CIO-EXP32
Analog Multiplexer board
User's Guide
Document Revision 1, January, 2007
© Copyright 2007, Measurement Computing Corporation
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HM CIO-EXP32.doc
3
Trademark and Copyright Information
TracerDAQ, Universal Library, Harsh Environment Warranty, Measurement Computing Corporation, and the Measurement
Computing logo are either trademarks or registered trademarks of Measurement Computing Corporation.
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means, electronic, mechanical, by photocopying, recording, or otherwise without the prior written permission of Measurement
Computing Corporation.
Notice
Measurement Computing Corporation does not authorize any Measurement Computing Corporation product for use
in life support systems and/or devices without prior written consent from Measurement Computing Corporation.
Life support devices/systems are devices or systems which, a) are intended for surgical implantation into the body,
or b) support or sustain life and whose failure to perform can be reasonably expected to result in injury.
Measurement Computing Corporation products are not designed with the components required, and are not subject
to the testing required to ensure a level of reliability suitable for the treatment and diagnosis of people.
4
Table of Contents
Preface
About this User’s Guide .......................................................................................................................7
What you will learn from this user’s guide.........................................................................................................7
Conventions in this user’s guide.........................................................................................................................7
Where to find more information.........................................................................................................................7
Chapter 1
Introducing the CIO-EXP32 ..................................................................................................................8
Overview: CIO-EXP32 features.........................................................................................................................8
Software features................................................................................................................................................8
Chapter 2
Installing the CIO-EXP32 ......................................................................................................................9
What comes with your CIO-EXP32 shipment?..................................................................................................9
Hardware .......................................................................................................................................................................... 9
Optional components........................................................................................................................................................ 9
Additional documentation................................................................................................................................................. 9
Unpacking the CIO-EXP32................................................................................................................................9
Connecting to the A/D board............................................................................................................................10
Signal cable......................................................................................................................................................................10
Cabling.............................................................................................................................................................................10
Configuring the CIO-EXP32............................................................................................................................11
Power source....................................................................................................................................................................13
A/D board type ................................................................................................................................................................14
A/D Channel for EXP Output..........................................................................................................................................14
EXP Gain.........................................................................................................................................................................15
Solder gap switches .........................................................................................................................................................16
Configuring the A/D board...................................................................................................... .........................16
Single-ended mode ..........................................................................................................................................................16
Range...............................................................................................................................................................................16
Polarity.............................................................................................................................................................................17
Calibrating the CIO-EXP32..............................................................................................................................17
Chapter 3
Functional Details ...............................................................................................................................18
CIO-EXP32 inputs............................................................................................................................................18
Connecting to a signal source..........................................................................................................................................18
Thermocouples.................................................................................................................................................19
Cold junction compensation.............................................................................................................................................20
Open thermocouple detect...............................................................................................................................................20
Low pass filter.................................................................................................................................................................20
Ground reference .............................................................................................................................................................20
Input impedance...............................................................................................................................................................20
Amplification and thermocouples.....................................................................................................................20
Chapter 4
Programming and Developing Applications ....................................................................................22
Programming languages...................................................................................................................................22
Packaged applications programs.......................................................................................................................22
Chapter 5
Specifications......................................................................................................................................23
Analog input.....................................................................................................................................................23
Cold junction compensation.............................................................................................................................23
Analog output...................................................................................................................................................24
5
CIO-EXP32 User's Guide
Digital input......................................................................................................................................................24
Power consumption..........................................................................................................................................24
Environmental ..................................................................................................................................................24
Main connector and pin out..............................................................................................................................25
6
Preface
About this User’s Guide
What you will learn from this user’s guide
This user’s guide explains how to install, configure, and use the CIO-EXP32 so that you get the most out of its
analog input and digital I/O features.
This user’s guide also refers you to related documents available on our web site, and to technical support
resources.
Conventions in this user’s guide
For more information on …
Text presented in a box signifies additional information and helpful hints related to the subject matter you are
reading.
Caution! Shaded caution statements present information to help you avoid injuring yourself and others,
damaging your hardware, or losing your data.
<#:#> Angle brackets that enclose numbers separated by a colon signify a range of numbers, such as those assigned
to registers, bit settings, etc.
bold text Bold text is used for the names of objects on the screen, such as buttons, text boxes, and check boxes. For
example:
1. Insert the disk or CD and click the OK button.
italic text Italic text is used for the names of manuals and help topic titles, and to emphasize a word or phrase. For
example:
The InstaCal installation procedure is explained in the Quick Start Guide.
Never touch the exposed pins or circuit connections on the board.
Where to find more information
The following electronic documents provide helpful information relevant to the operation of the CIO-EXP32.
