Measurement CIO-DAS16M1 User Manual

CIO-DAS16/M1

User’s Manual

Revision 4
May, 2000

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Measurement Computing Corp.

Table of Contents

1. SOFTWARE INSTALLATION.........................................................................................................................................................1

2. HARDWARE INSTALLATION........................................................................................................................................................1

2.1 BASE ADDRESS............................................................................................................................................................................1

2.2 USER-COUNTER CLOCK/CHAINING JUMPERS......................................................................................................................2

2.3 PACER CLOCK SOURCE SELECT JUMPER..............................................................................................................................2

2.4 INSTALLING THE CIO-DAS16/M1 IN THE COMPUTER.........................................................................................................3

2.5 PROGRAMMABLE RANGE AND GAIN SETTING...................................................................................................................3

3. SIGNAL CONNECTIONS..................................................................................................................................................................4

3.1 INTRODUCTION ...........................................................................................................................................................................4

3.2 ANALOG CONNECTOR DIAGRAM............................................................................................................................................4

3.2.1 Analog Inputs............................................................................................................................................................................5

3.2.2 Connecting Analog Inputs.........................................................................................................................................................5

1.1.3 Shielding ...................................................................................................................................................................................5

1.1.4 Grounded Signal Source........................................................................................................................................................... 5

1.1.5 Floating Signal Source..............................................................................................................................................................6

1.1.6 Avoiding Ground Loops............................................................................................................................................................6

1.3 DIGITAL OUTPUTS & INPUTS....................................................................................................................................................7

1.3.1 Digital Output Connector .........................................................................................................................................................7

1.3.2 Counter Clock Jumper..............................................................................................................................................................7

1.3.3 Cabling the Digital Connector..................................................................................................................................................7

4. REGISTER ARCHITECTURE........................................................................................................................................................10

4.1 DATA TRANSFERS.....................................................................................................................................................................10

4.2 FIFO DATA BUFFER...................................................................................................................................................................10

4.3 CHANNEL/GAIN QUEUE...........................................................................................................................................................10

4.4 CHANNEL/GAIN MEMORY CONTENTS REGISTER.............................................................................................................11

4.5 DT-CONNECT..............................................................................................................................................................................12

4.6 CONTROL & DATA REGISTERS...............................................................................................................................................12

4.6.1 A/D Data & Channel Registers...............................................................................................................................................14

4.6.2 Control & Status Bits..............................................................................................................................................................14

4.6.3 Four-Bit Digital I/O Registers................................................................................................................................................15

4.6.4 Clear Interrupt Status Register...............................................................................................................................................16

4.6.5 Interrupt Control, Pacer Source Register...............................................................................................................................16

4.6.6 Channel Gain Queue Address Register...................................................................................................................................17

4.6.7 Channel Gain Queue Data Register........................................................................................................................................18

4.6.8 Total Counter Data & Control Registers................................................................................... .............................................19

4.6.9 Digital I/O and Counter Control & Data Registers ...............................................................................................................20

4.6.10 82C55 Digital I/O Registers..................................................................................................................................................21

4.6.11 COUNTER CHIP (82C54)....................................................................................................................................................23

5. SPECIFICATIONS............................................................................................................................................................................24

6. ELECTRONICS AND INTERFACING..........................................................................................................................................27

6.1 COMMON MODE.........................................................................................................................................................................27

6.2 COMMON MISUNDERSTANDINGS.........................................................................................................................................28

6.3 GROUND

LOOPS.........................................................................................................................................................................28

6.4 PULL UP & PULL DOWN RESISTORS.....................................................................................................................................28

6.5 TTL TO SOLID STATE RELAYS................................................................................................................................................29

6.6 VOLTAGE DIVIDERS.................................................................................................................................................................30

6.7 LOW PASS FILTERS ...................................................................................................................................................................32

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1. SOFTWARE INSTALLATION

The board has a variety of switches and jumpers to set before installing the board in your computer. By
far the simplest way to configure your board is to use the InstaCal
software package. InstaCal

TM

will show you all available options, how to configure the various switches

TM

program provided as part of your

and jumpers to match your application requirements, and will create a configuration file that your
application software (and the Universal Library) will refer to so the software you use will automatically
know the exact configuration of the board.

Please refer to the Software Installation Manual regarding the installation and operation of InstaCal
The following hard copy information is provided as a matter of completeness, and will allow you to set
the hardware configuration of the board if you do not have immediate access to InstaCal

TM

and/or your

TM

.

computer

2. HARDWARE INSTALLATION

The CIO-DAS16/M1 has one bank of base address switches and four jumpers to set before installation of
the board in your computer.

2.1 BASE ADDRESS

Unless there is already a board in your system which uses address 300h (768 decimal), leave the switches
as they are set at the factory. In the example shown in Figure 2-1, the CIO-DAS16/M1 is set for base
address 300h.

