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CIO-DAS48-I
Analog Current Input
User’s Guide
Document Revision 1, January, 2011
© Copyright 2011, Measurement Computing Corporation
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HM CIO-DAS48-I.doc
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Table of Contents
Preface
About this User's Guide ....................................................................................................................... 6
What you will learn from this user's guide ......................................................................................................... 6
Conventions in this user's guide ......................................................................................................................... 6
Where to find more information ......................................................................................................................... 6
Chapter 1
Introducing the CIO-DAS48-I ............................................................................................................... 7
Overview: CIO-DAS48-I features ...................................................................................................................... 7
Software features ................................................................................................................................................ 7
Chapter 2
Installing the CIO-DAS48-I ................................................................................................................... 8
What comes with your CIO-DAS48-I shipment? ............................................................................................... 8
Hardware .......................................................................................................................................................................... 8
Additional documentation .................................................................................................................................. 8
Optional components .......................................................................................................................................... 8
Unpacking the CIO-DAS48-I ............................................................................................................................. 9
Installing the software ........................................................................................................................................ 9
Configuring the CIO-DAS48-I ........................................................................................................................... 9
Base address...................................................................................................................................................................... 9
Wait state ................................................................................................................................ .........................................10
Input type (V-I) ................................................................................................................................................................10
Input mode (DIFF/SINGLE) ................................................................................................ ............................................11
Installing the CIO-DAS48-I ............................................................................................................................. 11
Connecting the board for I/O operations .......................................................................................................... 11
Connectors, cables – main I/O connector ........................................................................................................................11
Field wiring, signal termination, and conditioning ..........................................................................................................12
Chapter 3
Functional Details ............................................................................................................................... 13
Current loop measurements .............................................................................................................................. 13
Two-wire devices .............................................................................................................................................................13
Three-wire devices ...........................................................................................................................................................14
Chapter 4
Specifications ...................................................................................................................................... 15
Analog input ..................................................................................................................................................... 15
Power consumption .......................................................................................................................................... 15
Environmental .................................................................................................................................................. 15
Main connector and pin out .............................................................................................................................. 16
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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-DAS48-I board so that you get the most
out of its analog current input 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
The following conventions are used in this manual to convey special information:
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.
Preface
< : > 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
For additional information relevant to the operation of your hardware, refer to the Documents subdirectory
where you installed the MCC DAQ software (C:\Program Files\Measurement Computing\DAQ by default), or
search for your device on our website at www.mccdaq.com.
If you need to program at the register level in your application, refer to the Register Map for the CIO-DAS48-
PGA and CIO-DAS48-I. This document is available on our website at
www.mccdaq.com/registermaps/RegMapCIO-DAS48-PGA-I.pdf.
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Chapter 1
Introducing the CIO-DAS48-I
Overview: CIO-DAS48-I features
The CIO-DAS48-I is a CIO-DAS48-PGA board with six SIP resistors installed. These resistors convert the
voltage inputs on the CIO-DAS48-PGA to current inputs.
The CIO-DAS48-I provides 24 current inputs. The input mode is switch-selectable. Input ranges are softwareselectable for 4-20 mA, 2-10 mA, 1-5 mA, or 0.5-2.5 mA.
A DC/DC converter supplies stable ±15 V power to the analog circuitry. It is possible to construct the board
without the DC/DC converter. This reduces the cost but limits the ranges of analog inputs. It is available with
orders of 10 or more units. You can enable a wait state generator with an on-board jumper.
Software features
For information on the features of InstaCal and the other software included with your CIO-DAS48-I, refer to
the Quick Start Guide that shipped with your device.
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Chapter 2
Installing the CIO-DAS48-I
What comes with your CIO-DAS48-I shipment?
The following items are shipped with the CIO-DAS48-I.
Hardware
CIO-DAS48-I (ships as a CIO-DAS48-PGA with six SIP resistors installed near the 50-pin connector)
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). This booklet supplies a brief description of
the software you received with your CIO-DAS48-I and information regarding installation of that software.
Please read this booklet completely before installing any software or hardware.
Optional components
You can also order the following MCC product to use with your CIO-DAS48-I.
C50FF-x cable
Signal termination and conditioning accessories
MCC provides signal conditioning and termination products for use with the CIO-DAS48-I. Refer to Field
wiring, signal termination, and conditioning on page 12 for a complete list of compatible accessory
products.
