Measurement CIO-DAC0816 User Manual

CIO-DAC08/16

and

CIO-DAC16/16

User’s Manual

Revision 6

April, 2001

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 Measurement Computing Corporation are registered trademarks of Measurement
Computing Corporation.

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neither for its use; nor for any infringements of patents or other rights of third parties, which
may result from its use. No license is granted by implication or otherwise under any patent or
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or otherwise without the prior written permission of Measurement Computing Corporation.

Notice

Measurement Computing Corporation does not authorize any
Measurement Computing Corporation product for use in life support
systems and/or devices without the written approval of the President of
Measurement Computing Corporation Life support devices/systems are
devices or systems which, 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 in injury. Measurement Computing
Corp. products are not designed with the components required, and are
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(C) Copyright 2001, Measurement Computing Corporation

HM CIO-DAC##_16.lwp

Table of Contents

1.0 INTRODUCTION

2.0 SOFTWARE INSTALLATION

3.0 HARDWARE INSTALLATION

4.0 REGISTER ARCHITECTURE

5.0 SPECIFICATIONS

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1
1
2

23.1 BASE ADDRESS ...............................................

43.2 ANALOG OUTPUT RANGE JUMPERS ............................

43.3 UNIPOLAR/BIPOLAR INITIAL ZERO STATE JUMPER ..............

53.4 SIMULTANEOUS UPDATE JUMPER ..............................

63.5 INSTALLING THE BOARDS IN THE COMPUTER ..................

63.6 CABLING TO THE BOARD ......................................

73.7 SIGNAL CONNECTION .........................................

83.8 CONNECTOR DIAGRAM .......................................

9

94.1 CONTROL & DATA REGISTERS .................................

104.2 OUTPUT TRANSFER FUNCTIONS ..............................

12

This page is blank.

1.0 INTRODUCTION

The CIO-DAC16/16 is a 16-channel analog output board. The CIO-DAC08/16 is an
8-channel analog output board. The analog outputs are from AD660BNs with each
output buffered by an OP-27.

The analog outputs are controlled by writing a digital control word as two bytes to the
DAC's control register. The control register is double buffered so the DAC's output is
not updated until the second byte (the high byte) has been written.

The analog outputs may also be set for simultaneous update by selecting XFER on
jumper J18. This jumper applies to all DACs.

When the DACs are set for simultaneous update, writing new digital values to a
DAC's control register does not cause an update of the DAC's voltage output. Update
of the output occurs only after a READ from the board's addresses (any address from
base + 0 through base + 31, or through base +15 for the DAC08).

2.0 SOFTWARE INSTALLATION

The CIO-DAC##/16 is supplied with InstaCal. InstaCal is an installation, calibration
and test package. Use it to guide the installation procedure. InstaCal also creates a
configuration file required for programmers who have purchased the Universal
Library programming libraries. Refer to the Software Installation Manual for
complete instructions. If you decide not to use InstaCal as a guide, the information
required for configuring the board is provided in the following section.

1

3.0 HARDWARE INSTALLATION

The CIO-DAC16/16 and DAC08/16 each has one bank of range jumpers, a single
unipolar/bipolar jumper, one base address switch and a simultaneous update jumper
which must be set before installing the board in your computer. The InstaCal program
included with both boards shows how these switches are set. Run this program before

you open your computer.

We recommend you perform the software installation described in
sections below prior to installing the board in your computer. The

InstaCal

switches and jumpers on the board prior to physically installing the
board in your computer.

The CIO-DAC16/16 is setup at the factory with:

BASE ADDRESS 300h (768 decimal)
SIMULTANEOUS UPDATE In the UPDATE position. Single channel update.
ANALOG OUTPUT ±5V
UNI / BIP JUMPER BIP

3.1 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. The base address switch
for the CIO-DAC16/16 is shown
here, set to 300 hex. The
CIO-DAC08/16 has one additional
switch on the base address switch
bank (A4 with a weight of 10 hex).

TM

program provided will show yo u ho w to p rope rly set th e

Figure 3-1. Base Address Switches (Set to 300h)

The address switches may be set for a base address in the range of 000-3E0 (3F0 for
the DAC08) so it should not be hard to find a free address area. Once again, if you
are not using IBM prototyping cards or some other board which occupies these
addresses, then 300-31Fh are free to use. Addresses not specifically listed, such as
390-39F, are free.

Refer to table 3-1 for PC I/O address usage.

