PCL-728
2-ch Isolated Analog Output ISA
Card
User Manual
Copyright
The documentation and the software included with this product are copyrighted 2011 by Advantech Co., Ltd. All rights are reserved. Advantech
Co., Ltd. reserves the right to make improvements in the products
described in this manual at any time without notice. No part of this manual may be reproduced, copied, translated or transmitted in any form or
by any means without the prior written permission of Advantech Co., Ltd.
Information provided in this manual is intended to be accurate and reliable. However, Advantech Co., Ltd. assumes no responsibility for its use,
nor for any infringements of the rights of third parties, which may result
from its use.
Acknowledgements
PC-LabCard is a trademark of Advantech Co., Ltd.
IBM, PC are trademarks of International Business Machines Corporation.
MS-DOS, Windows, Microsoft Visual C++ and Visual BASIC are
trademarks of Microsoft Corporation.
Intel and Pentium are trademarks of Intel Corporation.
Delphi and C++ Builder are trademarks of Borland Corporation.
Part No. 2003728000 1st Edition
Printed in Taiwan November 2011
PCL-728 User Manual ii
Product Warranty (2 years)
Advantech warrants to you, the original purchaser, that each of its products will be free from defects in materials and workmanship for two years
from the date of purchase.
This warranty does not apply to any products which have been repaired or
altered by persons other than repair personnel authorized by Advantech,
or which have been subject to misuse, abuse, accident or improper installation. Advantech assumes no liability under the terms of this warranty as
a consequence of such events.
Because of Advantech’s high quality-control standards and rigorous testing, most of our customers never need to use our repair service. If an
Advantech product is defective, it will be repaired or replaced at no
charge during the warranty period. For out-of-warranty repairs, you will
be billed according to the cost of replacement materials, service time and
freight. Please consult your dealer for more details.
If you think you have a defective product, follow these steps:
1. Collect all the information about the problem encountered. (For
example, CPU speed, Advantech products used, other hardware
and software used, etc.) Note anything abnormal and list any
onscreen messages you get when the problem occurs.
2. Call your dealer and describe the problem. Please have your manual, product, and any helpful information readily available.
3. If your product is diagnosed as defective, obtain an RMA (return
merchandize authorization) number from your dealer. This allows
us to process your return more quickly.
4. Carefully pack the defective product, a fully-completed Repair and
Replacement Order Card and a photocopy proof of purchase date
(such as your sales receipt) in a shippable container. A product
returned without proof of the purchase date is not eligible for warranty service.
5. Write the RMA number visibly on the outside of the package and
ship it prepaid to your dealer.
iii
Declaration of Conformity
CE
This product has passed the CE test for environmental specifications
when shielded cables are used for external wiring. We recommend the use
of shielded cables. This kind of cable is available from Advantech. Please
contact your local supplier for ordering information.
FCC Class A
Note: This equipment has been tested and found to comply with the limits
for a Class A digital device, pursuant to part 15 of the FCC Rules. These
limits are designed to provide reasonable protection against harmful
interference when the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency
energy and, if not installed and used in accordance with the instruction
manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference
at his own expense.
Technical Support and Assistance
Step 1. Visit the Advantech web site at www.advantech.com/support
where you can find the latest information about the product.
Step 2. Contact your distributor, sales representative, or Advantech's cus-
tomer service center for technical support if you need additional
assistance. Please have the following information ready before
you call:
- Product name and serial number
- Description of your peripheral attachments
- Description of your software (operating system, version, application software, etc.)
- A complete description of the problem
- The exact wording of any error messages
PCL-728 User Manual iv
Safety Instructions
1. Read these safety instructions carefully.
2. Keep this User's Manual for later reference.
3. Disconnect this equipment from any AC outlet before cleaning.
Use a damp cloth. Do not use liquid detergents for cleaning.
4. For plug-in equipment, the power outlet socket must be located
near the equipment and must be easily accessible.
5. Keep this equipment away from humidity.
6. Put this equipment on a reliable surface during installation. Dropping it or letting it fall may cause damage.
7. The openings on the enclosure are for air convection. Protect the
equipment from overheating. DO NOT COVER THE OPENINGS.