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CIO-DAS48-I User's Guide Installing the CIO-DAS48-I
Switch/jumper description
Default setting
Base address DIP switch
300h (768 decimal)
Wait State jumper
Off (disabled)
DIFF/SINGLE (input mode) switch
"24 DIFF" position – do not change
Mode V-I jumper (voltage or current type)
"I" (current) – do not change
Unpacking the CIO-DAS48-I
As with any electronic device, you should take care while handling to avoid damage from static
electricity. Before removing the CIO-DAS48-I from its packaging, ground yourself using a wrist 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
Installing the software
Refer to the Quick Start Guide for instructions on installing the software on the Measurement Computing Data
Acquisition Software CD. This booklet is available in PDF at www.mccdaq.com/PDFmanuals/DAQ-Software-
Quick-Start.pdf.
Configuring the CIO-DAS48-I
The CIO-DAS48-I has a base address switch, an input mode switch, an input type jumper, and a wait state
jumper which you must set before installing the board in your computer.
The InstaCal calibration and test program included with the CIO-DAS48-I will show you how to set the
switches and jumpers. Run InstaCal before you open your computer and install the board. The CIO-DAS48-I is
shipped with the factory-default settings listed below.
Factory-configured default settings
Before installing the CIO-DAS48-I, verify that the board is configured with the settings that you want. Review
the following information to change the default configuration of a jumper or switch on the CIO-DAS48-I
board.
Base address
Before you install the CIO-DAS48-I in your computer, set the base address by using the dip switch labeled
ADDRESS located on the board. The easiest way to set the base address switch is to let InstaCal show you the
correct settings. However, if are already familiar with setting ISA base addresses, you may use the base address
switch description below to guide your base address selection.
Unless there is already another board in your system using address 300 hex (768 decimal), leave the switches as
they are set at the factory. The example shown in Figure 1 shows the settings for the factory-default base
address of 300 hex.
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CIO-DAS48-I User's Guide Installing the CIO-DAS48-I
SW
A9
A8
A7
A6
A5
A4
A3
A2
HEX
200
100
80
40
20
10
08
04
9 8 7 6 5 4 3 29 8 7 6 5 4 3 2
O
N
O
F
F
WAIT STATE
M
O
D
E
V
M
O
D
E
I
Figure 1. Base address switches
In the default configuration shown in Figure 1, addresses 9 and 8 are DOWN, and all others are UP.
Address 9 = 200 hex (512 decimal) and address 8 = 100 hex (256 decimal); when added together they equal
300 hex (768 decimal).
Disregard the numbers printed on the switch
When setting the base address, refer to the numbers printed in white on the printed circuit board.
Wait state
Enable the wait state jumper if you have a computer with an I/O bus transfer rate which is too fast for the CIODAS48-I, or if the board fails sporadically in random ways.
To enable the wait state, set the jumper to the ON position. This jumper is OFF by default. Enabling the wait
state causes the personal computer's bus transfer rate to slow down whenever CIO-DAS48-I is written to or
read from. This jumper is shown in Figure 2 configured for OFF (wait state is disabled).
Figure 2. Wait state jumper
Input type (V-I)
The jumper labeled MODE V-I sets the input type to either voltage (V) or current (I). The CIO-DAS48-I is
configured for current inputs, so set this jumper for I (Figure 3). Move the jumper from V to I only if you have
installed the CIO-DAS48-ISIP kit.
Figure 3. Input type jumper
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CIO-DAS48-I User's Guide Installing the CIO-DAS48-I
48
SINGLE
24
DIFF
Connector type
50-pin header connector
Compatible cable
C50FF-x
Compatible accessory products with
the C50FF-x cable
CIO-MINI50
CIO-SPADE50
Input mode (DIFF/SINGLE)
The differential/single ended mode switch (Figure 4) sets board logic for 48 single-ended or 24 differential
mode. The CIO-DAS48-I is configured for 24 current measurements, so set this switch for 24 DIFF.
Figure 4. Input mode switch
Installing the CIO-DAS48-I
After you configure the board's switches and jumpers, you can install the CIO-DAS48-I into your computer. To
install your board, follow the steps below.
Install the MCC DAQ software before you install your board
The driver needed to run your board is installed with the MCC DAQ software. Therefore, you need to install
the MCC DAQ software before you install your board. Refer to the Quick Start Guide for instructions on
installing the software.
