 1 2pRaCal R29 R C29 ee ee ee R14 R C30 R16 R32 R C32 Fig 3 2 Single Ended Low Pass Filtering Low Pass Filter Differential Inputs A low pass filter on your differential inputs can reduce noise by filtering out harmonics and other undesirable frequency components Figure 3 3 shows you how to build this circuit The table included in Figure 3 3 shows you where to install the components Ra Rb and Ca on the board for each channel Channel Ra Rb Ca 3 R19 Ca 5 R5 21 B 6 Re R22 AIN 7 R7 3 R C39 R2 24 RC40 R2 R C41 8 R8 9 9 5 Formula Frequency 1 2p Ra Rb Ca R10 R26 R C42 Example 10 R11 R27 R C43 Rb 10Kw Ca 1000 pF Frequency 1 2p 10 x 103 10 x 10 x 1000 x 10 2 Frequency 7 958 kHz Fig 3 3 Differential Low Pass Filtering 3 9 Attenuator S
21. inciples and that you can provide the software necessary to control the TMX32 board When You Need Help This manual provides enough information to properly use your board s features If you have any problems installing or using this board contact our Technical Support Department 814 234 8087 during regular business hours eastern standard time or eastern daylight time or send a FAX requesting assistance to 814 234 5218 When sending a FAX request please include your company s name and address your name your telephone number and a brief description of the problem 1 BOARD SETTINGS The TMX32 has jumper and switch settings you can change if necessary for your application The factory settings are listed in the table and shown on the board layout in the beginning of this chapter Should you need to change these settings use these easy to follow instructions Factory Configured Switch and Jumper Settings Table 1 1 on the next page lists the factory settings of the user configurable switch and jumpers on the TMX32 board Figure 1 1 shows the board layout and the locations of the factory set jumpers The following paragraphs explain how to change the factory settings CA POnCO 1O0 z 00000000 e LM IN12 128 GND lt NEIN lat 86 0000000000000 c V Fig 1 1 Board Layout Showing Factory Configured Settings 1 3
22. ingle Ended Inputs An attenuator or voltage divider can be used to reduce the voltage level of the incoming signal so that it falls within the analog input voltage range of your A D converter board Figure 3 4 shows you how to build this circuit The table included in Figure 3 4 shows you where to install the components Ra and Rb on the board for each channel Channel Ra Rb Channel Ra Rb 1 R1 RC1 17 R17 RC17 Ra 2 R2 RC2 18 R18 RC18 AIN 3 R3 R C3 19 R19 R C19 4 R4 RC4 20 R20 R C20 5 R5 R C5 21 R21 RC21 Rb 6 R6 R C6 22 R22 RC22 7 R7 R C7 23 R23 R C23 8 R8 8 24 R24 R C24 9 R9 RC9 25 R25 R C25 Formula Vout Vin Rb Ra Rb 10 R10 R C10 26 R26 R C26 11 R11 R C11 27 R27 27 Example E pie 12 212 12 28 R28 R C28 Vin 3V 13 R13 RC13 29 R29 R C29 Vout 3 20 x 10 10 x 10 20 x 10 a Bee 30 Vout 2V 15 R15 15 31 R31 R C31 16 R16 RC16 32 R32 R C32 Fig 3 4 Single Ended Attenuator Current Shunt Differential Inputs When your signal source provides an input current instead of a voltage a current shunt is used to convert the input current into a voltage Figure 3 5 shows you how to build this circuit The table included in Figure 3 5 shows you where to install Ra on the board for each channel Grounding the Negative Input Differential Inputs When your signal sour
23. ment The temperature sensor s voltage output can be routed through channel 8 or 16 on the A D board where it is available to correct thermocouple measurements through software This manual provides information and general formulas for thermocouple measurement and compensation MX32 Compatibility The TMX32 also replaces the earlier MX32 analog input expansion board For those ordering an MX32 Appendix C explains the changes made to configure the board as an MX32 equivalent What Comes With Your Board You receive the following items in your TMX32 package TMX32 analog input expansion board User s manual If any item is missing or damaged please call Real Time Devices Customer Service Department at 814 234 8087 If you require service outside the U S contact your local distributor In addition to the items included in your TMX32 package Real Time Devices offers a full line of board accessories Key accessories for the TMX32 include the XT50 twisted pair cable TB50 terminal board and 50 prototype terminal board which can be connected to the daisy chain connector for prototype development and easy signal access Using This Manual This manual is intended to help you get your new board running quickly while also providing enough detail about the board and its functions so that you can enjoy maximum use of its features even in the most complex applications We assume that you already have an understanding of data acquisition pr