8. Make sure the voltage of the power source is correct before connecting the equipment to the power outlet.
9. Position the power cord so that people cannot step on it. Do not
place anything over the power cord.
10. All cautions and warnings on the equipment should be noted.
11. If the equipment is not used for a long time, disconnect it from the
power source to avoid damage by transient overvoltage.
12. Never pour any liquid into an opening. This may cause fire or electrical shock.
13. Never open the equipment. For safety reasons, the equipment
should be opened only by qualified service personnel.
14. If one of the following situations arises, get the equipment checked
by service personnel:
a. The power cord or plug is damaged.
b. Liquid has penetrated into the equipment.
c. The equipment has been exposed to moisture.
d. The equipment does not work well, or you cannot get it to work
according to the user's manual.
e. The equipment has been dropped and damaged.
f. The equipment has obvious signs of breakage.
15. DO NOT LEAVE THIS EQUIPMENT IN AN ENVIRONMENT
WHERE THE STORAGE TEMPERATURE MAY GO BELOW 20° C (-4° F) OR ABOVE 60° C (140° F). THIS COULD DAM-
v
AGE THE EQUIPMENT. THE EQUIPMENT SHOULD BE IN A
CONTROLLED ENVIRONMENT.
16. CAUTION: DANGER OF EXPLOSION IF BATTERY IS
INCORRECTLY REPLACED. REPLACE ONLY WITH THE
SAME OR EQUIVALENT TYPE RECOMMENDED BY THE
MANUFACTURER, DISCARD USED BATTERIES ACCORDING TO THE MANUFACTURER'S INSTRUCTIONS.
The sound pressure level at the operator's position according to IEC 7041:1982 is no more than 70 dB (A).
DISCLAIMER: This set of instructions is given according to IEC 704-1.
Advantech disclaims all responsibility for the accuracy of any statements
contained herein.
Safety Precaution - Static Electricity
Follow these simple precautions to protect yourself from harm and the
products from damage.
1. To avoid electrical shock, always disconnect the power from your
PC chassis before you work on it. Don't touch any components on
the CPU card or other cards while the PC is on.
2. Disconnect power before making any configuration changes. The
sudden rush of power as you connect a jumper or install a card may
damage sensitive electronic components.
PCL-728 User Manual vi
Contents
Chapter 1 Introduction .................................................... 2
1.1 Features ............................................................................. 2
1.2 Specifications .................................................................... 2
1.2.1 Analog Output ................................................................ 2
1.2.2 General Specifications ................................................... 3
1.3 Applications ...................................................................... 3
1.4 Installation Guide .............................................................. 4
1.5 Software Overview............................................................ 5
Chapter 2 Installation ....................................................... 8
2.1 Unpacking ......................................................................... 8
2.2 Driver Installation ............................................................. 9
2.3 Hardware Installation ...................................................... 10
Chapter 3 Signal Connections ........................................ 14
3.1 Overview ......................................................................... 14
3.2 Switch & Jumper Settings .............................................. 14
3.3 Signal Connections.......................................................... 19
Appendix A Register Format ............................................ 24
Appendix B Block Diagram............................................... 30
Appendix C PC I/O Port Address Map ............................ 32
Appendix D Calibration ..................................................... 34
D.1 VR Assignment ............................................................... 34
Figure 1.1:Installation Flow Chart ................................. 4
Figure 2.1: Advantech Automation Software Setup ...... 9
Figure 2.2:Different Options for Driver Setup ............ 10
Figure 3.1:Card Connectors, Jumpers & Switches ...... 14
3.2.1 Base Address Selection ................................................ 15
Table 3.1:Switch Position Summary ........................... 15
3.2.2 Reference Source Selection ......................................... 16
3.2.3 Voltage Output Selection ............................................. 17
Table 3.2:Summary of Jumper Settings ....................... 17
3.2.4 Current Sink Range Selection ...................................... 18
Figure 3.2:Connectors CN1 and CN2 .......................... 19
Table A.1:Unipolar Binary Code Table ....................... 26
Table A.2:Bipolar Binary Code Table ......................... 27
vii Table of Contents
PCL-728 User Manual viii
2
1
CHAPTER
Introduction
This chapter contains information on the
PCL-728 and instruction on card configuration in order to match your application and prepare it for installation on
your system.