MCC's Specifications: CIO-EXP32 (the PDF version of the Specifications chapter in this guide) is available
on our web site at www.mccdaq.com/pdfs/CIO-EXP32.pdf
MCC's Quick Start Guide is available on our web site at
www.mccdaq.com/PDFmanuals/DAQ-Software-Quick-Start.pdf
MCC's Guide to Signal Connections is available on our web site at
www.mccdaq.com/signals/signals.pdf
MCC's Universal Library User's Guide is available on our web site at
www.mccdaq.com/PDFmanuals/sm-ul-user-guide.pdf
MCC's Universal Library Function Reference is available on our web site at
www.mccdaq.com/PDFmanuals/sm-ul-functions.pdf
MCC's Universal Library for LabVIEW
www.mccdaq.com/PDFmanuals/SM-UL-LabVIEW.pdf
CIO-EXP32 User's Guide (this document) is also available on our web site at
www.mccdaq.com/PDFmanuals/CIO-EXP32.pdf
.
™
User’s Guide is available on our web site at
.
.
.
.
.
.
7
Introducing the CIO-EXP32
Overview: CIO-EXP32 features
Chapter 1
The CIO-EXP32 is a 32-channel signal conditioning accessory board supported under popular Microsoft®
Windows
The CIO-EXP32 is used to expand the number of analog inputs and the range of amplification of DAS08 and
DAS16 series boards. Using multiple CIO-EXP32 boards, a 16 channel A/D board can be expanded to up to
256 inputs; an 8 channel A/D board can be expanded to up to 128 inputs.
The CIO-EXP32 board has two banks of 16 differential inputs that are multiplexed into one single-ended output
channel. Four digital inputs are controlled by the A/D board's digital outputs, and are used to select one of the
multiplexed channels for output. An on-board semiconductor sensor provides a cold junction compensation
(CJC) reference for thermocouple applications.
You select one channel on the A/D board to send the multip lexed analog output to. In addition, you can output
the CJC signal to a second A/D board channel. You can enable an input filter, ground reference, and open
thermocouple detect options for each channel using on-board solder gap switches. You specify the gain of the
multiplexer with an onboard gain switch.
You can power the CIO-EXP32 internally from the A/D board, or externally from the computer's +5 V power
supply connectors.
The CIO-EXP32 board is mounted externally to the PC. It can be placed in the open on a benchtop or in a case.
®
operating systems.
Software features
For information on the features of InstaCal and the other software included with your CIO-EXP32, refer to the
Quick Start Guide that shipped with your device. The Quick Start Guide is also available in PDF at
www.mccdaq.com/PDFmanuals/DAQ-Software-Quick-Start.pdf
.
Check www.mccdaq.com/download.htm
for the latest software version.
8
Installing the CIO-EXP32
What comes with your CIO-EXP32 shipment?
The following items are shipped with the CIO-EXP32.
Hardware
CIO-EXP32
Chapter 2
Optional components
You can also order the following MCC products to us e with your CIO-EXP32.
C37FF-x
C-EXP2DAS16-10
C-PCPOWER-10
BP-POWER
Additional documentation
In addition to this hardware user's guide, you should also receive the Quick Start Guide (available in PDF at
www.mccdaq.com/PDFmanuals/DAQ-Software-Quick-Start.pdf
the software you received with your CIO-EXP32 and information regarding installation of that software. Please
read this booklet completely before installing any software or hardware.
). This booklet supplies a brief description of
Unpacking the CIO-EXP32
As with any electronic device, you should take care while handling to avoid damage from static
electricity. Before removing the CIO-EXP32 from its packaging, ground yourself using a wr ist strap or by
simply touching the computer chassis or other grounded object to eliminate any stored static charge.
If any components are missing or damaged, notify Measurement Computing Corporation immediately by
phone, fax, or e-mail:
Phone: 508-946-5100 and follow the instructions for reaching Tech Support.
Fax: 508-946-9500 to the attention of Tech Support
Email: techsupport@mccdaq.com
9
CIO-EXP32 User's Guide Installing the CIO-EXP32
Connecting to the A/D board
There are two 37-pin D type connectors on the CIO-EXP32 — P1 and P2. They are wired 1:1. Connector P1 is
labeled
chain the CIO-EXP32 boards together. Do not exceed 50 feet in length.
Signals may be connected from the CIO-EXP32 board to the A/D board through one of two types of cables. The
cable used depends upon the type of A/D board you are connecting to. The table below lists the CIO-EXP32
board's connectors and compatible cables.
Connector type P1 and P2: 37-pin D type connector
Compatible cables with connector P1 C37FF-x (connecting to additional CIO-EXP32 boards)
Compatible cables with connector P2
Signal cable
The CIO-EXP32 signal connector is nearly a mirror of the CIO-DAS08 signal cable.