24. nal 12 volt power Miniature screw terminal blocks for easy input signal connection Extra I O connector for daisy chaining cascade up to 16 boards The following paragraphs briefly describe the major function of the board A more detailed discussion of the board is included in Chapter 3 Board Operation The board setup is described in Chapter 1 Board Settings Multiplexing Two on board multiplexers receive up to 32 single ended or 16 differential analog input channels and route them to the selected channel on the A D converter board The A D converter channel to which these inputs are fed is selected using jumpers on the TMX32 Channel selection is made using five digital control lines connected from the A D converter board to the TMX32 The input voltage range of the TMX32 channels is the same as the range of A D converter board Jumper selectable gains of 1 10 100 and 1000 are available on the TMX32 or the gain can be programmed through software using two digital control lines connected from the A D board The gains available on the TMX32 when coupled with the gains on the A D board yield a very flexible signal amplification capability On board circuit pads are provided so that you can construct several different types of conditioning circuitry on each input signal Thermocouple Compensation The TMX32 has an on board sensor for cold junction temperature sensing and amplification which makes the board ideal for thermocouple measure
25. nnect the high side of the signal source to the selected IN terminal and connect the low side to one of GND terminals Note that channels 17 through 32 are labeled in parentheses on the board Figure 2 3 shows you how to make these connections 2 4 MUX TERMINAL BLOCK SIGNAL SOURCE 1 our SIGNAL SOURCE 32 our Fig 2 3 Single Ended Input Connections Connecting Differential Analog Inputs In the differential mode up to 16 signal sources can be connected to the TMX32 When operating in the differential mode twisted pair cable is recommended to reduce the effects of magnetic coupling at the inputs Your signal source may or may not have a separate ground reference Figure 2 4 shows how to connect the input if you do not have a ground reference from the signal source and Figure 2 5 shows you how to make the connections with a ground reference from the signal source 2 5 If your signal source DOES HAVE a ground reference signal Refer to Figure 2 4 and install a 100 kilohm resistor in the appropriate resistor location on the board as shown in the table below Next connect the high side of the analog input to the selected analog input channel IN1 through IN16 and connect the low side of the input to the corresponding IN pin as shown in Fig ure 2 4 MUX TERMINAL BLOCK Channel 1 our SIGNAL SOURCE SIGNAL SOURCE 16 our Fig 2 4 Differential Input Connections Without Ground Refer
26. nput channels P3 is used to set the desired input channel and P4 is used to set the corresponding ground for that channel For example if you place the jumper across the pins for channel on P3 as shown in Figure 1 2 you should place the P4 jumper across the channel ground pins labeled 9 1 on the board as shown You must install both jumpers the selected channel jumper and the correspond ing ground jumper regardless of whether you are operating in the single ended or differential mode CHANNEL GND serect P sex 16 8 15 7 14 6 13 5 12 4 11 3 10 2 N oO AB 0 O 9 1 Fig 1 2 Channel Select Jumpers 8 Channel A D Boards For 16 Input Channels single ended on A D board When you connect the TMX32 to an A D converter board with 16 input channels only one jumper is installed on P3 and P4 Figure 1 3 shows you how to configure the TMX32 for channel 1 and Figure 1 4 shows you how to configure the TMX32 for channel 9 when used with a 16 channel A D converter board Note that the leftmost row of pins on P3 carries the analog input signal for chan 1 4 CHANNEL GND serect P sex 16 8 15 7 14 6 13 5 12 4 11 3 10 2 1 9 1 N fF 0 O Fig 1 3 Connecting Channel 1 to a 16 Channel A D Board CHANNEL GND seLecr P sel 16 8 15 7 14 6 13 5 12 4 11 3 10 2 N gt 0 O O Fig 1 4 Connecting Channel 9 to