Sections include:
• Features
• Specifications
• Applications
• Installation Guide
• Software Overview
Chapter 1 Introduction
The PCL-728 provides 2 isolated analog output channels on a single PCBUS add-on card. Each channel is fully isolated, and independent from
the system's ground, and can be set to the following ranges: 0 to 5V, 0 to
10V, +/-5V, +/-10V, 4 to 20mA, and 0 to 20mA current output.
Designed for rugged environment, the PCL-728 is an ideal and economical solution for industrial application requiring multiple analog voltage
and/or current output channels.
1.1 Features
• 2 Independent analog output channels
• 12-bit resolution double-buffered D/A converter
• Multiple voltage ranges: ±10 V, ±5 V, 0 ~ +5 V, 0 ~ +10 V, 4 ~ 20 mA
and 0 ~ 20 mA current loop (sink)
• Two DB9 connectors for easy wiring
1.2 Specifications
1.2.1 Analog Output
Channels: 2 channels
Resolution: 12 Bits. Double buffered
Output range: 0 to +5V (unipolar)
0 to +10V (unipolar)
+/- 5V (bipolar)
+/- 10V (bipolar)
0 to 20mA current loop (sink)
4 to 20mA current loop (sink)
Reference voltage:
Internal: -5V (+/- 0.05V)
-10v (+/- 0.05V)
External: DC or AC, +/- 10V max.
Conversion type: 12 bit monolithic multiplying
Isolation voltage: 2500V
DC
PCL-728 User Manual 2
Analog devices: AD7541AKN or equivalent
Linearity: +/- 1/2 bit
Accuracy: +/- 0.012% full scale range
Temperature draft: 5PPM/deg C full scale range
Settling time: 60 us max. with AD8677 output amplifiers
Current loop: 4 to 20 mA and 0 to 20mA constant current sink
Voltage output drive: +/- 5mA max.
Current loop excitation voltage: Minimum +8V, maximum 36V for 4
to 20mA and 0 to 20mA current loop
Reset (power-on status): All D/A channels will be at 0 volt output
after reset or power-on, either bipolar or unipolar mode
1.2.2 General Specifications
Power consumption: 5V @ 800 mA max.
I/O connector: 2 x DB9 female connector
Operating Temp.: 0 to +50°C (0 to +122°F)
Storage Temp.: -20 to +65°C (-4 to +149°F)
Weight: 120 gms
1.3 Applications
• Process control
• Programmable voltage source
• Programmable current sink
• Servo control
• Multiple loop PID control
3 Chapter 1
1.4 Installation Guide
Before you install your PCL-728 card, please make sure you have the following necessary components:
• PCL-728 DA&C card
• PCL-728 User Manual
• Driver software Advantech DLL drivers (in the companion CD-ROM)
• PC or workstation with a ISA-bus slot
Some other optional components are also available for enhanced operation: ActiveDAQ, ActiveDAQ Pro, LabView or other 3rd-party software
packages.
After you get the necessary components and maybe some of the accessories for enhanced operation of your multifunction card, you can then
begin the installation procedure. Figure 1.1 gives users an overview of the
software and hardware installation procedure:
Figure 1.1: Installation Flow Chart
PCL-728 User Manual 4
1.5 Software Overview
Advantech offers a rich set of DLL drivers, third-party driver support and
application software to help fully exploit the functions of your
PCL-728 card:
• Device Drivers (on the companion CD-ROM)
• LabVIEW driver
• Advantech ActiveDAQ Pro
Programming Choices for DA&C Cards
You may use Advantech application software such as Advantech Device
Drivers. On the other hand, advanced users can use register-level programming, although this is not recommended due to its laborious and
time-consuming nature.