NEXT EXP, and is provided to daisy chain additional CIO-EXP32 boards. Use a C37FF-x cable to daisy
Board connector, cables, and accessory equipment
C37FF-x (connecting to a DAS08 board)
C-EXP2DAS16-10 (connecting to a DAS16 board)
Cabling
NC / LLGND 19
LLGND / Output 18
Output 9 17
Output 10 16
Output 11 15
Output 12 14
Output 13 13
Output 14 12
Output 15 11
MUX Addr 4 10
MUX Addr 3 9
MUX Addr 2 8
MUX Addr 1 7
NC 6
NC 5
NC 4
NC 3
NC 2
+12V PC Bus 1
Figure 1. Connector P2/P1
37
19
37 Output 0
36 Output 1
35 Output 2
34 Output 3
33 Output 4
32 Output 5
31 Output 6
30 Output 7
29 +5V
28 Power GND
27 NC
26 NC
25 NC
24 NC
23 NC
22 NC
21 NC
20 -12V PC Bus
37
19
The red stripe
20
1
Figure 2. C37FF-x cable
identif i es pi n # 1
20
1
10
CIO-EXP32 User's Guide Installing the CIO-EXP32
Connecting to a DAS08 Series A/D board
Leave the
A/D BOARD TYPE jumper in the default DAS08 position. Use a C37FF-x cable to connect to DAS08
series boards.
Connecting to a DAS16 Series A/D Board
Set the
A/D BOARD TYPE jumper to the DAS16 position.
Connection to a DAS16 series board requires a special 37-conductor cable (C-EXP2DAS16-10) since the pin
relationship of the CIO-EXP32 and DAS16 signals is not 1:1. Refer to the
C-EXP2DAS16-10 cable pin out
table below.
C-EXP2DAS16-10 cable pin out
P1 (MUX) P2
7 23
8 4
9 22
10 3
11 11
12 12
13 13
14 14
15 15
16 16
17 17
18 18
19 19
28 7
29 1
30 30
31 31
32 32
33 33
34 34
35 35
36 36
37 37
N/C Shell Shield
Information on signal connections
General information regarding signal connection and configuration is available in the Guide to Signal
Connections (available at www.mccdaq.com/signals/signals.pdf).
11
CIO-EXP32 User's Guide Installing the CIO-EXP32
Configuring the CIO-EXP32
Before using the CIO-EXP32, there are switches and jumpers to set, and one or more cables to install. Please
turn the PC power OFF before proceeding. The CIO-EXP32 is shipped with the factory-default settings listed in
the following table.
Factory-configured default settings
Jumper/switch Description Default setting
Power source select switch
S3
+5V power switch that sets the power
source to internal or external
A/D BOARD TYPE jumper Selects DAS08 or DAS16 compatibility DAS08
EXP OUTPUT TO DAS
jumper
CJC OUTPUT TO DAS
jumper
GAIN switches
S1 and S2
Selects the A/D board channel to connect
the multiplexed analog output to.
Selects the A/D board channel to connect
the CJC output to.
Four DIP switches per each bank of 16
inputs that set the gain of the differential
amplifier.
V, C and G solder bridge
switches (one for each input
channel)
Three 'connect pads' per channel on the etch
side (under side) of the CIO-EXP32 board.
Bridge each pad to configures its associated
input channel as follows:
Bridge the V pads to enable open
thermocouple detection for the associated
input channel.
Bridge the C pads to connect a 1 µF
capacitor across the signal high and low
inputs, forming a low-pass filter having a
7 Hz cutoff.
Bridge the G pads to enable a reference
to ground for the associated input
channel.
INT (internal +5V PC power)
CH 0 to 15: 0
CH 16 to 31: 1
(EXP multiplexed output connects to
channel 0 and 1 on the A/D board)
7
(CJC circuit connects to channel 7 on the
A/D board)
Gain = 1 (all gain switches OFF)
Open pads (all are not bridged)
Figure 3
shows the location of the board jumpers, switches, and connectors. The solder bridges are on the under
side of the board, and are not shown in the figure.
A/D Board Type
External power
connector
P29
jumper
P2
connector
(DAS)
P1
connector
(Next EXP)
Gain
switches
S1
EXP and CJC Output to
DAS channel jumpers
Gain
switch
S2
Power
source switch
S3
Figure 3. Switch, jumper, and connector locations
Before using the CIO-EXP32, verify that the board is configured with the settings that you want. Review the
following information to change the default configuration of a jumper, switch, or solder gap.
12
CIO-EXP32 User's Guide Installing the CIO-EXP32
Power source
You can supply +5V DC power to the via the 37-conductor cable from the A/D board in the PC (internal), or via
a separate optional power cable connected directly to the PC power supply (external). The internal method is
adequate for powering up to two CIO-EXP32 boards. Supply external power (connect the C-PCPOWER-10
power cable) when:
More than two CIO-EXP32 boards are used with one A/ D board.
The A/D board in use does not supply +5V to its connector
Configure the CIO-EXP32 board’s power source with switch
S3 for either internal or external power. Figure 4
shows this switch configured in both positions.
+5V
S3
EXT INT
Internal power
+5V power from the
PC via 37 conductor
signal cable
Figure 4. Power source-select switch
+5V
S3
EXT INT
External power
+5V power from the
PC via 2 conductor
optional
p
C-PCPOWER-10
ower cable
External +5 V PC power connections
You can power the CIO-EXP32 with your computer’s +5V power supply using the optional
cord. Each end of the cable has a keyed Molex
®
type connector. To connect to your computer’s power
C-PCPOWER-10
connectors, do the following:
1.
