Measurement CIO-DAS16Jr16 User Manual

CIO-DAS16Jr/16

USER’S MANUAL

Revision 4

March, 2001

LIFETIME WARRANTY

Every hardware product manufactured by Measurement Computing Corp. is warranted against defects in materials or workmanship for
the life of the product, to the original purchaser. Any products found to be defective will be repaired or replaced promptly.

LIFETIME HARSH ENVIRONMENT WARRANTY

TM

Any Measurement Computing Corp. product which is damaged due to misuse may be replaced for only 50% of the current price. I/O
boards face some harsh environments, some harsher than the boards are designed to withstand. When that happens, just return the
board with an order for its replacement at only 50% of the list price. Measurement Computing Corp. does not need to profit from your
misfortune. By the way, we will honor this warranty for any other manufacture’s board that we have a replacement for!

30 DAY MONEY-BACK GUARANTEE

Any Measurement Computing Corp. product may be returned within 30 days of purchase for a full refund of the price paid for the
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RMA number first. No credits or returns accepted without a copy of the original invoice. Some software products are subject to a
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These warranties are in lieu of all other warranties, expressed or implied, including any implied warranty of merchantability or
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from the use of its products, even if Measurement Computing Corp. has been notified in advance of the possibility of such damages.

MEGA-FIFO, the CIO prefix to data acquisition board model numbers, the PCM prefix to data acquisition board model numbers,
PCM-DAS08, PCM-D24C3, PCM-DAC02, PCM-COM422, PCM-COM485, PCM-DMM, PCM-DAS16D/12, PCM-DAS16S/12,
PCM-DAS16D/16, PCM-DAS16S/16, PCI-DAS6402/16, Universal Library, InstaCal, Harsh Environment Warranty and
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Measurement Computing Corp. does not authorize any Measurement Computing Corp. product for use in life
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Life support devices/systems are devices or systems which, a) are intended for surgical implantation into the
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Measurement Computing Corp. products are not designed with the components required, and are not subject to
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(C) Copyright 2001, Measurement Computing Corp

HM CIO-DAS16Jr_16.lwp

TABLE OF CONTENTS

1 INSTALLATION

1.1 BASE ADDRESS

1.2 DMA LEVEL SELECT

1.3 8 OR 16 CHANNEL SELECT

1.4 INSTALLING THE BOARD

2 SIGNAL CONNECTIONS

2.1 CONNECTOR DIAGRAM

2.2 ANALOG INPUTS

2.2.1 Single-Ended Inputs

2.2.2 Differential Inputs

2.2.3 System Grounds and Isolation

2.2.4 Determine Your Ground Type

2.2.5 Systems with Common Grounds

2.2.6 Systems with Common Mode (ground offset) Voltages

2.2.7 Small Common Mode Voltages

2.2.8 Large Common Mode Voltages

2.2.9 CIO-DAS16Jr/16 and Signal Source Have Isolated Grounds

2.3 WIRING CONFIGURATIONS

2.3.1 Common Ground / Single-Ended Inputs

2.3.2 Common Ground / Differential Inputs

2.3.3 Common Mode Voltage < +/-10V/Single-Ended Inputs

2.3.4 Common Mode Voltage < +/-10V/Differential Inputs

2.3.5 Common Mode Voltage > +/-10V

2.3.6 Isolated Grounds / Single-Ended Inputs

2.3.7 Isolated Grounds / Differential Inputs

3 REGISTER ARCHITECTURE

3.1 CONTROL & DATA REGISTERS

3.2 A/D DATA & CHANNEL REGISTERS

3.3 CHANNEL MUX SCAN LIMITS REGISTER

3.4 4-BIT DIGITAL I/O REGISTERS

3.5 STATUS REGISTER

3.6 DMA, INTERRUPT & TRIGGER CONTROL

3.7 PACER CLOCK CONTROL REGISTER

3.8 ANALOG INPUT RANGE REGISTER

3.9 PACER CLOCK DATA & CONTROL REGISTERS

3.10 ANALOG INPUT

3.11 DIGITAL INPUT & OUTPUT

3.12 OUTPUT

3.13 INPUT

4 SPECIFICATIONS

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1.1 SOFTWARE

1 INSTALLATION

Before installing the board, install and run
with your board.
regarding these settings can be found below. Refer to the
instructions.

The CIO-DAS16Jr/16 has one bank of base address-select switches and two single-function switches which must be set
before installing the board in your computer.

Cal will guide you through switch and jumper settings for your board. Detailed information

Insta

Cal. This package is the installation, calibration and test utility included

Insta

Software Installation

manual for

Cal installation

Insta

1.2 BASE ADDRESS

Unless there is already a board in your system that uses address 300
hex (768 decimal), leave the switches as they were set at the factory.
In the example shown in Figure 1-1, the board is set for base address
300h (768 decimal).