Device Drivers
Advantech Device Driver software is included on the companion
CD-ROM at no extra charge. It also comes with all Advantech DA&C
cards. Advantech’s Device Drivers features a complete I/O function
library to help boost your application performance. Advantech Device
Drivers for Win 2000/XP works seamlessly with development tools such
as Visual C++, Visual Basic, Borland C++ Builder and Borland Delphi.
Register-level Programming
Register-level programming is available for experienced programmers
who find it necessary to write code directly at the level of the device register. But since register-level programming requires much effort and time,
it is strongly recommend to use the Advantech Device Drivers instead.
5 Chapter 1
PCL-728 User Manual 6
2
2
CHAPTER
Installation
This chapter contains a package item
checklist, proper instructions for
unpacking and step-by-step procedures
for card installation.
Sections include:
• Unpacking
• Driver Installation
• Hardware Installation
• Device Configuration
Chapter 2 Installation
2.1 Unpacking
After receiving your PCL-728 package, please inspect its contents first.
The package should contain the following items:
• PCL-728 card
• Companion CD-ROM (Device Drivers included)
• User Manual
The PCL-728 cards harbor certain electronic components vulnerable to
electrostatic discharge (ESD). ESD can easily damage the integrated circuits and certain components if preventive measures are ignored.
Before removing the card from the antistatic plastic bag, you should take
the following precautions to ward off possible ESD damage:
Touch the metal part of your computer chassis with your hand to discharge the static electricity accumulated on your body. Alternatively, one
can also use a grounding strap.
Touch the anti-static bag to a metal part of your computer chassis before
opening the bag.
Take hold of the card only by the metal bracket when removing it out of
the bag.
After taking out the card, you should first:
Inspect the card for any possible signs of external damage (loose or damaged components, etc.). If the card is visibly damaged, please notify our
service department or our local sales representative immediately. Do not
install a damaged card into your system.
Also, pay extra caution to the following aspects during installation:
• Avoid physical contact with materials that could hold static electricity
such as plastic, vinyl and Styrofoam.
• Whenever you handle the card, grasp it only by its edges. DO NOT
TOUCH the exposed metal pins of the connector or the electronic components.
PCL-728 User Manual 8
Note: Keep the anti-static bag for future use. You might need the
original bag to store the card I you have to remove the card
from a PC or transport it elsewhere.
2.2 Driver Installation
We recommend you install the driver before you plug the PCL-728 into
your system, since this will guarantee a smooth installation process.
The Advantech Device Drivers Setup program for the PCL-728 card is
included in the companion CD-ROM that is shipped with your DA&C
card package. Please follow the steps below to install the driver software:
1. Insert the companion CD-ROM into your CD-ROM drive.
2. The Setup program will be launched automatically if you have the
autoplay function enabled on your system. When the Setup Program is
launched, the Setup Screen will appear.
Note: If the autoplay function is not enabled on your computer,
use Windows Explorer or Windows Run command to execute AUTORUN.EXE on the companion CD-ROM.
Figure 2.1: Advantech Automation Software Setup
9 Chapter 2
3. First, install the Advantech Device Manager.
4. Select the "Individual Drivers" to install the specific device driver
then just follow the installation instructions step by step to complete
your device driver installation and setup.
Figure 2.2: Different Options for Driver Setup
For further information on driver-related issues, an online version of the
Device Drivers Manual is available by accessing the following path:
Start/Advantech Automation/Device Manager/Device Driver’s Manual
2.3 Hardware Installation
Note: Make sure you have installed the driver and
Advantech Device Manager before you install the
card (please refer to chapter 2.2 Driver Installation)
After the Device Drivers installation is completed you can install the
PCL-728 card into any ISA slot on your computer. A complete device
installation procedure should include device setup, configuration and testing. The following sections will guide you through the Setup, Configuration and Testing of your device. However, it is suggested that you refer to
the computer’s user manual or related documentation if you have any
doubts. Please follow the steps below to install the card.