Turn off power to the computer and remove the cover.
2.
Connect the black cable with the white Molex
®
type connectors to one of the unused PC expansion power
connectors from the PC power supply. They are keyed, so the cable will plug into the expansion connector
easily when they are aligned (see ). Figure 5
Personal Computer
J3 to PC Power Supply
DC/DC
CIO-EXP32
Figure 5. External power cable installation
Power cable
Signal cable
P2 to CIO-DAS08
analog board
3. Run the power cable out the back of the computer through an expansion slot or other opening and replace
the cover on the computer.
13
CIO-EXP32 User's Guide Installing the CIO-EXP32
You can alternatively connect the C-PCPOWER-10 to a BP-POWER adaptor to bring PC power out of the
computer. This adaptor provides three standard power connectors mounted on a backplate. Details on this
product are available on our web site at
www.mccdaq.com/products/accessories.aspx
.
Caution! Be careful not to pinch the cable when you replace the cover—if this cable is cut, the resulting short
circuit can damage the computer.
4.
Connect the other end of the power cord to the connector labeled "
P15) on the CIO-EXP32. This end is keyed also. Refer to for the location of this connector. Figure 3
(
5.
Slide the power source select switch (
S3) to the EXT position.
OPTIONAL EXTERNAL +5V POWER"
A/D board type
Use the 4-pin jumper labeled A/D BOARD TYPE to configure the CIO-EXP32 for use with the DAS08 family
of boards or the DAS16 family of boards. Place the jumper in the position for the type of A/D board y ou are
using with the CIO-EXP32. Fig shows the jumper configured with its default setting of DAS08. ure 6
LLGND
DAS16DAS08
P2, pin19
P2, pin 18
Figure 6. Board type select jumper
A/D Channel for EXP Output
Select a separate A/D channel for each CIO-EXP32 output that you plan to use. Each CIO-EXP32 has three
potential signals — the output of each of the two banks of 16 multiplexed inputs, and the output of the CJC
circuit. The output of the CIO-EXP32 selected channel is an input to the A/D board.
Three rows of 16 jumper pairs located near the 37-pin connectors are labeled with A/D board channel numbers
(see ). These channel numbers designate which of the A/D board's inpu t channels will be connected to
Figure 7
the MUX board’s output(s). Each CIO-EXP32 output, if used, must be exclusively assigned to an A/D channel
using these jumpers. In other words, for all CIO-EXP32 boards attached to an A/D board, only one jumper on
any of the jumper blocks should be assigned to a particular channel.
Figure 7
shows the layout of the jumper blocks on the CIO-EXP32.
EXP OUTPUT TO DAS
01234567
DAS8/16 DAS16 ONLY
CJC OUTPUT TO DAS
Figure 7. EXP Channel Select and CJC Select jumper blocks
891011 12
These jumpers are for boards with
16 channels only, such as the
CIO-DAS16 in 16 channel mode.
1314
EXP
0-15
15
EXP
16-31
CJC
The CIO-EXP32 has two banks of 16 input channels. Each bank is multiplexed into one output. These two
outputs connect to the jumper block labeled
EXP OUTPUT TO DAS. This jumper block determines which
analog input channels of the A/D board in the computer is connected to the outputs from the CIO-EXP32 board.
14
CIO-EXP32 User's Guide Installing the CIO-EXP32
The CIO-EXP32 also has a semiconductor temperature sensor on board to measure the temperature of the board
in the region of the screw terminals. The temperature at the screw terminals is needed when thermocouples are
used with the CIO-EXP32. The temperature at the screw terminals is called the Cold Junction temperature, and
is needed to accurately calculate thermocouple temperature. This is known as Cold Junction Compensation.
When a CIO-EXP32 channel is used with a thermocouple, install the
CJC OUTPUT TO DAS jumper in the
desired channel location. If you are not using thermocouples, do not install it.
Select the A/D board channel to connect the multiplexed analog output to using the jumpers labeled
OUTPUT TO DAS.
EXP
Channels 0-15 are connected by default to A/D board channel 0. Channels 16-31 are connected by default
to A/D board channel 1.
Select the A/D board channel to connect the CJC output to (if required) using the jumpers labeled
OUTPUT TO DAS
.
CJC
CIO-EXP CJC is connected by default to A/D channel 7.
Channel selection for the DAS08 family
The DAS08 family of boards has eight channels of input, so only CIO-EXP32 jumper positions 0-7 are valid.
Many boards in the DAS08 family of boards have single-ended inputs, which is the correct type to connect to a
CIO-EXP32. If the inputs on the board type you are using are differential, they must be converted to singleended inputs (refer to the hardware user's manual supplied with your A/D board for more information).
You can connect up to eight banks of CIO-EXP32 inputs to a DAS08 series board, for a total of 128 inputs.
