Acces I/O products 104-IIRO-8 User manual

10623 Roselle Street, San Diego, CA 92121 y(858) 550-9559 yFax [phone]
[e-mail] ywww.accesio.com
ISOLATED DIGITAL
INPUT / RELAY OUTPUT
BOARD
MODEL 104-IIRO-8
104-IIRO-8E
USER MANUAL
File: M104-IIRO-8.A1h

Manual 104-IIRO-8(E)2
Notice
The information in this document is provided for reference only. ACCES does not assume any liability arising out
of the application or use of the information or products described herein. This document may contain or
reference information and products protected by copyrights or patents and does not convey any license under
the patent rights of ACCES, nor the rights of others.
IBM PC, PC/XT, and PC/AT are registered trademarks of the International Business Machines Corporation.
Printed in USA. Copyright 1998, 2005 by ACCES I/O Products, Inc. 10623 Roselle Street, San Diego, CA 92121.
All rights reserved.
WARNING!!
ALWAYS CONNECT AND DISCONNECT YOUR FIELD CABLING WITH THE
COMPUTER POWER OFF. ALWAYS TURN COMPUTER POWER OFF
BEFORE INSTALLING A BOARD. CONNECTING AND DISCONNECTING
CABLES, OR INSTALLING BOARDS INTO A SYSTEM WITH THE
COMPUTER OR FIELD POWER ON MAY CAUSE DAMAGE TO THE I/O
BOARD AND WILL VOID ALL WARRANTIES, IMPLIED OR EXPRESSED.

Manual 104-IIRO-8(E)3
Warranty
Prior to shipment, ACCES equipment is thoroughly inspected and tested to applicable specifications. However,
should equipment failure occur, ACCES assures its customers that prompt service and support will be available.
All equipment originally manufactured by ACCES which is found to be defective will be repaired or replaced
subject to the following considerations.
Terms and Conditions
If a unit is suspected of failure, contact ACCES' Customer Service department. Be prepared to give the unit
model number, serial number, and a description of the failure symptom(s). We may suggest some simple tests to
confirm the failure. We will assign a Return Material Authorization (RMA) number which must appear on the
outer label of the return package. All units/components should be properly packed for handling and returned with
freight prepaid to the ACCES designated Service Center, and will be returned to the customer's/user's site freight
prepaid and invoiced.
Coverage
First Three Years: Returned unit/part will be repaired and/or replaced at ACCES option with no charge for labor
or parts not excluded by warranty. Warranty commences with equipment shipment.
Following Years: Throughout your equipment's lifetime, ACCES stands ready to provide on-site or in-plant
service at reasonable rates similar to those of other manufacturers in the industry.
Equipment Not Manufactured by ACCES
Equipment provided but not manufactured by ACCES is warranted and will be repaired according to the terms
and conditions of the respective equipment manufacturer's warranty.
General
Under this Warranty, liability of ACCES is limited to replacing, repairing or issuing credit (at ACCES discretion)
for any products which are proved to be defective during the warranty period. In no case is ACCES liable for
consequential or special damage arriving from use or misuse of our product. The customer is responsible for all
charges caused by modifications or additions to ACCES equipment not approved in writing by ACCES or, if in
ACCES opinion the equipment has been subjected to abnormal use. "Abnormal use" for purposes of this
warranty is defined as any use to which the equipment is exposed other than that use specified or intended as
evidenced by purchase or sales representation. Other than the above, no other warranty, expressed or implied,
shall apply to any and all such equipment furnished or sold by ACCES.

Manual 104-IIRO-8(E)4
TABLE OF CONTENTS
Chapter 1: FUNCTIONAL DESCRIPTION............................................................................. 5
Figure 1-1: BLOCK DIAGRAM......................................................................................................................6
Chapter 2: INSTALLATION.................................................................................................... 7
Figure 2-1: PC/104 Key Information..............................................................................................................8
Chapter 3: OPTION SELECTION........................................................................................... 9
Figure 3-1: OPTION SELECTION MAP......................................................................................................10
Chapter 4: ADDRESS SELECTION..................................................................................... 11
Table 4-1: ADDRESS ASSIGNMENTS FOR COMPUTERS......................................................................11
Chapter 5: PROGRAMMING................................................................................................ 13
Chapter 6: CONNECTOR PIN ASSIGNMENTS................................................................... 15
Chapter 7: SPECIFICATIONS.............................................................................................. 16

