CIO-DAS48-I
Analog Current Input
User’s Guide

Document Revision 1A, January, 2011
© Copyright 2011, Measurement Computing Corporation

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Other product and company names mentioned herein are trademarks or trade names of their respective
companies.
© 2011 Measurement Computing Corporation. All rights reserved. No part of this publication may bereproduced, stored in a retrieval system, or transmitted, in any form by any means, electronic, mechanical, byphotocopying, recording, or otherwise without the prior written permission of Measurement Computing
Corporation.
NoticeMeasurement 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 that, 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 ininjury. 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 ofpeople.

HM CIO-DAS48-I.doc

3

4

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? ............................................................................................... 8Hardware .......................................................................................................................................................................... 8

Additional documentation .................................................................................................................................. 8
Optional components .......................................................................................................................................... 8
Unpacking the CIO-DAS48-I ............................................................................................................................. 9
Installing the software ........................................................................................................................................ 9
Configuring the CIO-DAS48-I ........................................................................................................................... 9Base address...................................................................................................................................................................... 9Wait 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 .......................................................................................................... 11Connectors, 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 ..................................................................................................................................................... 15Power consumption .......................................................................................................................................... 15
Environmental .................................................................................................................................................. 15
Main connector and pin out .............................................................................................................................. 16

5

Preface

About this User's Guide
What you will learn from this user's guideThis user's guide explains how to install, configure, and use the CIO-DAS48-I board so that you get the mostout of its analog current input features. This user's guide also refers you to related documents available on ourweb 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 arereading.
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
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-DAS48PGA and CIO-DAS48-I. This document is available on our website atwww.mccdaq.com/registermaps/RegMapCIO-DAS48-PGA-I.pdf.

6

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 thevoltage 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 withorders 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 tothe Quick Start Guide that shipped with your device.

7

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 Fieldwiring, signal termination, and conditioning on page 12 for a complete list of compatible accessory
products.
8CIO-DAS48-I User's Guide

Installing the CIO-DAS48-I

Unpacking the CIO-DAS48-I
As with any electronic device, you should take care while handling to avoid damage from staticelectricity. Before removing the CIO-DAS48-I from its packaging, ground yourself using a wrist strap or bysimply 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 byphone, 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 DataAcquisition Software CD. This booklet is available in PDF at www.mccdaq.com/PDFmanuals/DAQ-SoftwareQuick-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 theswitches and jumpers. Run InstaCal before you open your computer and install the board. The CIO-DAS48-I isshipped with the factory-default settings listed below.
Factory-configured default settings
Switch/jumper description

Default setting

Base address DIP switch
Wait State jumper
DIFF/SINGLE (input mode) switch
Mode V-I jumper (voltage or current type)300h (768 decimal)
Off (disabled)"24 DIFF" position – do not change"I" (current) – do not change

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-Iboard.

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 thecorrect 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 baseaddress of 300 hex.

9

CIO-DAS48-I User's Guide

Installing the CIO-DAS48-I

98765432SWA9A8A7A6A5A4A3A2HEX200
10080
40
20
1008
04Figure 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 waitstate causes the personal computer's bus transfer rate to slow down whenever CIO-DAS48-I is written to orread from. This jumper is shown in Figure 2 configured for OFF (wait state is disabled).

ON

O
FF

WAIT
STATE

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 isconfigured for current inputs, so set this jumper for I (Figure 3). Move the jumper from V to I only if you haveinstalled the CIO-DAS48-ISIP kit.

MODEVI

Figure 3. Input type jumper

10

CIO-DAS48-I User's Guide

Installing the CIO-DAS48-I

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.

24DIFF48
SINGLE

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 previoussection. Refer to the Quick Start Guide that came with your board www.mccdaq.com/PDFmanuals/DAQSoftware-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
Connector typeCompatible cableCompatible accessory products with
the C50FF-x cable

50-pin header connector
C50FF-x
CIO-MINI50
CIO-SPADE50

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-DAS48-I User's Guide

Installing the CIO-DAS48-I

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 thecomputer through the expansion backplate.
LLGNDCH 23 IN LO
CH 22 IN LO
CH 21 IN LO
CH 20 IN LO
CH 19 IN LO
CH 18 IN LO
CH 17 IN LO
CH 16 IN LO
CH 15 IN LO
CH 14 IN LO
CH 13 IN LO
CH 12 IN LO
CH 11 IN LO
CH 10 IN LO
CH 9 IN LO
CH 8 IN LO
CH 7 IN LO
CH 6 IN LO
CH 5 IN LO
CH 4 IN LO
CH 3 IN LO
CH 2 IN LO
CH 1 IN LO
CH 0 IN LO

