Real Time Devices DM5854HR User manual

DM5854HR/DM6854HR
Isolated digital I/O-module
User's Manual
Real Time Devices Finland Oy
Real Time Devices Finland Oy
Lepolantie 14
FIN-00660 Helsinki, Finland
Tel: [phone]
Fax: [phone]
Email: [email protected]
URL: www.rtdfinland.fi
DM5854HR/DM6854HR (c) RTD Finland Oy 1996-2001

IMPORTANT
Although the information contained herein has been
carefully verified RTD Finland Oy assumes no
responsibility for any errors that may occur, for
any damage to property or persons resulting from
improper use of this manual or from the related
software. RTD Finland Oy also reserves the right to
alter the contents of this manual, as well as
features and specifications of this product at any
time, without prior notice.
Published by
Real Time Devices Finland Oy
Lepolantie 14
FIN-00660 Helsinki, Finland
Copyright © 1996-2001 by RTD Finland Oy
All rights reserved
Printed in Finland
DM5854HR/DM6854HR (c) RTD Finland Oy 1996-2001

Table of Contents
===============================================================
INTRODUCTION
General purpose digital I/O
Isolated digital inputs
Isolated digital outputs
Mechanical description
Connector description
What comes with your board
Board accessories
Application software and drivers
Hardware accessories
Using this manual
When you need help
CHAPTER 1 - BOARD SETTINGS
Factory-configured jumper settings
Base Address jumpers
Interrupts and interrupt channels
Pull-up or Pulldown jumpers
Isolated input range selection jumpers
CHAPTER 2 - BOARD INSTALLATION
Board installation
External I/O connections
Isolated Input/Output Connector
50-pin RTD Expansion Connector
CHAPTER 3 - HARDWARE DESCRIPTION
Digital I/O, 8255 Programmable digital I/O
Isolated optocoupler inputs
Isolated optocoupler outputs
Trigger output
Interrupts
DM5854HR/DM6854HR Page 1 (c) RTD Finland Oy 1996-2001

CHAPTER 4 - BOARD OPERATION AND PROGRAMMING
Defining the I/O map
Base+0 Read digital inputs / Clear interrupt
Base+1 Digital input mask
Base+2 Digital input inversion register
Base+3 Control register / Digital outputs
Base+4 PPI Port A (Read/Write)
Base+5 PPI Port B (Read/Write)
Base+6 PPI Port C (Read/Write low and high byte)
Base+7 PPI Port CW (Write)
Programming the DM6854HR
Clearing and setting bits in a port
Initializing the 8255 PPI
Isolated Digital Input programming
Isolated Digital Output programming
Trigger Output programming
Interrupts
What is an interrupt?
Interrupt request lines
8259 Programmable interrupt controller
Interrupt mask register (IMR)
End-Of-Interrupt (EOI) Command
What exactly happens when an interrupt occurs?
Using interrupts in your program
Writing an interrupt service routine (ISR)
Saving the startup IMR and interrupt vector
Common Interrupt mistakes
APPENDIX A - DM5854HR/6854HR Specifications
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List of Illustrations
===============================================================
DM5854HR/DM6854HR Page 3 (c) RTD Finland Oy 1996-2001

This user's manual describes the operation of the DM5854HR/DM6854HR Isolated
Digital Interface board.
Some of the key properties of the DM5854HR/DM685HR include:
* 8 channel-by-channel isolated digital inputs with masking modes
* 4 Optocoupled digital outputs with open collector configuration, 30V range
* 24 non isolated TTL/CMOS compatible 8255-based digital I/O lines
* Optional Pull-up or Pull-down resistors
* Software enabled interrupts XT and AT interrupts available
* Single +5V operation
* Support for direct PC/104 interface with RTD dataModules®
* XT (DM5854HR) and AT (DM6854HR) boards available
* PC/104 compliant
* RTD IDAN compatible
The following paragraphs briefly describe the major features of the DM6854HR. A more detailed
discussion is included in Chapter 3 (Hardware description) and in Chapter 4 (Board operation and
programming. The board setup is described in Chapter 1 (Board Settings).
General purpose digital I/O
The DM6854HR board has 24 8255-based TTL/CMOS compatible general purpose
digital I/O lines which can be directly interfaced with external devices or signals to interface to
alphanumerical displays, sense switch closures, trigger digital events, or activate solid-state relays.
These lines may be pulled down or pulled up or pulled down with 10K Ohm resistor networks.
Installation procedures will be described later in this manual.
Isolated digital inputs
8 Optocoupler inputs may be used to connect high voltage signals to a computer.
Eight channel-by-channel jumper configurable input ranges are available: +5V, +12V and
+24V. The optocoupler inputs have a reverse voltage protection diode across the input. This
enables AC-signals to be connected to the isolated optocoupler inputs. This input diode also
acts as a rectifier. The programmable functions of the DM6854HR enable input masking and
input pattern recognition with interrupts. This relieves the host computer from processor
capacity consuming input polling.
Isolated digital outputs
4 open collector optocoupler outputs may be used to directly drive loads such as
switches or relays with voltages up to 30V DC.
DM5854HR/DM6854HR Page 4 (c) RTD Finland Oy 1996-2001