Channel selection for the DAS16 family
The CIO-EXP32 jumper positions 0-7 and 8 -1 5 can be used with the CIO-DAS16. You can connect up to
16 banks of CIO-EXP32 inputs to a DAS16 series board, for a total of 256 inputs.
Most of the DAS16 family of A/D is switch-selectable for either 8 differential or 16 single-ended channels. Set
the switch for 16-channel, single-ended mode.
EXP Gain
The CIO-EXP32 has two banks of four DIP switches (S1 and S2) that control the gain of the differential
amplifier. shows a typical switch. Figure 8
x500
x200
x100
x10
ON = left
Figure 8. Gain switch
The gain associated with a switch is 'ON' when the switch is to the left, and 'OFF' when the switch is to the
right. The gains are additive, so a total of 16 different gains are possible. The board is shipped with all switches
off (gain =1). The switch shown in Figu is configured for a gain of 700 (500 + 200).
re 8
For most thermocouple applications, the gain should be set to at least 100. Refer to the section
and thermocouples
on page 20 for data on setting optimum amplifier gains when using thermocouples.
For most other applications, the gain should be set to result in output signal levels as close to ±5V or ±10V
(depending on the range setting on the A/D board) as possible.
4
3
2
1
Amplification
15
CIO-EXP32 User's Guide Installing the CIO-EXP32
Solder gap switches
Each analog input channel on the CIO-EXP32 has three dedicated solder gap switches labeled C, V, and G on
the circuit side (under side) of the board. Each solder gap switch enables a different thermocouple option. A
typical set of solder gap switches is shown here.
V C G
Figure 9. Solder gap switches (typical per channel)
A solder gap switch has two pads. Turn on each switch by soldering the pads together to close them — this is
called a solder bridge. When closed, or bridged, the pads connect resistors and capacitors to the input signals
and enable the following options:
Open thermocouple detect (V pad) — enables open thermocouple detection to alert you if a
thermocouple breaks. Note that your software program must be designed to recognize when a negative
full-scale condition exists, since the input is pulled to minus full-scale if the thermocouple wire is
broken or disconnected.
Input filter (C pad) — connects a 1 µF capacitor across the signal high and low inputs. This forms a
7 Hz low pass filter that filters out signal noise that is picked up on the thermocouple wire.
Input ground reference (G pad) — provides a reference to ground through a 100 k resistor. This
reference prohibits floating thermocouple readings.
You should bridge the C and G pads with solder for each channel that you install a thermocouple. Bridging
these pads reduces the noise present when you take temperature readings, and helps to obtain a more accurate
temperature reading. The C, V, and G pads are all open when the board is shipped.
How to add and remove a solder bridge
To add a solder bridge to a solder gap switch, place a drop of solder on one of the pads and pull the soldering
iron perpendicular to the pads from their center. To remove a solder bridge, slide the soldering iron toward one
pad or the other. Take care not to overheat the solder, or the pads may lift.
Configuring the A/D board
Use InstaCal to change the following configuration options on your DAS08 or DAS16 Series board.
Single-ended mode
DAS08 setup: The input mode of the A/D board must be single-ended to be compatible with the CIO-EXP32
outputs. Some of the boards in the DAS08 series have differential inputs that can be converted to single-ended
inputs. Refer to the user's manual for your hardware for information on conversion to single-ended inputs.
DAS16 setup: The input mode of the A/D board must be single-ended to be compatible with the CIO-EXP32
outputs. Most of the DAS16 series is switch-selectable for either 8 differential or 16 single ended inputs. When
used with the CIO-EXP32, set the switch to 16 channel, single-ended mode.
Range
If the range of your A/D board is switch-selectable, and you are using thermocouples, set the range of the DAS
board to ±5 V, if available, or ±10 V if not. Some software packages base the calculation of temperature on
these ranges only.
If you are not using thermocouples, set the range of the DAS board to accommodate the maximum output
expected from the CIO-EXP32 board.
16
CIO-EXP32 User's Guide Installing the CIO-EXP32
Polarity
If your A/D board has a UNI / BIP switch for setting the range to either unipolar or bipolar, the preferred setting
is BIP (bipolar).
If the range on your A/D board is fully programmable, the software you use for temperature measurement will
determine the correct range to use.
Calibrating the CIO-EXP32
You should calibrate the CIO-EXP32 after you first connect to a A/D board, if you change the gain setting of
the input amplifier, and at 6 month intervals.
17
Chapter 3
Functional Details
CIO-EXP32 inputs
The CIO-EXP32 inputs are screw terminals which will accept 12-22 AWG wire. Each channel has a screw
terminal for signal high, signal low and ground.
The inputs are differential, which require three connections from the signal source to the CIO-EXP32 — Signal
High, Signal Low, and Signal Ground. A typical connection is shown in . Figure 10
Signal High
Signal Low
Low Level Ground
Figure 10. Differential channel connections
Figure 11
shows a block diagram of the board’s 16 analog inputs. One input is selected by the four MUX
address lines that are controlled by the A/D board.