27. ns how the offset adjustment is used for measurements 2 1 Fig 1 7 Offset Adjustment Source Select Jumper P7 P8 Power Source Select Factory Setting Internal P8 lets you select the power source for the TMX32 When the jumper is placed across the INT pins power is supplied from the 5 volt pin on the A D board This will be satisfactory for most applications If several TMX32 boards or other front end boards such as relay boards are to be connected to the same A D board or if you suspect that the internal 5 volt supply is causing noisy readings it is recommended that you power the TMX32 from an external 12 volt supply connected to TB4 An internal 5 volt regulator converts the external 12 volts to the proper voltage for the board When external power is used move the jumper on P8 to EXT 8 INT EXT Fig 1 8 Power source select P8 P9 Single Ended Differential Analog Inputs Factory Setting Single Ended P9 shown in Figure 1 9 configures the analog input channels for single ended or differential operation S P9 Fig 1 9 Analog Input Signal Type Jumper P9 2 BOARD CONNECTIONS This chapter tells you step by step how to connect the TMX32 to your A D converter board and to your external signal sources 2 1 2 2 Connecting to the A D Converter Board Connecting to a 50 pin A D Converter Board Figure 2 1 shows the TMX32 s P1 I O connector pinout with all of the pins
28. or 1000 0 1 typ 1 0 Overvoltage protection 235 Common mode input 10 volts Analog QUIPUEFANDO e ru nm epe i tec et rick 10 volts max Non lineaflty cereo eei beo ora 0 01296 max Temperature Sensor Temperature range 55 to 125 Accuracy over 2 Temperature coefficient eese nnne nnne 10mV C Output atlantica 250 mV Current Power Requirements 5 VOllS ride ibit ert Eiern 70 mA Power CconsumpltiOn 2 enr etii eee 350 mW Connectors Two 50 pin shrouded headers with ejector tabs Size 6 875 L x 5 0 W 175mm x 127mm A 3 4 APPENDIX TMX32 50 PIN CONNECTOR PINOUT 1 2 TMX32 Pinout CHANNEL 1 CHANNEL 9 GND 1 CHANNEL 2 CHANNEL 10 GND 2 CHANNEL 3 CHANNEL 11 GND 3 CHANNEL 4 CHANNEL 12 GND 4 CHANNEL 5 CHANNEL 13 GND 5 CHANNEL 6 CHANNEL 14 GND 6 CHANNEL 7 CHANNEL 15 GND 7 CHANNEL 8 CHANNEL 16 GND 8 DAC1 IN ANALOG GND DAC2 IN ANALOG GND ANALOG GND ANALOG GND DIN 6 DIN 5 DIN 4 DIN 3 DIN 2 DIN 1 DIN 0 5 VOLTS DIGITAL GND 12 VOLTS 12 VOLTS B 3 4 APPENDIX MX32 CONFIGURATION 2 The TMX32 is a direct replacement of the MX32 analog input expansion board For those ordering an MX32 board the TMX32 is sent with the following modifi
29. same channel damage to the boards and data acquisition system can result CHANNEL 9 GND 1 CHANNEL 10 GND 2 CHANNEL 11 GND 3 CHANNEL 12 GND 4 CHANNEL 1 OO CHANNEL 2 5 CHANNEL 3 CHANNEL 4 208 OO CHANNEL 5 OW CHANNEL 13 GND 5 CHANNEL 6 23 CHANNEL 14 GND 6 CHANNEL 7 33 CHANNEL 15 GND 7 CHANNEL 8 99 CHANNEL 16 GND 8 DAC1 IN 29 ANALOG GND DAC2 IN ANALOG GND ANALOG GND ene ANALOG GND 9 8 69 DIN 6 7 8 DIN 5 DIN 4 SE DIN 3 63 63 DIN 2 65 69 DIN 1 GDG DIN 0 12 VOLTS 5 VOLTS 12 VOLTS DIGITAL GND Fig 2 1 P1 Connector Pin Assignments 2 3 Connecting to the Signal Sources Figure 2 2 shows TB1 and TB2 where the analog input signal sources are connected These 20 terminal miniature screw terminal strips let you easily connect and disconnect analog inputs to the board Four additional analog ground terminals are provided on each strip for your convenience when connecting signal sources e Oe eL u om iome me Im i The ei Tho m Th I Fio me 2 00000000000000 XEM L zh emCeso emriemrie e 7 me Lm ei me e000000000009 ef E 099056600999 en Fig 2 2 Board Layout TB1 TB2 and TB3 Connecting Single Ended Analog Inputs In the single ended mode up to 32 signal sources can be connected to the TMX32 Co
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