Mechanical description
The DM6854HR is designed on a PC/104 form factor. An easy mechanical interface to
both PC/104 and EUROCARD systems can be achieved. Stack your PC/104 compatible
computer directly on the DM6854HR using the onboard mounting holes.
Connector description
There is a 50 pin digital interface connectors on the DM6854HR to directly interface to
the non-isolated 8255-based digital I/O signals. The signal definition of this connector is
compatible with the digital PC/104 dataModules manufactured by RTD.
Isolated outputs and inputs are connected to the DM6854HR by either a screw terminal
discrete wire connector of with a 50-pin flat ribbon cable header connector. Use this type of
interface connector with a TB50 screw terminal block. Please consult the factory for more
details on different connector options.
What comes with your board
You receive the following items in your DM6854HR package:
* DM5854HR or DM6854HR Isolated digital interface module
* User's manual
Note: Latest software and drivers can be downloaded from our website.
If any item is missing or damaged, please call Real Time Devices Finland Customer
service department at ([phone].
Board accessories
In addition to the items included in your DM6854HR delivery several software
and hardware accessories are available. Call your distributor for more information on these
accessories and for help in choosing the best items to support your control system.
* Application software and drivers
* Hardware accessories such as IDAN aluminium enclosure systems.
For more information in IDAn please visit our websites at
www.rtdfinland.fi and www.rtdusa.com.
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Real Time Devices can supply a complete set of accessories to your DM6854HR card.
These include enclosures, power supplies, terminal boards (TB50) and other interconnection
systems.
Using this manual
This manual is intended to help you install your new DM6854HR card and get it running
quickly, while also providing enough detail about the board and it's functions so
that you can enjoy maximum use of it's features even in the most demanding applications.
When you need help
This manual and all the example programs will provide you with enough information to
fully utilize all the features on this board. If you have any problems installing or using this board,
contact our Technical Support Department ([phone] during European business hours,
or send a FAX to ([phone] or Email to [email protected]. When sending a FAX or
Email request, please include your company's name and address, your name, your telephone
number, and a brief description of the problem.
DM5854HR/DM6854HR Page 6 (c) RTD Finland Oy 1996-2001

CHAPTER 1 - BOARD SETTINGS
===============================================================
The DM6854HR Isolated digital I/O board has jumper settings you can change to
suit your application and I/O configuration setup. The board is factory configured with a
+24V input range configuration. The factory settings are listed and shown in the diagram in
the beginning of this chapter.
DM5854HR/DM6854HR Page 7 (c) RTD Finland Oy 1996-2001

Factory-Configured Jumper Settings
Table 1-1 illustrates the factory jumper setting for the DM6864HR. Figure 1-1
shows the board layout and the locations of the jumpers. The following paragraphs explain
how to change the factory jumper settings to suit your specific application.
Table 1-1 - Factory jumper settings see figure 1-1 for detailed locations
JUMPER DESCRIPTION NUMBER OF FACTORY SETTING
NAME OF JUMPER JUMPERS JUMPERS INSTALLED
BASE BASE ADDRESS 5 300h INSTALLED
IRQ INTERRUPT CHANNEL 6 5
PU/PD PU/PD FOR PPI PORTS 3-Terminal PULLDOWN
IN1-8 INPUT RANGE FOR 3 +24V RANGE
ISOLATED INPUTS 1-8
Figure 1-1 - Board layout showing jumper locations
DM5854HR/DM6854HR Page 8 (c) RTD Finland Oy 1996-2001