PCL-728 User Manual 10
1. Turn off your computer and unplug the power cord and cables.
2. Remove the cover of your computer.
3. Remove the slot cover on the back panel of your computer.
4. Touch the metal part on the surface of your computer to neutralize the
static electricity that might be on your body.
5. Insert the PCL-728 card into a ISA slot. Hold the card only by its edges
and carefully align it with the slot. Insert the card firmly into place.
6. Fasten the bracket of the ISA card on the back panel rail of the com-
puter with screws.
7. Connect appropriate accessories (DB 9-pin cable wiring terminals, etc.
if necessary) to the ISA card.
8. Replace the cover of your computer chassis. Re-connect the cables you
removed in step 2.
9. Plug in the power cord and turn on the computer.
After your card is properly installed on your system, you can now configure your device using the Advantech Device Manager Program that has
itself already been installed on your system during driver setup.
11 Chapter 2
PCL-728 User Manual 12
2
3
CHAPTER
Signal Connections
This chapter provides useful information about how to connect input and
output signals to the PCL-728 via the
I/O connector.
Sections include:
• Overview
• Switch & Jumper Settings
• Signal Connections
Chapter 3 Signal Connections
3.1 Overview
Maintaining signal connections is one of the most important factors in
ensuring that your application system is sending and receiving data correctly. A good signal connection can avoid unnecessary and costly damage to your PC and other hardware devices. This chapter provides useful
information on how to connect input and output signals to the PCL-728
via the I/O connector.
3.2 Switch & Jumper Settings
The PCL-728 uses ten sets of jumper pins (five sets for each channel) to
configure its reference source, voltage output, and current sink range
selections to your applications requirements. It also uses an 8-position
DIP switch for selecting an appropriate I/O address for its firmware to
occupy. Below figure shows the positions of connectors, jumpers and
switches.
Figure 3.1: Card Connectors, Jumpers & Switches
Location Description
CN1 DB 9-pin connector for analog output channel 1
CN2 DB 9-pin connector for analog output channel 2
JP3, JP4, JP7, JP8 Reference Source Selection
JP1, JP2, JP5, JP9 Voltage Output Selection
JP6, JP10 Current Sink Range Selection
SW1 Base Address setting
PCL-728 User Manual 14
3.2.1 Base Address Selection
Switch name: SW1 position 1 to 8
Most PC peripheral devices and interface cards are controlled
through the input/output (I/O) ports. These ports are
addressed using the I/O 5 port address space. Appendix C
provides a PC I/O port address map to help you locate appropriate addresses for different devices.
The I/O port base address for the PCL-728 is selectable via
an 8 position DIP switch. Valid addresses are from hex 200
to hex 3F0, however you might have used some of these
addresses for other devices. Your PCL-728 base address
switch setting is set to hex 2C0 in the factory. If you need to
adjust it to some other address range, the switch settings for
various base addresses are illustrated as below:
Table 3.1: Switch Position Summary
I/O Address
Range (Hex)
200-207 OFFONONONONONONX
210-21F OFFONONONONOFFONX
.
.
2C0-2CF* OFF ON OFF OFF ON ON ON X
300-30F OFF OFF ON ON ON ON ON X
12345678
A9 A8 A7 A6 A5 A4 A3 X
Switch Position
Note:
- X = Non specific
- A3...A9 corresponds to PC bus address lines
- * means factory setting
15 Chapter 3
3.2.2 Reference Source Selection
Jumper name: JP3, JP4, JP7, JP8
Before setting the PCL-728's reference source, you must
decide which type of source, internal or external (JP4 for
channel 1, and JP8 for channel 2), you want to use with your
application. External reference voltage may be selected for
AC or DC sources. The maximum external reference voltage
is +/- 10V, and the maximum D/A output range is +/- 10V.
See the illustration below:
JP4 & JP8 JP4 & JP8
Internal* External
Note:
* denotes factory setting
A fixed, precision internal -5 and -10V reference is provides
by the PCL-728. Setting channel 1 and 2's internal reference
source is accomplished by closing JP3 (for channel 1), and
JP7 (for channel 2). The internal reference source can be set
to -10V or -5V. The following illustration pertains to both of
these jumpers.