CH15 HIGH
CH15 LOW
MUX
HI-507
CH8 HIGH
CH8 LOW
GND
CH7 HIGH
CH7 LOW
MUX
HI-507
CH0 HIGH
CH0 LOW
GND
Figure 11. Analog inputs block diagram
AMP
INA1 10
4
Gain
Gain
Switch
Switch
MUX ADDR
EXP out to the
DAS board
Ground
Connecting to a signal source
You can connect analog inputs to the CIO-EXP32 in either a floating differential or differential configuration.
Before connecting to a signal source, measure the voltage between the signal ground at the signal source and
ground at the PC. Do not connect to a signal source if the voltage difference exceeds 10 V, as you will not be
able to obtain a reading.
Caution! DO NOT connect to the signal if the voltage exceeds 30 V — voltages over 30 V will damage the
board and possibly the computer.
18
CIO-EXP32 User's Guide Functional Details
Floating differential input
A floating differential input has two wires from the signal source, and a 100 K ground reference resistor
installed at the CIO-EXP32 input. The two signals from the signal source are Signal High (CH#-HI) and Signal
Low (CH#-LO). The reference resistor is connected between the CH#-LO and #-G (Signal Ground) pins.
Use a floating differential hookup when the signal source is floating with respect to ground, such as a battery, 420 mA transmitter or thermocouple, and the lead lengths are long or subject to electromagnetic interference
(EMI) pickup.
A thermocouple is an example of a floating differential signal source. Instead of using an external 100 K
resistor, add a solder bridge between the 'G' pads to enable a ground reference. The floating differential input
will reject up to 10 V of EMI.
Caution! Use a voltmeter to v erify that the signal source is floating, or you may damage the CIO-EXP32
and/or your computer.
Differential input
A differential signal uses three wires from the signal source — Signal High (CH#-HI), Signal Low (CH#-LO)
and Signal Ground (#-G).
With a differential configuration, you can connect the CIO-EXP32 to a signal source with a ground that is
different from the PC ground, but with less than 10 V difference, and still make a true measurement of the
signal between CH# HI and CH# LO. An example of this is a laboratory instrument with its own wall plug,
where there are sometimes differences in wall grounds between outlets.
Information on signal connections
For general information about signal connection and configuration, refer to the Guide to Signal Connections on
our web site at www.mccdaq.com/signals/signals.pdf.
Thermocouples
A thermocouple is made of two dissimilar wires that react electrically when in contact with each other. The
reaction produces a voltage which is dependent on the temperature at the point where the two metals touch.
There is a reaction at every point where dissimilar metals (the thermocouple wire) touch, including the screw
terminal where the thermocouple wire is connected to the CIO-EXP32 board.
To process thermocouple signals, the CIO-EXP32 provides cold junction compensation (CJC), open
thermocouple detect (OTD) and stable amplification for accurate temperature measurements.
Figure 12
and a negative lead. If you're not sure which is the positive lead and which is the negative lead, make a test
hookup and use a match to heat the thermocouple. If the temperature reading goes down, switch the leads.
shows a thermocouple connected to one channel of the CIO-EXP32. The thermocouple has a positive
3.9M
-15 V
C
1F
µ
High
Low
Thermocouple
positive lead
Thermocouple
negative lead
High
Low
Ground
10K
10K
V
100K
G
Ground
C = Filter capacitor, pad open. V = Open TC Detect, pad open. G = Reference to ground, pad open.
Pads are lo c ated on the c ircuit side. All pads must be clos ed when th ermocoup les are used.
Figure 12. Typical thermocouple connection
19
CIO-EXP32 User's Guide Functional Details
Cold junction compensation
The CIO-EXP32 has a semiconductor temperature sensor to measure the temperature of the board around the
screw terminals—this is called the cold junction temperature. This sensor provides a stable, accurate and linear
output which is temperature-dependent. The cold junction temperature is required to accurately calculate the
thermocouple temperature. This is known as cold junction compensation (CJC). You can map the sensor output
to one of the A/D board's analog inputs using the
The CJC reference is required for accurate temperature readings
The CJC temperature reference is universally used by software to compensate for the voltage induced at the
cold junction (the area around the screw terminals). If you don't supply a CJC reference your temperature
readings may be inaccurate.
CJC output to DAS jumper block.
Open thermocouple detect
You enable open thermocouple detect (OTD) by closing the channel’s associated 'V' pad with a solder bridge.
OTD applies a full-scale negative voltage to the high side of the thermocouple signal. If a thermocouple opens,
the OTD voltage drives the signal on that channel to negative full-scale.
Design your software program to recognize when a negative full-scale condition exists, since the input is pulled
to negative full-scale if the thermocouple wire is broken or disconnected. Most software is set up to alarm for an
open thermocouple when a temperature falls to negative full-scale.
The CIO-EXP32 will accurately measure thermocouples when the 'V' pad is open, but without OTD protection
enabled.