Manual 104-IIRO-8(E)5
Chapter 1: FUNCTIONAL DESCRIPTION
This board provides isolated input, digital inputs and relay output interface for PC/104 compatible computers.
The board provides eight each optically-isolated inputs for AC or DC control signals, digital TTL compatible
inputs and electromechanical relay outputs. The board occupies four consecutive addresses in I/O space. Read
and write operations are done on an 8-bit-byte oriented basis. Two models are available, the basic model
includes Change of State Detection (COS) which will flag an interrupt, while the E model doesn’t include COS
detection or use interrupts.
INPUTS
The isolated inputs can be driven by either AC or DC signals and are not polarity sensitive. Input signals are
rectified by photocoupler diodes. A 1.8K-ohm resistor in series dissipates unused power. Standard 12/24 AC
control transformer outputs can be accepted as well as DC voltages. The input voltage range is 3 to 28 volts
(rms). External resistors connected in series may be used to extend the input voltage range.
Each input circuit contains a switchable slow/fast filter that has a 4.7 millisecond time constant. (Without filtering,
the response is 10 uSec.) The filter must be selected for AC inputs in order to eliminate response to zero
crossings. The filter is also valuable for use with slow DC input signals in a noisy environment. The filter may be
switched out for DC inputs in order to obtain faster response. Filters are individually selected by jumpers. The
filters are switched into the circuit when the jumpers are installed in position FLT0 to FLT7.
Eight digital inputs are available for digital applications. Inputs are TTL compatible and include 10K pullup
resistors.
INTERRUPTS
When enabled by a software read to base address +2 (and when a jumper is installed to select one of the
interrupt levels IRQ2-7, IRQ10-12, and IRQ14-15), the board asserts an interrupt whenever any of the inputs
changes state from low to high or high to low. This is called Change-of-State (COS) detection and greatly frees
up computer resources by eliminating the need for constant polling to determine when an input has changed.
Once an interrupt has been generated and serviced, it is cleared automatically after 2 usec.
This interrupt capability may be disabled by a software write to base address +2. It may be re-enabled with a
read to base address + 2. (Basic model only)
OUTPUTS
The electromechanical relay outputs are comprised of eight FORM C SPDT outputs. The relays are all de-
energized at power-on. Data to the relays are latched by a write to the base address.

CLK
EN
CONTROL
ASEL IRQ
IN-CIRCUIT
PROGRAMMABLE
LOGIC
SCHMITT
TRIGGER
BUFFER
JUMPER
SELECTED
FILTERS
8
ISOLATED
INPUTS
LATCHED
HIGH
CURRENT
DRIVERS
8
FORM-C
RELAYS
SPDT
ADDRESS
DECODE
LOGIC IRQ JUMPER
SELECTION
8 BITS
DIGITAL IN
PC/104 8-BIT BUS
CONTROL LINES
DATALINES
I/O CONNECTOR
I/O CONNECTOR
Figure 1-1: BLOCK DIAGRAM
Manual 104-IIRO-8(E)6

Manual 104-IIRO-8(E)7
Chapter 2: INSTALLATION
A printed Quick-Start Guide (QSG) is packed with the board for your convenience. If you’ve already performed
the steps from the QSG, you may find this chapter to be redundant and may skip forward to begin developing
your application.
The software provided with this PC/104 Board is on CD and must be installed onto your hard disk prior to use.
To do this, perform the following steps as appropriate for your operating system. Substitute the appropriate drive
letter for your CD-ROM where you see d: in the examples below.
CD Installation
The following instructions assume the CD-ROM drive is drive “D”. Please substitute the appropriate drive letter
for your system as necessary.
DOS
1. Place the CD into your CD-ROM drive.
2. Type B- to change the active drive to the CD-ROM drive.
3. Type GLQR?JJ- to run the install program.
4. Follow the on-screen prompts to install the software for this board.
WINDOWS
1. Place the CD into your CD-ROM drive.
2. The system should automatically run the install program. If the install program does not run promptly,
click START | RUN and type BGLQR?JJ, click OK or press -.
3. Follow the on-screen prompts to install the software for this board.
LINUX
1. Please refer to linux.htm on the CD-ROM for information on installing under linux.