JP3 & JP7 JP3 & JP7
Internal -5V* External -10V
PCL-728 User Manual 16
3.2.3 Voltage Output Selection
Jumper name: JP1, JP2, JP5, JP9
Jumpers, JP1 and JP5 (for channel 1), and JP2 and JP9 (for channel 2),
are all used to select each channel's voltage output as either unipolar or
bipolar. The following illustration shows the voltage output selection for
both channels.
UNIPOLAR OUTPUT*
JP1 & JP2 JP5 & JP9
BIPOLAR OUTPUT
JP1 & JP2 JP5 & JP9
Note:
* denotes factory setting
Some typical reference source and output range configurations are illustrated below:
Table 3.2: Summary of Jumper Settings
Output Range JP3 (JP7) JP1 & JP5 (JP2 & JP9)
0 to +5V
Unipolar
0 to 10V
Unipolar
+/-5V
Bipolar
+/-10V
Bipolar
17 Chapter 3
3.2.4 Current Sink Range Selection
Jumper name: JP6, JP10
JP6 and JP10 are used to select each channels' current sink range of either
4 - 20mA or 0 -20mA. JP6 corresponds with channel 1, and JP10 is used
with channel 2. In order to use the current sink range, you must set the
PCL-728's output voltage to unipolar. You must also use the internal reference source set to -5V. The diagram below shows the correct jumper
settings for the PCL-728's current sink range.
JP6 & JP10 JP6 & JP10
4-20mA* 0-20mA
Note:
Note:
* denotes factory setting
In order to maintain an accurate output during your application, it is important that you keep the PCL-728's variable resistors (VRs) be calibrated from time to time.
Calibration instructions are provided in Appendix.
PCL-728 User Manual 18
3.3 Signal Connections
The PCL-728 is equipped with two DB9 pin female connectors, located
on the card at CN1 and CN2. Use these connectors for outputting a D/A
signal to an external device. CN1 is used as an output connection for
channel 1, and CN2 is used for channel 2.
The following diagrams illustrate the pin assignment of each connector.
Legend:
V OUT: Analog voltage output
EXT. REF: External reference source voltage input
I. SINK: Current sink
A.GND: Analog ground
+15V: +15V outputt
Figure 3.2: Connectors CN1 and CN2
19 Chapter 3
Voltage Output Connections
Voltage Connections
The PCL-728 supports isolated channels of D/A voltage output. There is
only one output signal wire for each channel. The voltage is referred to
the common ground. It is fairly simple to connect a voltage output channel to a floating load.
A standard wiring diagram is illustrated below:
For grounded load, the signal should be connected as:
For some differential input loads, an external ground wire is needed and
the signal connection is recommended as following:
PCL-728 User Manual 20
4 to 20 mA and 0 to 20mA Current Sink Connections
The PCL-728 provides 2 channels of 4 to 20mA and 0 to 20mA current
output. The current loop output utilizes the 0 to 5V(unipolar) voltage output as the driving source and a current drive circuit consists of a power
FET, reverse protection diode and a constant current source. The voltage
bias of this current output should be within 8 to 36 volts to insure correct
operation. The card also provides an internal 15V power source for current loop sources which can be implemented via Pin 9, located on connectors CN1 and CN2. As shown below there are three ways of connecting:
grounded load with a floating supply, floating load with a grounded
power supply and floating load with internal 15 volt supply:
21 Chapter 3
Programmable Attenuator Connection
A variety of D/A operations can be supported by your PCL-728. For
example, the PCL-728 can function as a digital attenuator by inputting
variable AC or DC references, or can be used to generate arbitrary waveform outputs. If you want to use this function, please set jumpers, JP4 for
channel 1, and JP8 for channel 2, to the external setting. The attenuation
factor between the reference input and analog output is:
ATTENUATION FACTOR = G/4096
where G is the data written to the PCL-728's D/A registers, and the value
is between 0 and 4095. For example, if G represents 2048, then the attenuation factor will be 0.5. A sine wave amplitude of 10V applied to the
external reference input will generate a sine wave amplitude of 5V from
the card's output pin.