Low pass filter
A low pass filter is implemented by closing the 'C' pad. When bridged, a 1 µF capacitor is connected across the
signal’s high and low inputs, forming a low-pass filter. The bandwidth of this filter is 7 Hz. Signals changing at
rates greater than 7 times per second are damped. The low pass filter helps to reject noise picked up along the
thermocouple wire. Since temperature measurement is generally a ‘low frequency’ application, the filter does
not affect the temperature measurement.
The CIO-EXP32 will accurately measure thermocouples when the 'C' pad is open, but the measurements may
fluctuate due to noise present on the thermocouple wire.
Ground reference
The CIO-EXP32 inputs are fully differential, which help reject noise on thermocouple wires. Close the ‘G’ pad
thermocouples to work properly. The 'G' pad provides a referen c e from ground to the analog low input via a 100
K resistor. When closed, enough current passes through the resistor to provide a reference to ground . The
analog high and low inputs are still able to float within the common mode range.
Input impedance
When you leave the V and G pads open, the input impedance is greater than 100 M ohms. When you short the
V and G pads, the input impedance is 100 k ohms.
Amplification and thermocouples
The voltage from a thermocouple is very low and must be amplified to take advantage of the A/D board’s full
resolution. Use the
on page 15).
8
GAIN switch to set the amplification of the CIO-EXP32 board's 16 analog inputs (see
Figure
The following table lists the theoretical amplifier output voltage at maximum temperature for each gain. In most
cases, the range on the A/D board is set to ±5 V. The maximum voltage for some thermocouple/gain
combinations can exceed the maximum A/D input range (typically 5 V), or even the maximum output voltage
of the CIO-EXP32 board (±10 V).
20
CIO-EXP32 User's Guide Functional Details
Output voltage vs gain at maximum temperature
Type
100 200 300 500 800
J 0 750 42.28 4.2 8.5 12.7 21.1 33.8
K
T
E
S 0 1450 14.97 1.5 3.0 4.5 7.5 12.0
R 0 1450 16.74 1.7 3.3 5.0 8.4 13.4
Min Temp °C Max Temp °C
−200
−200
−200
1250 50.63 5.1 10.1 15.2 25.3 40.5
350 17.82 1.8 3.6 5.3 8.9 14.3
900 68.78 6.9 13.8 20.6 34.4 55.0
mV at
Max
Gain / Output Volts @ Max Temp
The table below lists the maximum readable temperatures for each gain and thermocouple type for an A/D
range of ±5V.
Gain vs maximum readable temperatures
Type Gain / Max. Readable Temps. with A/D Range = ±5 V
10 100 200 300 500 800
J MAX MAX 457 °C 307 °C 186 °C 117 °C
K MAX 1232 °C 602 °C 406 °C 246 °C 152 °C
T MAX MAX MAX 330 °C 214 °C 140 °C
E MAX 661°C 350 °C 244 °C 152 °C 98 °C
S MAX MAX MAX MAX 1035 °C 697 °C
R MAX MAX MAX 1445 °C 961°C 658 °C
To read the maximum usable temperature for type K and E thermocouples, set the gain to X10 or less.
After you change the gain setting, calibrate the CIO-EXP32 using the InstaCal utility.
21
Chapter 4
Programming and Developing Applications
After following the installation instructions in Chapter 2, your board should now be installed and ready for use.
In general there may be no correspondence among registers for different boards. Software written at the register
level for other models will not function correctly with your board.
Programming languages
Measurement Computing’s Universal Library provides access to board functions from a variety of Windows
programming languages. If you are planning to write programs, or would like to run the example programs for
Visual Basic
site at www.mccdaq.com/PDFmanuals/sm-ul-user-guide.pdf
Packaged applications programs
Many packaged application program s now have drivers for your board. If the package you own does n ot have
drivers for your board, please fax or e-mail the package name and the revision number from the install disks.
We will research the package for you and advise how to obtain drivers.
Some application drivers are included with the Universal Library package, but not with the application package.
If you have purchased an application package directly from the software vendor, you may need to purchase our
Universal Library and drivers. Please contact us by phone, fax or e-m a il:
or any other language, please refer to the Universal Library User's Guide (available on our web
).
Phone: 508-946-5100 and follow the instructions for reaching Tech Support.
Fax: 508-946-9500 to the attention of Tech Support
Email: techsupport@mccdaq.com
22
Specifications
Typical for 25 °C unless otherwise specified.
Specifications in italic text are guaranteed by design.