Installing the Hardware
Before installing the board, carefully read Chapter 3 and Chapter 4 of this manual and configure the board
according to your requirements. The SETUP Program can be used to assist in configuring jumpers on the board.
Be especially careful with Address Selection. If the addresses of two installed functions overlap, you will
experience unpredictable computer behavior. To help avoid this problem, refer to the FINDBASE.EXE program
installed from the CD. The setup program does not set the options on the board, these must be set by jumpers.
To Install the Board
1. Install jumpers for selected options and base address according to your application requirements, as
mentioned above.
2. Remove power from the PC/104 stack.
3. Assemble standoff hardware for stacking and securing the boards.
4. Carefully plug the board onto the PC/104 connector on the CPU or onto the stack, ensuring proper
alignment of the pins before completely seating the connectors together.
5. Install I/O cables onto the board’s I/O connectors and proceed to secure the stack together or repeat
steps 3-5 until all boards are installed using the selected mounting hardware.
6. Check that all connections in your PC/104 stack are correct and secure then power up the system.
7. Run one of the provided sample programs appropriate for your operating system that was installed from
the CD to test and validate your installation.
Figure 2-1: PC/104 Key Information
Manual 104-IIRO-8(E)8

Manual 104-IIRO-8(E)9
Chapter 3: OPTION SELECTION
FILTER RESPONSE JUMPERS
Jumpers are used to select input filtering on a channel-by-channel basis. When jumper FLT0 is installed,
additional filtering is introduced for input bit 0, FLT1 for bit 1, etc.
JUMPER SELECTION Bit Filtered
FLT-0
-1
-2
-3
-4
-5
-6
-7
IN0
IN1
IN2
IN3
IN4
IN5
IN6
IN7
This additional filtering provides a slower response as described previously and should be used when AC inputs
are applied.
INTERRUPTS
Select the desired interrupt level by installing a jumper at one of the locations marked IRQxx. An interrupt is
asserted by the board when an input data bit changes state if software enabled as previously described.

15
P1
10234567
FILTERS
ADDRESS
IRQs
IRQs 234567
15
14
12
11
10 A2 A9
0
Figure 3-1: OPTION SELECTION MAP
Manual 104-IIRO-8(E)10

Manual 104-IIRO-8(E)11
Chapter 4: ADDRESS SELECTION
The board occupies four consecutive addresses in I/O space. The base or starting address can be selected
anywhere within the I/O address range 100-3FF (except 1F0 through 1F8) for AT's and 200-3FF for XT's
provided that it does not cause an overlap with other functions. If the addresses of two installed functions
overlap, you will experience unpredictable computer behavior. The FINDBASE program will assist you in
selecting a base address that will avoid this conflict.
Table 4-1: ADDRESS ASSIGNMENTS FOR COMPUTERS
HEX RANGE USAGE
000-00F
020-021
040-043
060-06F
070-07F
080-09F
0A0-0BF
0C0-0DF
0F0-0F1
0F8-0FF
170-177
1F0-1F8
200-207
238-23B
23C-23F
278-27F
2B0-2BF
2C0-2CF
2D0-2DF
2E0-2E7
2E8-2EF
2F8-2FF
300-30F
310-31F
320-32F
370-377
378-37F
380-38F
3A0-3AF
3B0-3BB
3BC-3BF
3C0-3CF
3D0-3DF
3E8-3EF
3F0-3F7
3F8-3FF
8237 DMA Controller 1
8259 Interrupt
8253 Timer
8042 Keyboard Controller
CMOS RAM, NMI Mask Reg, RT Clock
DMA Page Register
8259 Slave Interrupt Controller
8237 DMA Controller 2
Math Coprocessor
Math Coprocessor
Fixed Disk Controller 2
Fixed Disk Controller 1
Game Port
Bus Mouse
Alt. Bus Mouse
Parallel Printer
EGA
EGA
EGA
GPIB (AT)
Serial Port
Serial Port
reserved
reserved
Hard Disk (XT)
Floppy Controller 2
Parallel Printer
SDLC
SDLC
MDA
Parallel Printer
VGA EGA
CGA
Serial Port
Floppy Controller 1
Serial Port
The base address is set up by JUMPERS. Those jumpers control address bits A2 through A9. (Lines A1 and A0
are used on the board to control individual registers. How these two lines are used is described in the
Programming section of this manual.)

Manual 104-IIRO-8(E)12
To determine how to set these JUMPERS for a desired hex-code address, refer to the SETUP program provided
with the board. If you prefer to determine proper jumper settings yourself, first convert the hex-code address to
binary form. Then, for each "0", install corresponding jumpers and for each "1", remove the corresponding
jumper.
The following example illustrates jumper selection corresponding to hex 300 (or binary 11 0000 00xx). The "xx"
represents address lines A1, and A0 used on the board to select individual registers as described in the
Programming section of this manual.
Base Address in Hex Code 0 03
Conversion Factors 4 2 1 8 42 1 8
Binary Representation 1 1 0 0 0 0 0 0
Jumper Legend A A A A3 A2A9 A8 A7 6 5 4
Addr. Line Controlled A A A A3 A2A9 A8 A7 6 5 4
Jumper Selection N O O ONOFF OFF ON ON N ON
Carefully review the address selection reference table on the preceding page before selecting the board
address. If the addresses of two installed functions overlap, you will experience unpredictable computer
ehavior.
b