Figure 2-1. Base Address Switch

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2.2 USER-COUNTER CLOCK/CHAINING JUMPERS

The CIO-DAS16/M1 has three counters available to the user at the digital connector, P5. (A fourth
counter is available at the analog connector, P1.) The three digital-connector counters are associated with
registers Base + 404, +405, and +406.
User-Counter 0 can be externally clocked by a jumper at JB2. It is adjacent to the digital connector and
connects the internal 10 MHz OSC signal to Counter 0 clock input (Figure 2-2). Using two additional
jumpers at JB2, the counters can be chained 0 to1, and 1 to 2 to yield counters of 32 or 48 bits. These
counters can also be chained externally at the 40-pin digital connector, P5.

JB2

The on-board 10 MHz OSC signal can be connected

C0 (CLK 0)
O0 (OUT 0)
C1 (CLK 1)
O1 (OUT 1)
C2 (CLK 2)

Figure 2-2. User-Counter Clock Source and Chaining Jumpers

directly to the clock of CTR 0 by jumping OSC to C0.

The output of CTR 0 (O0) can be chained directly to
the clock of CTR 1 (C1).

The output of CTR 1 (O1) can be chained directly to
the clock of CTR 2 (C2).

2.3 PACER CLOCK SOURCE SELECT JUMPER

When using the internal clock for pacing, select the desired frequency of the source supplied to the pacer
counters by setting the XTAL jumper for either 1 or 10 MHz (Figure 2-3). In most cases, 10MHz is the
appropriate choice. Use the 1MHz option only if you are using the CIO-DAS16/M1 with software
designed for the DAS16 (which would calculate pacer speed based on a 1MHz sourc to the pacer
counters).

1 MHz

10
XTAL

Figure 2-3. Pacing Counter Frequency-Select Jumper

2

2.4 INSTALLING THE CIO-DAS16/M1 IN THE COMPUTER

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 expansion slot in your computer. If you plan to use the 24 bits of digital or three
counters accessible through the rear connector, you should install the board in a slot with an available
adjacent slot for the BP40-37 connector-cable-backplate assembly.

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
in your PC or the board.

2.5 PROGRAMMABLE RANGE AND GAIN SETTING

The analog input range is fully programmable. There are no switches to set.
The board has a channel/gain queue, that is programmed to align a channel and gain in a programmed
channel scan sequence. Channel/Gain queue loading is handled by the Universal Library programming
language library and by application programs which support the CIO-DAS16/M1.

Setting the channel gain queue is required prior to making any measurements with the CIO-DAS16/M1 so
the concept of a default range value is meaningless.

3

3. SIGNAL CONNECTIONS

3.1 INTRODUCTION

There are three connectors on th CIO-DAS16/M1. The 37-pin connector, P1, on the rear mounting plate is
primarily for analog signals. It is referred to as the analog connector. The 40-pin header connector, P5, at
the front of the board has 24 digital I/O lines. It also has clock, gate, and output signals for three counters
associated with registers Base + 404, +405, and +406. It is referred to as the digital connector.
The DT-Connect connector (P4) at the top of the board is included primarily for use with the MEGA­FIFO huge sample buffer, which may be required to attain the maximum acquisition rate.

3.2 ANALOG CONNECTOR DIAGRAM

The CIO-DAS16/M1 analog connector is a 37-pin, D-type connector accessible from the rear of the PC
on the expansion backplate. The connector accepts female 37-pin D-type connectors, such as the C37FF­2, a 2-foot cable. The Counter 0 signals are associated with the register at Base + C.
The CTR 2 OUT signal is the internal PACER sign al (reg is ters at Base + D, +E, and +F.)

Figure 3-1. Analog Connector Pin Out

If frequent changes to signal connections or signal conditioning is required, please refer to the information
on the CIO-MINI37, CIO-TERMINAL, or SCB-37 screw terminal board.

4

3.2.1 Analog Inputs

The CIO-DAS16/M1 has eight differential analog input channels. Each channel has a signal-high input
and a signal-low input. The measurement made by the A/D is the voltage difference between the LOW
and HIGH inputs. Differential inputs have a common mode range (see application note). The CIO­DAS16/M1 can have as much as 10V of common mode voltage between LLGND and signal LOW.

CAUTION
Measure the voltage between the ground signal at the signal source and the PC. Use a voltmeter and
place the red probe on the PC ground and the black probe on the signal ground. If there is more than 10
volts, do not connect the CIO-DAS16/M1 to this signal source because you will not be able to make any
reading. If the voltage is over 20V, DO NOT connect this signal because it will damage the board .

3.2.2 Connecting Analog Inputs

Connect analog inputs as shown in Figure 3-2 below. Pay close attention to cabling and grounding of the
shield.

NOTE: Failure to cable as recommended will cause less than perfect readings. Perform signal wiring with
consideration to the high speeds involved. Even if your A/D pacing rate is not high, the converter is
always converting at less than 1µs and the internal MUX switching is done at a similar high speed.

NOTE: Keep high and low wires together. Keep the signal wires for a channel together. Ideally, they
should be a twisted pair. This will aid the differential inputs in rejecting EMI or RFI from input signals.