2

RANGE

070-071

Table 3-1. PC I/O Addresses

FUNCTIONHEX

CMOS RAM & NMI MASK (AT)

FUNCTIONHEX

RANGE

EGA2C0-2CF8237 DMA #1000-00F
EGA2D0-2DF8259 PIC #1020-021
GPIB (AT)2E0-2E78253 TIMER040-043
SERIAL PORT2E8-2EF8255 PPI (XT)060-063
SERIAL PORT2F8-2FF8742 CONTROLLER (AT)060-064
PROTOTYPE CARD300-30F
PROTOTYPE CARD310-31FDMA PAGE REGISTERS080-08F
HARD DISK (XT)320-32F8259 PIC #2 (AT)0A0-0A1
PARALLEL PRINTER378-37FNMI MASK (XT)0A0-0AF
SDLC380-38F8237 #2 (AT)0C0-0DF
SDLC3A0-3AF80287 NUMERIC CO-P (AT)0F0-0FF
MDA3B0-3BBHARD DISK (AT)1F0-1FF
PARALLEL PRINTER3BC-3BFGAME CONTROL200-20F
EGA3C0-3CFEXPANSION UNIT (XT)210-21F
CGA3D0-3DFBUS MOUSE238-23B
SERIAL PORT3E8-3EFALT BUS MOUSE23C-23F
FLOPPY DISK3F0-3F7PARALLEL PRINTER270-27F
SERIAL PORT3F8-3FFEGA2B0-2BF

3

3.2 ANALOG OUTPUT RANGE JUMPERS

The analog output voltage range of each channel is set with a jumper. The jumpers
are located on the board directly below the calibration potentiometers and are labeled
J1 through J8 on the DAC08 and. J1 through J16 on the DAC16.

Set the jumpers for an individual channel as shown in Figure 3-2.

Figure 3-2. Range Jumpers

The available ranges are:

0 to 5V (Unipolar)
0 to 10V (Unipolar)
±5V (Bipolar)
±10V (Bipolar)

3.3 UNIPOLAR/BIPOLAR INITIAL ZERO STATE JUMPER

The CIO-DAC16/16 and DAC08/16 boards have a unipolar/bipolar jumper which
selects the unipolar/bipolar initial zero state of the DAC output on either power-up or
reset. There is a single jumper for the entire board (Figure 3-3). This jumper is
located near the ISA bus connector.

At power-up, the value in the DACs will be set according to Table 3-2.

Table 3-2. DAC Initial States at Power-up

If DAC set for

Bipolar Output

Minus Full Scale0.0000UNI

0.000Mid Scale32768BIP

Jumper

DAC CodeState of UNI/BIP

IF DAC set for

Unipolar Output

4

This jumper affects ONLY the power-up / reset condition of the DACs. It is here to
insure that when the computer is turned on, or, if the computer is reset, process
controls will come up in a known, safe state.

Figure 3-3. Initial State Range Select Jumper Positions

If your application requires that the output of all DACs maintain a zero state initially,
you should use simultaneous update mode. This mode allows you to set the value
stored in the output registers before the output voltage is updated. If individual update
mode is used, the value of all DAC outputs will be updated to whatever value is stored
in the output registers at the moment that the first DAC is updated. This value is
undefined but typically will be + full scale (register value = FFFFh).

Using the simultaneous mode allows you to set the values of all registers before any of
the DACs are updated to the register value.

3.4 SIMULTANEOUS UPDATE JUMPER

This jumper selects either individual DAC update when the MSB register is written
(UPDATE) or simultaneous transfer of data to all DAC outputs on a read (XFER). In
simultaneous transfer mode, new output data is loaded into the DAC registers, but the
DAC outputs do not change until one of the registers have been read. The
simultaneous update occurs whenever any of the CIO-DAC16/16 addresses BASE + 0
through BASE + 31 (or addresses BASE + 0 through BASE + 15 for the DAC08) are
read (Figure 3-4).

Figure 3-4. Simultaneous Update Jumper

5

Note: Use simultaneous update to maintain power-up state (see
section on “Initial Zero State Jumper”).

In this way, the CIO-DAC16/16 and DAC08/16 may be set to hold new values until
all channels are loaded, then update all sixteen simultaneously. This can be a very
useful feature for multi-axis motor control.

3.5 INSTALLING THE BOARDS 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.

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 your board.

3.6 CABLING TO THE BOARD

The CIO-DAC16/16 and the DAC08/16 connectors are accessible through the PC/AT
expansion bracket. The connector is a standard 37-pin, D-type male connector. A
mating female connector, such as the C37FF-2, is available from Measurement
Computing.

Several cabling and screw termination options are available.

Table 3-3. Cable Termination Options

DFCON-37

C37FF-2

C37FFS-5

CIO-TERMINAL

D connector, D shell and termination pins to construct your
own cable.