Analog input
Table 1. Analog input specifications
Parameter Specification
Number of channels 32 differential (2 banks of 16)
Input range ±10 V
Gain Switch selectable by bank, additive values of X1, X10, X100, X200 and X500
Calibration
Gain error Gain = 1 0.002% typical, 0.02% max
Non-linearity Gain = 1 0.0005% typical, 0.005%
Temperature coefficient Gain = 1 ± 20 ppm / °C
Common mode range ±10 V
CMRR @ 60 Hz 90 dB
Input filter 7 Hz, selectable through solder bridge (C pad)
Open thermocouple detect
Input ground reference 100k ohms to ground, selectable through solder bridge (G pad)
Input leakage current V and G pads open: 2 nA typical, 6 nA max
Input impedance
Absolute maximum input voltage
Two offset potentiometers per bank (16 channels) and one Cold Junction
Compensation adjustment potentiometer per board.
Gain = 10 0.005% typical, 0.05% max
Gain = 100 0.01% typical, 0.1% max
Gain = 200 0.02% typical, 0.2% max
Gain = 500 0.05% typical, 0.5% max
Gain = 10 0.001% typical, 0.01% max
Gain = 100 0.002% typical, 0.01% max
Gain = 200 0.003% typical, 0.01% max
Gain = 500 0.005% typical, 0.02% max
Gain = 10 ± 20 ppm / °C
Gain = 100 ± 40 ppm / °C
Gain = 200 ± 60 ppm / °C
Gain = 500 ± 100 ppm / °C
Offset ± 15 µV / °C
-50 mV at positive input when thermocouple is open, selectable through solder
bridge (V pad)
V and G pads open: >100 Meg Ohms min
V and G pads shorted 100 k Ohms min
Power on: ±35 V
Power off: ±20 V
Chapter 5
Cold junction compensation
Table 2. Cold junction compensation specifications
Parameter Specification
CJC output voltage 24 mV / °C
CJC zero crossing 0 mV at 0 °C
23
CIO-EXP32 User's Guide Specifications
Analog output
Table 3. Analog output specifications
Parameter Specification
Number of channels 2
Output voltage ±10 V
Configuration Single–ended
Current drive ±5 mA
Output coupling DC
Output impedance 0.1 Ohms max
Digital input
Table 4. Analog input specifications
Parameter Specification
Digital input: 74LS14
Configuration Four bits for selecting multiplexer channel 0 through 15
Number of channels 4 input
Input high 2.0 volts min, 7 volts absolute max
Input low 0.8 volts max, -0.5 volts absolute min
Power consumption
Table 5. Power consumption specifications
Parameter Specification
+5 V 300 mA typical, 390 mA max
Environmental
Table 6. Environmental specifications
Operating temperature range 0 to 60 °C
Storage temperature range -40 to 100 °C
Humidity 0 to 90% non-condensing
24
CIO-EXP32 User's Guide Specifications
Main connector and pin out
Table 7. Connector specifications
Connector type P1 and P2: 37-pin D type connectors
Compatible cables with connector P1 C37FF-x (connecting to additional CIO-EXP32 boards)
Compatible cables with connector P2
Pin Signal Name Pin Signal Name
1 +12V PC Bus 20 -12V PC Bus
2 NC 21 NC
3 NC 22 NC
4 NC 23 NC
5 NC 24 NC
6 NC 25 NC
7 MUX Addr 1 26 NC
8 MUX Addr 2 27 NC
9 MUX Addr 3 28 Power GND
10 MUX Addr 4 29 +5V
11 Output 15 30 Output 7
12 Output 14 31 Output 6
13 Output 13 32 Output 5
14 Output 12 33 Output 4
15 Output 11 34 Output 3
16 Output 10 35 Output 2
17 Output 9 36 Output 1
18 LLGND / Output 37 Output 0
19 NC / LLGND
C37FF-x (connecting to a DAS08 board)
C-EXP2DAS16-10 (connecting to a DAS16 board)
Table 8. Connector pin out
25
Declaration of Conformity
Manufacturer: surement Computing Corporation Mea
Address: 10 Commerce Way
Suite 1008
Norton, MA 02766
USA
Category: Electrical equipment for measurement, control and laboratory use.
Measurement Computing Corporation declares under sole responsibility that the product
CIO-EXP32
to which this declaration relates is in conformity with the relevant provisions of the following standards or other
documents:
EU EMC Directive 89/336/EEC: Electromagnetic Compatibility, EN55022 (1987), EN50082-1
Emissions: Group 1, Class B
EN55022 (1987): Radiated and Conducted emissions.
Immunity: EN50082-1
IEC 801-2 (1987): Electrostatic Discharge immunity, Criteria A.
IEC 801-3 (1984): Radiated Electromagnetic Field immunity Criteria A.
IEC 801-4 (1988): Electric Fast Transient Burst immunity Criteria A.
Declaration of Conformity based on tests conducted by Chomerics Test Services, Woburn, MA 01801, USA in
November, 1995. Test records are outlined in Chomerics Test Report #EMI0168A.95.
We hereby declare that the equipment specified conforms to the above Directives and Standards.
Carl Haapaoja, Director of Quality Assurance
Measurement Computing Corporation
10 Commerce Way
Suite 1008
Norton, Massachusetts 02766
(508) 946-5100
Fax: (508) 946-9500
E-mail: info@mccdaq.com
www.mccdaq.com
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