And illustration of an attenuator connection used in these applications is
shown below.
PCL-728 User Manual 22
2
A
APPENDIX
Register Format
Appendix A Register Format
Introduction
The following sections provide information about the PCL-728's register
structure and format. This consists of the card's I/O address map, and its
data format. You may use this information to write your own software
driver. Programming examples are provides for your convenience as well.
I/O Port Address Map
The PCL-728 uses four consecutive output (write-only) address, Base+0,
Base+1, Base+2, and Base+3, for your programming and application
requirements. The table below outlines each of these addresses according
to how they are used.
Address R/W Usage
BASE +0 W CH1 high byte data
BASE +1 W CH1 low byte data
BASE +2 W CH2 high byte data
BASE +3 W CH2 low byte data
Note:
When programming the PCL-728, the high byte data is
sent first. Once this has been done, it will be temporarily
held in the card's register, and the high data will be
combined to the low byte data, and then passed on to
the D/A converter. This double buffering process protects the PCL-728's D/A data integrity by using a single
step update.
BASE+0 High Byte Data
The following table pertains to channels 1's high byte data bits from base
address BASE+0.
D7 D6 D5 D4 D3 D2 D1 D0
XXXXDA11DA10DA9DA8
Legend:
X = Non-specific
DA11 to DA8 = Digital to analog data. DA11 is the Most Significant Bit
(MSB).
PCL-728 User Manual 24
BASE+1 Low Byte Data
The following table pertains to channels 1's low byte data bits from base
address BASE+1.
D7 D6 D5 D4 D3 D2 D1 D0
DA7 DA6 DA5 DA4 DA3 DA2 DA1 DA0
Legend:
X = Non-specific
DA7 to DA0 = Digital to analog data. DA0 is the Least Significant Bit
(LSB).
BASE+2 High Byte Data
The following table pertains to channel; 2's high byte data bits from base
address Base+2.
D7 D6 D5 D4 D3 D2 D1 D0
XXXXDA11DA10DA9DA8
Legend:
X = Non-specific
DA11 to DA8 = Digital to analog data. DA11 is the Most Significant Bit
(MSB).
25 Appendix A
BASE+3 Low Byte Data
The following table pertains to channels 2's low byte data bits from base
address BASE+3:
D7 D6 D5 D4 D3 D2 D1 D0
DA7 DA6 DA5 DA4 DA3 DA2 DA1 DA0
Legend:
X = Non-specific
DA7 to DA0 = Digital to analog data. DA0 is the Least Significant Bit
(LSB).
Unipolar and Bipolar Binary Code Tables
Table A.1: Unipolar Binary Code Table
Digital Input Code
MSB LSB Nominal Analog Output
1111 1111 1111 -V
1000 0000 0001 -V
1000 0000 0000 -V
0111 1111 1111 -V
0000 0000 0001 -V
0000 0000 0000 -V
* (4095/4096)
REF
* (2049/4096)
REF
* (2048/4096) =-V
REF
* (2047/4096)
REF
* (1/4096)
REF
* (0/4096) = 0
REF
REF
/2
Note:
1. V
is the reference source voltage that you selected.
REF
2. Normal full scale is given by FS = -V
3. Nominal LSB magnitude is given by LSB = -V
4096).
PCL-728 User Manual 26
*(4095/4096).
REF
REF
*(1/
Table A.2: Bipolar Binary Code Table
Digital Input Code
MSB LSB Nominal Analog Output
1111 1111 1111 - V
1000 0000 0001 -V
1000 0000 0000 0
0111 1111 1111 + V
0000 0000 0001 +V
0000 0000 0000 +V
* (2047/2048)
REF
* (1/2048)
REF
* (1/2048)
REF
* (2047/2048)
REF
* (2048/2048)
REF
Note:
1. V
is the reference source voltage that you
REF
selected.
2. Normal full scale is given by FS = -V
REF
*(2047/
2048).
3. Nominal LSB magnitude is given by LSB = -V
REF
*(1/
2048).