Failure to cable as shown will result in signal noise

.

3.2.3 Shielding

To further protect the input signals from noise, use shielded cable. Shielded twisted-pair cable is readily
available. Connect the shield as in the diagrams below or ground loops and signals noise may result.

3.2.4 Grounded Signal Source

A grounded signal source has the low signal referenced to chassis ground. If an instrument has only two
poles, HI and LOW, it is probably referenced to chassis ground internally. Check with an Ohmmeter
between LOW and the power cord ground prong. If an instrument has three poles, a HI, LOW and GND,
you can strap LO to GND as shown here, or use the connection for Floating Signal Source.

5

Instrument

Signal High

Signal Low

Tie Low to GND

CIO-DAS16/M1/16

Shielded Cable

Channel # High
Channel # Low

GND

GROUNDED SIGNAL SOURCE - Suggested way to connect
signal and cable shield. Ground is completed through
power ground. Voltage between outlet grounds not to
exceed the common mode range.

LLGND

Figure 3-2. Cable Shield Grounding

3.2.5 Floating Signal Source

A floating signal source is defined as the low signal having no reference to earth ground (PC Chassis
ground or LLGND). Examples are a battery, an isolated precision power supply or a sensor which is not
earth grounded. See Figure 3-3 for a connection diagram.

Shielded
Cable

Signal High

Signal Low

CIO-DAS16/M1/16

Channel # High
Channel # Low

10K

LLGND

FLOATING SIGNAL SOURCE - Suggested way to connect signals
and cable shield. Connection is made to Earth ground through
power ground.

Figure 3-3. Floating Signal Source Referenced to Ground

A reference between signal LOW and LLGND must be provided bec ause board inputs are differential.
Failure to supply the reference (10K resistor) will result in unrepeatable readings.

3.2.6 Avoiding Ground Loops

Figure 3-4 shows the wrong way to connect a floating signal and create a ground loop. Any current
caused by a voltage potential between the grounds will be sufficient to interfere with signal readings

6

Instrument

Shielded Cable

Signal High

Signal Low

Ground Loop Created Here

WRONG WAY! - This is the wrong way to connect cable shield.

CIO-DAS16/M1/16

Channel # High
Channel # Low

LLGND

Figure 3-4. Wrong Way to Connect a Signal

3.3 DIGITAL OUTPUTS & INPUTS

All the digital outputs and inputs on the CIO-DAS16/M1 are TTL level. TTL is an electronics industry
term, short for Transistor Transistor Logic, which describes a standard for digital signals which are either
at 0V or 5V (nominal).
To control or sense any device other than TTL IC chips, please use appropriate signal conditioning, such
as solid state relays or electromechanical relays. See the Measurement Computing catalog for SSR­RACK24 and CIO-ERB24 interface accessories.

3.3.1 Digital Output Connector

A second connector at the rear of the board contains signals from one 82C55 and one 82C54. The 24 bits
of digital I/O (82C55) and nine counter/timer signals (from three counters of an 82C54) are available to
the user for on/off control, pulse width and frequency measurement and general counting.

The 82C54 is a 10MHz (max) down-counter chip having three 16-bit counters. The input, gate and output
signals of the counters are brought out to the connector and on-board clock-select and chaining jumpers.
Together, the 24 digital I/O, and the counters use eight I/O addresses. The lower four (Base + 400,
through +403 are used for the 82C55 digital I/O and the upper four (Base + 404 through +407) are used
for the 82C54 user-counter timer.

3.3.2 Counter Clock Jumper

The board has a row of three jumpers adjacent to P5 that allow the 10 MHz [XTAL] OSCillator signal to
be connected to counter 0 input, and the counters to be chained 0 to1, and 1 to 2. In this way, a counter of
32 or 48 bits can be constructed from the three 16-bit counters of the 82C54. The counters can also be
chained externally via the 40-pin connector.

3.3.3 Cabling the Digital Connector

The digital/counter connector is a 40-pin header located at the rear of the CIO-DAS16/M1 board. It is
pinned out such that when connected to a 37-pin connector via a BP40-37, the 37-pin connector's pin-outs
are nearly identical to that of the CIO-DIO24/CTR3 (Figure 3-5). When using the BP40-37, the
digital/counter I/O connector is a 37-pin D-type connector accessible from the rear of the PC through the

7

expansion backplate. If you need compatibility with this product, we recommend that you purchase the
BP40-37 cable when using the digital connector, P5.

If compatibility with the CIO-DIO24/CTR3 is not required, you can make direct connection to a CIO­MINI40 screw terminal board using a C40FF-2 cable.

The signals available are direct connections to an 82C55 digital I/O chip and an 82C54 counter chip.
Figure 3-5 is the pin out of a BP40-37 connected to the digital/counter connector.

Figure 3-6 is the pin out of P5.

Figure 3-5. Digital Connector - Pin Out of BP40-37

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