5048464442403836343230282624222018161412108642494745434139373533312927252321191715131197531LLGND
CH 23 IN HI
CH 22 IN HI
CH 21 IN HI
CH 20 IN HI
CH 19 IN HI
CH 18 IN HI
CH 17 IN HI
CH 16 IN HI
CH 15 IN HI
CH 14 IN HI
CH 13 IN HI
CH 12 IN HI
CH 11 IN HI
CH 10 IN HI
CH 9 IN HI
CH 8 IN HI
CH 7 IN HI
CH 6 IN HI
CH 5 IN HI
CH 4 IN HI
CH 3 IN HI
CH 2 IN HI
CH 1 IN HI
CH 0 IN HI

Figure 5. I/O connector pin-out

Current connections are made between CH# HI and CH# LOW. The positive terminal of the current to bemeasured must be connected to CH# HI (refer to Current loop measurements on page 13).
Cabling215049

The red stripe
identifies pin # 150-pin Female
IDC Connector

21504950-pin Female
IDC connector

Figure 6. C50FF-x cable

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 atwww.mccdaq.com/products/screw_terminal_bnc.aspx.
12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.
2-wire, 4 - 20 mADevice

CIO-DAS48-I
CH 0 IN HI
24V +CH 0100
CH 0 IN LO

LLGND

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 thisconfiguration — the 24 V supply connection, direct to the input, violates the common mode range input
specification of the CIO-DAS48-I.

CIO-DAS48-I
CH 0 IN HI

24V +100

CH 02-wire,
4 - 20 mA

CH 0 IN LO

LLGND

DeviceFigure 8. Grounded device configuration – Caution – DO NOT USE!

13CIO-DAS48-I User's Guide

Functional Details

Three-wire devices
Figure 9 shows a three-wire, 4 to 20 mA device connected to channel 0 of the CIO-DAS48-I. Three-wiredevices will typically specify the maximum load resistance for the current output. The input resistance of theCIO-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 of1 kΩ3-wire,
4 - 20 mADevice

CIO-DAS48-I
CH 0 IN HI

24V +CH 0100CH 0 IN LO

LLGND

Figure 9. Connecting a three-wire device

14Chapter 4

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

A/D converter type
Resolution
Number of channels
Input type
Input ranges
Polarity
A/D pacing
Data transfer
A/D conversion timeThroughput
Accuracy
Differential Linearity error
Integral Linearity error
No missing codes guaranteed
Gain drift (A/D specs)
Zero drift (A/D specs)
Common mode range
CMRR

AD574
12 bits24Current input
4 to 20 mA, 2 to 10 mA, 1 to 5 mA and 0.5 to 2.5 mA, software selectable
Unipolar/Bipolar, software selectable
Software polled
Software polled
25 µs
20 kS/s, PC dependent±0.01% of reading ±1 LSB±1 LSB±0.5 LSB
12 bits±25 ppm/°C±10 µV/°C
±10 V
72 dB
100 nA

Input leakage current (@ 25 C)
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 mA100% / 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

Power consumption
Table 2. Power consumption specifications+5 V

620 mA typical, 800 mA max

Environmental
Table 3. Environmental specifications
Operating temperature range
Storage temperature range
Humidity

0 to 50 °C-20 to 70 °C
0 to 90% non-condensing

15

CIO-DAS48-I User's GuideSpecifications

Main connector and pin out
Table 4. Main connector specifications
Connector typeCompatible cableCompatible accessory products with theC50FF-x cable

50-pin D type connector
C50FF-x
CIO-MINI50
CIO-SPADE50
Table 5. Connector pin outPin5048464442403836343230282624222018161412108642Signal name
LLGND
CH 23 IN LO
CH 22 IN LO
CH 21 IN LO
CH 20 IN LO
CH 19 IN LO
CH 18 IN LO
CH 17 IN LO
CH 16 IN LO
CH 15 IN LO
CH 14 IN LO
CH 13 IN LO
CH 12 IN LO
CH 11 IN LO
CH 10 IN LO
CH 9 IN LO
CH 8 IN LO
CH 7 IN LO
CH 6 IN LO
CH 5 IN LO
CH 4 IN LO
CH 3 IN LO
CH 2 IN LO
CH 1 IN LO
CH 0 IN LO

Pin49474543413937353331292725232119171513119753116Signal name
LLGND
CH 23 IN HI
CH 22 IN HI
CH 21 IN HI
CH 20 IN HI
CH 19 IN HI
CH 18 IN HI
CH 17 IN HI
CH 16 IN HI
CH 15 IN HI
CH 14 IN HI
CH 13 IN HI
CH 12 IN HI
CH 11 IN HI
CH 10 IN HI
CH 9 IN HI
CH 8 IN HI
CH 7 IN HI
CH 6 IN HI
CH 5 IN HI
CH 4 IN HI
CH 3 IN HI
CH 2 IN HI
CH 1 IN HI
CH 0 IN HI

Measurement Computing Corporation
10 Commerce Way
Suite 1008
Norton, Massachusetts 02766(508) 946-5100
Fax: (508) 946-9500
E-mail: info@mccdaq.com
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