1. Turn your computer off, open it up, and insert your board into an available ISA slot.
2. Close your computer and turn it on.
3. To test your installation and configure your board, run the InstaCal utility you installed in the previous
section. Refer to the Quick Start Guide that came with your board www.mccdaq.com/PDFmanuals/DAQ-
Software-Quick-Start.pdf for information on how to initially set up and load InstaCal.
Connecting the board for I/O operations
Connectors, cables – main I/O connector
The table below lists the board connector, applicable cables, and compatible accessory products.
Board connector, cables, and accessory equipment
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).
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CIO-DAS48-I User's Guide Installing the CIO-DAS48-I
LLGND 50
CH 23 IN LO 48
CH 22 IN LO 46
CH 21 IN LO 44
CH 20 IN LO 42
CH 19 IN LO 40
CH 18 IN LO 38
CH 17 IN LO 36
CH 16 IN LO 34
CH 15 IN LO 32
CH 14 IN LO 30
CH 13 IN LO 28
CH 12 IN LO 26
CH 11 IN LO 24
CH 10 IN LO 22
CH 9 IN LO 20
CH 8 IN LO 18
CH 7 IN LO 16
CH 6 IN LO 14
CH 5 IN LO 12
CH 4 IN LO 10
CH 3 IN LO 8
CH 2 IN LO 6
CH 1 IN LO 4
CH 0 IN LO 2
49 LLGND
47 CH 23 IN HI
45 CH 22 IN HI
43 CH 21 IN HI
41 CH 20 IN HI
39 CH 19 IN HI
37 CH 18 IN HI
35 CH 17 IN HI
33 CH 16 IN HI
31 CH 15 IN HI
29 CH 14 IN HI
27 CH 13 IN HI
25 CH 12 IN HI
23 CH 11 IN HI
21 CH 10 IN HI
19 CH 9 IN HI
17 CH 8 IN HI
15 CH 7 IN HI
13 CH 6 IN HI
11 CH 5 IN HI
9 CH 4 IN HI
7 CH 3 IN HI
5 CH 2 IN HI
3 CH 1 IN HI
1 CH 0 IN HI
The red stripe
identifies pin # 1
50-pin Female
IDC connector
50-pin Female
IDC Connector
1
2
49
50
2
50
1
49
Pinout – main I/O connector
The CIO-DAS48-I I/O connector is a standard 50-pin header connector that is accessible from the rear of the
computer through the expansion backplate.
Current connections are made between CH# HI and CH# LOW. The positive terminal of the current to be
measured must be connected to CH# HI (refer to Current loop measurements on page 13).
Cabling
Field wiring, signal termination, and conditioning
You can use the following cabling, screw termination, and signal conditioning products with the CIO-DAS48-I.
CIO-MINI50 – 50-pin screw terminal board
CIO-SPADE50 — 16" X 4" termination panel which mates with both 37-pin and 50-pin connectors.
Details on these products are available on our web site at
www.mccdaq.com/products/screw_terminal_bnc.aspx.
Figure 5. I/O connector pin-out
Figure 6. C50FF-x cable
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CH 0 IN HI
CH 0 IN LO
100
2-wire, 4 - 20 mA
Device
CH 0
LLGND
CIO-DAS48-I
+
24V
CH 0 IN HI
CH 0 IN LO
100
2-wire,
4 - 20 mA
Device
CH 0
LLGND
+
24V
CIO-DAS48-I
Chapter 3
Functional Details
Current loop measurements
The CIO-DAS48-I is configured for current loop measurements in the 4 to 20 mA range. Ranges of 2 to 10 mA,
1 to 5 mA and 0.5 to 2.5 mA are also possible but are less commonly used. A typical current loop system uses
24V to power the current loop. Current output devices are available in two-wire and three-wire configurations.
Use the figures below as guides in connecting devices to the CIO-DAS48-I.
Two-wire devices
The "floating device" configuration is required for most systems using two-wire devices due to the restriction
on common mode range for the CIO-DAS48-I. If the power supply were connected to the CIO-DAS48-I input,
as in a "grounded device" system, the common mode input range spec would be violated and inaccurate
measurements would result.
Figure 7 shows a "floating device" configuration for a two-wire, 4 to 20 mA device. This is the correct
configuration that ensures that the common mode range input specification is not violated.
Figure 7. Floating device configuration
Figure 8 below shows a "grounded device" configuration for a two-wire, 4 to 20 mA device. DO NOT USE this
configuration — the 24 V supply connection, direct to the input, violates the common mode range input
specification of the CIO-DAS48-I.