Manual 104-IIRO-8(E)13
Chapter 5: PROGRAMMING
The board occupies four consecutive addresses in PC I/O space. The base or starting address is selected during
installation and will fall on an eight-byte boundary. The read and write functions are as follows (Model E does not
use Base +2):
I/O Address Read Write
Base +0
Base +1
Base +2
Base +3
N/A
Read Isolated Inputs
Enable IRQ
Read digital inputs
Write Relay Output
N/A
Disable IRQ
N/A
ISOLATED DIGITAL INPUTS
Isolated digital input states are read as a single byte from the port at Base Address +1. Each of the eight bits
within the byte corresponds to a particular digital input. A "1" signifies that the input is energized and a "0"
signifies that the input is de-energized.
Bit Position D7 D6 D5 D4 D3 D2 D1 D0
Iso Digital Input IN7 IN6 IN5 IN4 IN3 IN2 IN1 IN0
The board response to inputs is rated at 10 uSec. Sometimes it is necessary to slow down that response to
accommodate AC inputs or in noisy environments. Hardware installation of JUMPERS to implement filtering is
provided.
The board supports interrupts on change of state of isolated digital inputs. Thus, it is not necessary to
continuously poll inputs (by reading at base address +1) to detect any state change. To enable this interrupt
capability, read at base address +2. To disable interrupts, write at base address +2 or remove the jumper that
selects interrupt level IRQ2 through IRQ7, IRQ10 through IRQ12, IRQ14, or IRQ15. To clear an IRQ, write to
base address +1.
DIGITAL INPUTS
Digital input states are read as a single byte from the port at Base Address +3. Each of the eight bits within the
byte corresponds to a particular digital input. A "1" signifies that the input is high and a "0" signifies that the input
is low.
Bit Position D7 D6 D5 D4 D3 D2 D1 D0
Digital Input DI7 DI6 DI5 DI4 DI3 DI2 DI1 DI0

Manual 104-IIRO-8(E)14
RELAY OUTPUTS
At power-up, all relays are initialized in the de-energized state. The relay outputs are controlled by writing to the
Base Address. Data are written to all eight relays as a single byte. Each bit within the byte controls a specific
relay. A "1" energizes the corresponding relay and a "0" turns it off.
Bit Position D7 D6 D5 D4 D3 D2 D1 D0
Relay Contr'd OUT7 OUT6 OUT5 OUT4 OUT3 OUT2 OUT1 OUT0
For example, if bit D5 is turned on by writing hex DF to the base address, then the relay that controls OUT5 is
energized closing the associated normally-open contacts. All other relays would be de-energized and their
normally-closed contacts would be closed.
PROGRAMMING EXAMPLES
No driver software is provided with the board because programming is very simple and can be accomplished
most efficiently using direct I/O instructions in the language that you are using. The following examples are in C
but are readily translated into other languages:
Example: Turn on OUT0 and OUT7
Base=0x300 //Base I/O address
outportb(Base, 0x7E);
Example: Read back the state of the relays
X=inportb(Base); //relay register data to X
printf(“%02x”); //display results
Example: Read the digital inputs
Y=inportb(Base+1); //digital input register to Y
SOFTWARE
Utility software provided on CD with the board is the base address locator, an illustrated setup program and a
sample program. The sample program sequentially turns on each relay until all
are on and then sequentially turns them off. After each relay is turned on, the
relay states are read back, the opto-isolated inputs are read, and the data are
displayed.
The sample programs are in forms suitable for use with, QuickBASIC, C, and Pascal. The programs as follows:
FINDBASE: Program locates active and available port addresses.
SETUP: Board Setup Program
CSAMPLES: SAMPLE1 This sample program will sequentially turn on all bits of the relay input and
sequentially turns them off. Each time it sets a new bit, both the relay output and
the relay input are read and the data displayed. This demonstrates how to read
and write to a port.
BSAMPLES: SAMPLE1Same sample in Quickbasic

