Measurement CIO-DO24DD User Manual

CIO-DO24DD

&

CIO-DO48DD

User’s Manual

Revision 5

November, 2000

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TABLE OF CONTENTS

1.0 INTRODUCTION

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2.0 SOFTWARE INSTALLATION

3.0 HARDWARE INSTALLATION

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4.0 INTERFACING

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5.0 CONTROL & DATA REGISTERS

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6.0 SPECIFICATIONS

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1

11.1 DIRECT DRIVE

11.2 DARLINGTON TRANSISTORS

11.3 CLAMPING VOLTAGE
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23.1 BASE ADDRESS

43.2 INSTALLING IN THE COMPUTER
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54.1 CONNECTOR DIAGRAMS

64.2 CABLING TO THE CONNECTOR

64.3 CONNECTOR PIN ASSIGNMENTS

64.4 THE OUTPUT CIRCUIT

74.5 SIGNAL CONNECTION

84.6 CLAMPING VOLTAGE INPUT

94.7 TEST CONNECTIONS

10

105.1 INTRODUCTION

115.2 REGISTER FORMATS - BOTH 24- AND 48-BIT VERSIONS

115.3 REGISTER FORMAT-CIO-DO48DD, CONNECTOR P2 ONLY
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This page is blank.

1.0 INTRODUCTION

CIO-DO24DD and CIO-DD48DD are desig ned for switching circuits of higher
voltage and current than standard TTL type components are capable of. They provide
24 and 48 outputs respectively.

The ‘DD’ designation indicates that these boards are capable of ‘Direct Drive.’ The
current specification that earns the direct drive designation is a switching capacity of
up to 500 mA.

Throughout this manual the part number CIO-DO24DD is used for both products
since most of information applies to both. Where necessary, the appropriate part
number is noted.

Both the CIO-DO24DD and the CIO-DD48DD are s upported by the Universal
Library programming library for DOS and Windows available from Measurement
Computing.

1.1 DIRECT DRIVE

The CIO-DO24DD is similar to a set of non-isolated solid state relays. The digital
lines of the DD are capable of completing a circuit to ground thereby allowing current
to flow in the circuit. Because there is a small amount of OFF current flowing in the
circuit, like a solid state relay, the circuits on a DD board are not ideal for switching
low level signals. If you have a circuit that is suitable for solid state relays and does
not need isolation, the DD board can be substituted.

1.2 DARLINGTON TRANSISTORS

Each output is an NPN Darlington pair. All outputs are open collector and incorporate
clamping diodes for transient suppression. The ability to withstand transients, connect
directly to voltages up to 50V and sink as much as 500 mA make these outputs ideally
suited for controlling lamps, relays, printer hammers and similar loads.

1.3 CLAMPING VOLTAGE

The clamping voltage is th at voltage which, when exceeded, is clam ped to prev ent
damage to th e circuit. The clamping voltage of each 8-bit port can be set
independently and must be supplied externally. In addition, the open collector points
of each 8-bit port can be pulled to a common voltage by connecting an eight-resistor
SIP.

1

2.0 SOFTWARE INSTALLATION

On the disk labeled InstaCal there is an installation program. Please run this program
and accept the defaults. Refer to th e Extended Software Installation Manual for
complete instructions. If you have purchased the Universal L ibrary for programming
language support, use that disk to install both InstaCal and the Universal Library.

InstaCal will guide you through switch and jumper settings you may need to make
before installing y our board. Detailed information on hardware settings is also
provided below.

3.0 HARDWARE INSTALLATION

3.1 BASE ADDRESS

The boards are setup at the factory with the base address set to 300h (768 decimal). If
there are no other devices installed in your computer that are using addresses 300h
through 304h (or 308h if using the CIO-DO48DD), do not change the base address.

The CIO-DO24DD employs the PC bus for power, communications and data transfer.
As such it draw s power from the PC, monitors the address lines and control signals
and responds to it’s I/O address, and places data on the eight data lines.

The BASE address is the only user selectable bu s related feature of the
CIO-DO24DD. The base address identifies the registers that software writes to when
communicating with the CIO-DO24DD.

A block of eight (or seven) DIP switches are used for setting the base address. Each
switch position corresponds to one of the PC bus address lines. Placing a switch down
asserts that address bit.

A complete address is constructed by calculating the HEX or decimal number which
corresponds to all the address bits the board has been instructed to respond to. For
example, in Figure 3-1, (for CIO-DO24DD) address switches 9 and 8 for are DOWN,
all others UP. See Figure 3-2 for the address select switches for the CIO-DO48DD.
Address 9 = 200h (512D) and address 8 = 100h (256 decimal), when added together
they equal 300h (768 decimal).

2