Programming Examples
The PCL-728's utility diskette has two files containing demonstration programs. The files are named DEMO728.C, and
TESTPROG.EXE. Use these file to run programs which
demonstrate various PCLO-728 functions and commands.
27 Appendix A
PCL-728 User Manual 28
2
B
APPENDIX
Block Diagram
Appendix B Block Diagram
PCL-728 User Manual 30
2
C
APPENDIX
PC I/O PORT
ADDRESS MAP
Appendix C PC I/O Port Address Map
I/O Address Range (Hex) Function
000-1FF Base system
200 Reserved
201 Came control
202-277 Reserved
278-27F Second printer port
280-2F7 Reserved
2F8-2FF COM2
300-377 Reserved
3713-37F First printer port
380-3AF Reserved
3B0-3BF Mono Disp/Print adapter
3C0-3CF Reserved
3D0-3DF Color/Graphics
3E0-3EF Reserved
3F0-3F7 Floppy disk drive
3F8-3FF COM1
PCL-728 User Manual 32
2
D
APPENDIX
Calibration
Appendix D Calibration
In the application of data acquisition and control, it is important to constantly calibrate your measurement device to maintain its accuracy. A calibration program, CALB728.BAS, is provided on the PCL-728 software
diskette to assist your calibration work.
D.1 VR Assignment
The PCL-728 uses 12 variable resistors (VR), six for each channel, which
allow you to calibrate each of its two output channels. The following
information outlines each VR as it relates to its function.
VR1: CH1's internal -10V reference source adjustment
VR2: CH1's internal -5V reference source adjustment
VR3: CH1's gain adjustment
VR4: CH1's unipolar offset adjustment
VR5: CH1's bipolar offset adjustment
VR6: CH1's current sink offset adjustment (4mA to 20mA)
VR7: CH2's internal -5V reference source adjustment
VR8: CH2's internal -10V reference source adjustment
VR9: CH2's gain adjustment
VR10: CH2's bipolar offset adjustment
VR11: CH2's unipolar offset adjustment
VR12: CH2's current sink offset adjustment (4mA to 20mA)
In order to calibrate the PCL-728, you should use a precision voltmeter to
obtain accurate readings. Standard procedures for performing a calibration are given below.
PCL-728 User Manual 34
Internal Reference Source Calibration
When calibrating the PCL-728's internal reference source, you ground
one of your voltmeter's probe, while the other probe is connected to TP1
(Test Point 1 for channel 1), or TP2 (Test Point 2 for channel 2).
A. Use VR2 and/or VR7 to adjust each channel's -5V reference source to
obtain a voltage of -5V.
B. VR1 and/or VR8 are used to calibrate each channels's -10V reference
source to obtain a voltage of -10V.
Unipolar Output Offset Calibration
A. Select an appropriate reference voltage source for each channels to be
calibrated.
B. Set all digital input codes to 0. Then adjust VR4 and/or VR11 (depending on what channels are to be calibrated) until your voltmeter reads 0
volts.
Unipolar Output Gain Calibration
A. Select an appropriate reference voltage source for the channels to be
calibrated.
B. Set all digital input codes to 1. Now, adjust VR3 and/or VR9 until your
voltmeter shows a reading equal to the output voltage.
4mA Constant Current Calibration
A. Set the digital output code to 000000000000, and set each channel's
reference voltage to -5V, and unipolar output.
B. Adjust VR6 and/or VR12 to maintain a constant current of 4mA.
Bipolar Output Offset Calibration
A. Select a reference voltage source for the channels you will calibrate.
B. Set the digital input code to 100000000000. Adjust VR5 and/or VR10
until your voltmeter reads 0 volts.
35 Appendix D
Bipolar Output Gain Calibration
A. Select a reference voltage source for the channels you will calibrate.
B. Set the digital input code to 0. Then adjust VR3 and/or VR9 until your
voltmeter shows a reading equal to the output voltage.
C. Now, set all digital input codes to 1. Adjust VR3 and/or VR9 until your
voltmeter shows a reading equal to the output voltage.
PCL-728 User Manual 36
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