Two-foot (and longer) ribbon cable with 37-pin D
connectors.
Five-foot shielded round cable with molded ends housing
37-pin connectors. Also available in 10-ft. length.
Simple, 40-position, 4" x 4" screw terminal board.CIO-MINI37

Full featured 4" x 16" screw terminal board with prototyping
and interface circuitry.

6

3.7 SIGNAL CONNECTION

The analog outputs of the CIO-DAC16/16 and the DAC08/16 are two-wire hook-ups;
a signal, labeled D/A # OUT on the connector diagram after this section, and a Low
Level Ground (LLGND). The low level ground is an analog ground and is the ground
reference which should be used for all analog hook-ups.

Possible analog output ranges are:

Bipolar Ranges ±10V ±5V
and
Unipolar Ranges 0 to 10V 0 to 5V

Each of the DAC outputs are individually buffered through an OP-27 operational
amplifier (OP-AMP). The OP-27s are socketted so that if one goes bad it can be
replaced in the field. The OP-27 for each channel is located just below the calibration
potentiometers for that channel.

Each channel is capable of sinking or sourcing ±5 mA. That means a load of 2K
Ohms can be connected to each channel at the full rated output swing of +10V.

As the load resistance is raised from 2K up to 10 MegΩ or more, the output load on
the DAC decreases. Any resistance greater than 2K is acceptable.

As the load resistance decreases, the output load increases. The OP-27 responds by
producing a lower output voltage. If your DAC board will not produce the output
voltage specified by the code & range combination, check the load with an ohmmeter.

Under normal circumstances you will not damage the OP-27 by connecting the output
to ground. If your connection results in a failure of the OP-27, chances are good that
there was some potential at the connecting point in addition to a load at ground or
between 0 and 2K ohms. Explore the point with a DVM before reconnecting the
CIO-DAC16/16 or DAC08/16 (and after replacing the OP-27 of course). Connect the
negative lead of the DVM to any LLGND pin of the CIO-DAC16/16 or DAC08/16.

7

3.8 CONNECTOR DIAGRAM

Both the CIO-DAC16/16 and DAC08/16 are 37 pin D type connectors accessible
from the rear of the PC through the expansion backplate.

The connector accepts female 37-pin, D-type connectors, such as those on the
C37FF-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-TERMINAL, CIO-SPADE50 and CIO-MINI37
screw terminal boards in the Measurement Computing catalog.

8

4.0 REGISTER ARCHITECTURE

The CIO-DAC16/16 and DAC08/16 are simple boards to understand right down to
their lowest level. All control and data is read/written with simple I/O read and write
signals. No interrupt or DMA control software is required. Thus, the board's
functions are easy to control directly from BASIC, C or PASCAL.

4.1 CONTROL & DATA REGISTERS

The CIO-DAC16/16 has 32 analog output registers, the CIO-DAC08/16 has 16.
There are two for each channel, one for the lower eight bits and one for the upper
eight bits.

The first address, or BASE ADDRESS, is determined by setting a bank of switches on
the board.

A register is easy to read and write to. The register descriptions all follow the format:

01234567

A0A1A2A3A4A5A6A7

Where the numbers along the top row are the bit positions within the 8-bit byte and
the numbers and symbols in the bottom row are the functions associated with that bit.

To write to or read from a register in decimal or HEX, the bit weights in Table 4-1
apply:

Table 4-1. Bit Weights

HEX VALUEDECIMAL VALUEBIT POSITION

110
221
442

883
10164
20325
40646
801287

To write a control word or data to a register, the individual bits must be set to 0 or 1
then combined to form a Byte. Data read from registers must be analyzed to
determine which bits are on or off.
The method of programming required to set/read bits from bytes is beyond the scope
of this manual. Refer to a basic book on programming.

9

In summary form, the registers and functions are listed in Table 4-2. Each register has
eight bits which may constitute a byte of data or eight individual bit functions.

Table 4-2. Register Summary

READ FUNCTIONWRITE FUNCTIONADDRESS

Initiate simultaneous update.D/A 0 Least Significant ByteBASE + 0
Initiate simultaneous update.D/A 0 Most Significant ByteBASE + 1
Initiate simultaneous update.D/A 1 Least Significant ByteBASE + 2
Initiate simultaneous update.D/A 1 Most Significant ByteBASE + 3
Initiate simultaneous update.D/A 2 Least Significant ByteBASE + 4
Initiate simultaneous update.D/A 2 Most Significant ByteBASE + 5
Initiate simultaneous update.D/A 3 Least Significant ByteBASE + 6
Initiate simultaneous update.D/A 3 Most Significant ByteBASE + 7
Initiate simultaneous update.D/A 4 Least Significant ByteBASE + 8
Initiate simultaneous update.D/A 4 Most Significant ByteBASE + 9
Initiate simultaneous update.D/A 5 Least Significant ByteBASE + 10
Initiate simultaneous update.D/A 5 Most Significant ByteBASE + 11
Same.And so on for each DACBASE + #

The DAC16 contains 32 registers (16 register pairs). The DAC08 contains 16
registers. Each register pair controls 1 D/A output.