Figure 1-1 Base Address Switches

1.3 DMA LEVEL SELECT

The board is shipped with the DMA level switch set to DMA level 1. Unless you
have another board in your system using DMA level 1, leave the DMA level switch in
the level 1 position (Figure 1-2).

Some network boards use DMA and so do some IEEE-488 interface boards. If you
suspect a conflict with another board in the system, change the switch to level 3.

Figure 1-2. DMA Level Select Switch

1.4 8 or 16 CHANNEL SELECT

The analog inputs of the CIO-DAS16Jr/16 can be configured as 8 differential
or 16 single-ended. Using differential inputs allows up to 10 volts of common
mode (ground loop) rejection.

The CIO-DAS16Jr/16 comes from the factory configured for eight differential
inputs. Set it for the number of inputs (and type) you require (Figure 1-3).

Figure 1-3. Channel Number Select Switch

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1.5 INSTALLING THE BOARD

Having configured the board’s switches and jumpers, it is now time to install the board into an ISA slot in the PC.

1. Turn the power off.

2. Remove the cover of your computer. Please be careful not to dislodge any of the cables installed on the boards in your
computer as you slide the cover off.

3. Locate an empty ISA expansion slot in your computer.

4. Push the board firmly down into the expansion bus connector. If it is not seated fully it may fail to work and could
short circuit the PC bus power onto a PC bus signal. This could damage the motherboard or the circuit board.

5. Turn the PC power back on and verify proper installation by running

Manual

for information on running

Insta

Cal.

Cal Test (refer to the

Insta

Software Installation

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2 SIGNAL CONNECTIONS

/

2.1 CONNECTOR DIAGRAM

The CIO-DAS16Jr/16 analog connector is a male 37-pin, D-type connector accessible from the rear of the PC through the
expansion backplate. The signals available are identical to the DAS-16, with the exception of pins 8, 9, 10 and 27 (D/A
signals on the DAS-16, no-connect on the CIO-DAS16Jr/16). Another signal, SS&H OUT, can be accessed at pin 26.

CTR0 GATE

Figure 2-1. Connector Pin-Out

The connector (Figure 2-1) accepts female 37-pin D-type connectors, such as those on the C73FF-2, a 2-foot cable with
connectors.

If frequent changes to signal connections or signal conditioning is required, please refer to the information on the
CIO-MINI37 or CIO-TERMINAL screw terminal boards.

For signal conditioning and channel expansion, refer to the information on CIO-EXP32, a 32 channel analog
multiplexer/amplifier; CIO-SSH16, a 16 channel simultaneous sample & hold board or the ISO-RACK16 5B module
interface rack.

2.2 ANALOG INPUTS

Making reliable, trouble-free analog signal connections can be a challenge when using a data acquisition board. The best
method for inputting analog inputs may not be obvious. While a complete coverage of this topic is beyond the scope of
this manual, the following section provides simple explanations and helpful hints. When finished, you should have a
basic understanding of single-ended versus differential inputs and the concepts of system grounding and isolation.

The CIO-DAS16Jr/16 provides either eight differential or 16 single-ended input channels. Descriptions of single-ended
and differential inputs follow.

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2.2.1 Single-Ended Inputs

In a single-ended input circuit, the voltage
between the input signal terminal and ground is
amplified. In this mode, the CIO-DAS16JR/16
amplifies the voltage between the selected input
channel CH IN and LLGND. The single-ended
input configuration requires only one physical
connection (wire) per channel and allows the
CIO-DAS16JR/16 to monitor more channels
than the (2-wire) differential configuration using
the same connector and on-board multiplexer
(not shown). However, since the circuit is
measuring the input voltage relative to its own
low level ground, single-ended inputs are more
susceptible to both EMI (Electro Magnetic
Interference) and any ground noise at the signal
source. Figure 2-2 shows the single-ended input
configuration.

Figure 2-2. Single-Ended Input Theory

2.2.2 Differential Inputs

In differential input circuits, the voltage between
two distinct input signals is amplified. Within a
certain range (referred to as the common mode
range), the measurement is almost independent of
signal source to CIO-DAS16JR/16 ground
variations. A differential input is also much more
immune to EMI than a single-ended one. Most EMI
noise induced in one lead is also induced in the
other, the input only measures the difference
between the two leads, and the EMI common to
both is ignored. This effect is a major reason there
is twisted pair wire as the twisting assures that both
wires are subject to virtually identical external
influence. Figure 2-3 shows a theoretical
differential input configuration. Note: Multiplexing
is not shown for simplification.

Figure 2-3. Differential Input Theory

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