Chapter 6: CONNECTOR PIN ASSIGNMENTS
Isolated inputs, digital inputs and relay outputs are connected to the board via a 50-pin HEADER type connector
P1. The mating connector is an IDC type with 0.1 inch centers or equivalent. The wiring may be directly from the
signal sources or may be on ribbon cable from screw terminal accessory boards. Pin assignments follow.
PIN NAME FUNCTION
1OUT7-C Bit 7 Relay Common
2OUT6-C Bit 6 Relay Common
3OUT7-NC Bit 7 Relay, Normally-Closed Contact
4OUT6-NC Bit 6 Relay, Normally-Closed Contact
5OUT7-NO Bit 7 Relay, Normally-Open Contact
6OUT6-NO Bit 6 Relay, Normally-Open Contact
7OUT5-C Bit 5 Relay Common
8OUT4-C Bit 4 Relay Common
9OUT5-NC Bit 5 Relay, Normally-Closed Contact
10 OUT4-NC Bit 4 Relay, Normally-Closed Contact
11 OUT5-NO Bit 5 Relay, Normally-Open Contact
12 OUT4-NO Bit 4 Relay, Normally-Open Contact
13 OUT3-C Bit 3 Relay Common
14 OUT2-C Bit 2 Relay Common
15 OUT3-NC Bit 3 Relay, Normally-Closed Contact
16 OUT2-NC Bit 2 Relay, Normally-Closed Contact
17 OUT3-NO Bit 3 Relay, Normally-Open Contact
18 Out2-NO Bit 2 Relay, Normally-Open Contact
19 OUT1-C Bit 1 Relay Common
20 OUT0-C Bit 0 Relay Common
21 OUT1-NC Bit 1 Relay, Normally-Closed Contact
22 OUT0-NC Bit 0 Relay, Normally-Closed Contact
23 OUT1-NO Bit 1 Relay, Normally-Open Contact
24 OUT0-NO Bit 0 Relay, Normally-Open Contact
25 IIN7 A Isolated Input 7 A
26 IIN7 B Isolated Input 7 B
27 IIN6A Isolated Input 6 A
28 IIN6 B Isolated Input 6 B
29 IIN5 A Isolated Input 5 A
30 IIN5 B Isolated Input 5 B
31 IIN4 A Isolated Input 4 A
32 IIN4 B Isolated Input 4 B
33 IIN3 A Isolated Input 3 A
34 IIN3 B Isolated Input 3 B
35 IIN2 A Isolated Input 2 A
36 IIN2 B Isolated Input 2 B
37 IIN1 A Isolated Input 1 A
38 IIN1 B Isolated Input 1 B
39 IIN0 A Isolated Input 0 A
40 IIN0 B Isolated Input 0 B
41 DIN 0 Digital Input Bit 0
42 DIN 1 Digital Input Bit 1
43 DIN 2 Digital Input Bit 2
44 DIN 3 Digital Input Bit 3
45 DIN 4 Digital Input Bit 4
46 DIN 5 Digital Input Bit 5
47 DIN 6 Digital Input Bit 6
48 DIN 7 Digital Input Bit 7
49 GND Digital Ground
50 GND Digital Ground
Manual 104-IIRO-8(E)15

Manual 104-IIRO-8(E)16
Chapter 7: SPECIFICATIONS
ISOLATED INPUTS
Number of inputs: Eight
Type: Non-polarized, optically isolated from each other and from the computer.
(CMOS compatible)
Voltage Range: 3 to 28 DC or AC Rms (40 to 10000 Hz)
Isolation: 60V channel-to-ground or channel-to channel
Input Resistance: 1.8K ohms in series with opto-coupler
Response Time: 4.7 mSec w/filter, 10 uSec w/o filter (typical)
Interrupts: Software controlled with jumper IRQ selection (basic model only)
DIGITAL INPUTS
Number of inputs: Eight inputs with 10K pullup (TTL/CMOS compatible)
RELAY OUTPUTS
Number of outputs: Eight SPDT form C
Contact Rating: 1A max at 24VDC, 60VDC max, 0.5A at 125VAC max
Contact Type: Single crossbar, Ag with Au clad, (Bifurcated contacts optional)
Contact Resistance: Initial 100 milliohms maximum
Contact Life: mech'l: 5 million operations minimum
Operating Time: 5 milliseconds maximum
Release Time: 5 milliseconds maximum
INTERRUPTS: Interrupts are generated when isolated inputs change state and when enabled
by software (basic model only).
POWER REQUIRED: +5VDC @ 0.4 A (all relays ON)
ENVIRONMENTAL
Ambient Temperature: Operating: -30oto +70oC (Non-Icing)
Weight: Approx. 4 oz.

Customer Comments
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at: [email protected]. Please detail any errors you find and include your mailing address so that
we can send you any manual updates.
10623 Roselle Street, San Diego CA 92121
Tel. [phone] FAX [phone]
www.accesio.com
Manual 104-IIRO-8(E)17