Each DAC has two 8-bit registers which are used to control it. The first register
contains the least significant eight bits of D/A code and should be written first.

01234567

LSBD14D13D12D11D10D9D8

The second register contains the most significant eight bits of D/A code and should be
written to last. A write to this register will update the output of the D/A with all 16
bits of the D/A code contained in the two registers. If the simultaneous update jumper
is set for XFER, no update will occur until a read of any one of the DAC registers is
executed. Upon a read, all DACs will update together.

01234567

D7D6D5D4D3D2D1MSB

4.2 OUTPUT TRANSFER FUNCTIONS

To program a DAC, you must select the output you desire in volts, then apply a
transfer function to that value. The transfer function for code = output is:

The UNIPOLAR transfer function of the DAC is:

10

FSV / 65,536 * CODE = OutV or CODE = OutV / FSV * 65,536

For Example:

If the range is 0 to 5V CODE = 2/5 * 65,536
and you desire a 2V output. CODE = 26,214

The BIPOLAR transfer function for the DAC is:
FSV/65,536 * CODE − 0.5 * FSV or CODE = (OutV + 0.5 * FSV) / FSV * 65,536

For example:

If the range is set to ±10 CODE = (−7V + 0.5 * 20) / 20 * 65,536
and you desire a −7V output. CODE = 9,830

11

5.0 SPECIFICATIONS

Power Consumption

+5V supply

CIO-DAC16/16 1.8A typical, 2.25 max
CIO-DAC08/16 1.3A typical, 1.7A max

Analog Output

Resolution 16 bits
Number of channels

CIO-DAC16/16 16 Voltage Output

CIO-DAC08/16 8 Voltage Output
D/A type AD660BN
Voltage Ranges ±5V, ±10V, 0 to 5V, 0 to 10V, jumper

selectable
Offset error Adjustable to zero
Gain error Adjustable to zero
Differential nonlinearity ±1LSB max
Integral nonlinearity ±1LSB max
Monotonicity Guaranteed monotonic to 15 bits over

temperature
Gain drift (DAC) ±15 ppm/°C max
Bipolar offset drift (DAC) ±5 ppm/°C max
Unipolar offset drift (DAC) ±3 ppm/°C max
Throughput System dependant
Slew Rate 2.8 V/µS Typical
Settling time (20V step to .0008%) 12µs typ, 19us max
Settling time (10V step to .0008%) 6µs typ, 9us max
Current Drive ±5 mA min
Output resistance (OP-27) 0.1 ohm max
Output short-circuit duration 40 mA min Continuous

Miscellaneous Double buffered output latches

Update DACs individually or all DACs

simultaneously (jumper selectable)

Power up and reset, all DAC's cleared to 0

volts (jumper selects bipolar or unipolar

zero)

Environmental

Operating temerature range 0 to 70°C
Storage temerature range -40 to 100°C
Humidity 0 to 90% non-condensing

12

For your notes.

13

For your notes.

14

EC Declaration of Conformity

We, Measurement Computing Corp., declare under sole responsibility that the
product:

CIO-DAC16/16
CIO-DAC08/16

to which this declaration relates, meets the essential requirements, is in conformity
with, and CE marking has been applied according to the relevant EC Directives listed
below using the relevant section of the following EC standards and other normative
documents:

EU EMC Directive 89/336/EEC: Essential requirements relating to electromagnetic
compatibility.

EU 55022 Class B: Limits and methods of measurements of radio interference
characteristics of information technology equipment.

EN 50082-1: EC generic immunity requirements.

IEC 801-2: Electrostatic discharge requirements for industrial process measurement

and control equipment.

IEC 801-3: Radiated electromagnetic field requirements for industrial process
measurements and control equipment.

IEC 801-4: Electrically fast transients for industrial process measurement and control
equipment.

16 Channel analog output board
8 Channel analog output board

DescriptionPart Number

Carl Haapaoja, Director of Quality Assurance

Measurement Computing Corporation

16 Commerce Boulevard,

Middleboro, MA 02346

[phone]

Fax: [phone]

E-mail: [e-mail]

www. measurementcomputing.com