Figure 8. Grounded device configuration – Caution – DO NOT USE!
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CIO-DAS48-I User's Guide Functional Details
CH 0 IN HI
CH 0 IN LO
100
3-wire,
4 - 20 mA
Device
CH 0
LLGND
CIO-DAS48-I
+
24V
Three-wire devices
Figure 9 shows a three-wire, 4 to 20 mA device connected to channel 0 of the CIO-DAS48-I. Three-wire
devices will typically specify the maximum load resistance for the current output. The input resistance of the
CIO-DAS48-Iis 100 Ω (determined by the CIO-DAS48-ISIP installed). Add this value to any other load
resistances in the loop. Typically, the maximum resistance specified for three-wire devices is on the order of
1 kΩ
Figure 9. Connecting a three-wire device
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Parameter
Specification
A/D converter type
AD574
Resolution
12 bits
Number of channels
24
Input type
Current input
Input ranges
4 to 20 mA, 2 to 10 mA, 1 to 5 mA and 0.5 to 2.5 mA, software selectable
Polarity
Unipolar/Bipolar, software selectable
A/D pacing
Software polled
Data transfer
Software polled
A/D conversion time
25 µs
Throughput
20 kS/s, PC dependent
Accuracy
±0.01% of reading ±1 LSB
Differential Linearity error
±1 LSB
Integral Linearity error
±0.5 LSB
No missing codes guaranteed
12 bits
Gain drift (A/D specs)
±25 ppm/°C
Zero drift (A/D specs)
±10 µV/°C
Common mode range
±10 V
CMRR
72 dB
Input leakage current (@ 25 C)
100 nA
Input impedance
100 Ohms
Absolute maximum input voltage
±35 V
Noise distribution (Rate = 1-10 kHz, Average % +/- 2 bins, Average % +/- 1 bin, Average # bins)
4 to 20 mA
100% / 100% / 3 bins
2 to 10 mA
100% / 98.8% / 4 bins
1 to 5 mA
100% / 96.8% / 4 bins
0.5 to 2.5 mA
100% / 98.2% / 5 bins
+5 V
620 mA typical, 800 mA max
Operating temperature range
0 to 50 °C
Storage temperature range
-20 to 70 °C
Humidity
0 to 90% non-condensing
Specifications
Typical for 25°C unless otherwise specified.
Specifications in italic text are guaranteed by design.
Analog input
Table 1. Analog input specifications
Chapter 4
Power consumption
Table 2. Power consumption specifications
Environmental
Table 3. Environmental specifications
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CIO-DAS48-I User's Guide Specifications
Connector type
50-pin D type connector
Compatible cable
C50FF-x
Compatible accessory products with the
C50FF-x cable
CIO-MINI50
CIO-SPADE50
Pin
Signal name
Pin
Signal name
50
LLGND
49
LLGND
48
CH 23 IN LO
47
CH 23 IN HI
46
CH 22 IN LO
45
CH 22 IN HI
44
CH 21 IN LO
43
CH 21 IN HI
42
CH 20 IN LO
41
CH 20 IN HI
40
CH 19 IN LO
39
CH 19 IN HI
38
CH 18 IN LO
37
CH 18 IN HI
36
CH 17 IN LO
35
CH 17 IN HI
34
CH 16 IN LO
33
CH 16 IN HI
32
CH 15 IN LO
31
CH 15 IN HI
30
CH 14 IN LO
29
CH 14 IN HI
28
CH 13 IN LO
27
CH 13 IN HI
26
CH 12 IN LO
25
CH 12 IN HI
24
CH 11 IN LO
23
CH 11 IN HI
22
CH 10 IN LO
21
CH 10 IN HI
20
CH 9 IN LO
19
CH 9 IN HI
18
CH 8 IN LO
17
CH 8 IN HI
16
CH 7 IN LO
15
CH 7 IN HI
14
CH 6 IN LO
13
CH 6 IN HI
12
CH 5 IN LO
11
CH 5 IN HI
10
CH 4 IN LO
9
CH 4 IN HI
8
CH 3 IN LO
7
CH 3 IN HI
6
CH 2 IN LO
5
CH 2 IN HI
4
CH 1 IN LO
3
CH 1 IN HI
2
CH 0 IN LO
1
CH 0 IN HI
Main connector and pin out
Table 4. Main connector specifications
Table 5. Connector pin out
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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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