SCIDYNE XIO-DI8 Assembly instructions

USER’S REFERENCE MANUAL
XIO-DI8
External I/O - 8 Channel Digital Input Interface
Model No. 100-7656
Doc. No. M7656 Rev: 1.1 06/20/06
649 School Street / Pembroke, MA 02359 USA / Tel: [phone]
www.scidyne.com

© Copyright 2002 - 2006
SCIDYNE
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Previous revision: 1.0 09/18/02
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Table of Contents
Introduction ........................................................................1
BoardSetup ........................................................................3
PowerSourceSelectionJumper(J1) ..................................................3
HostPortSelection ...............................................................3
AC Input Filters ..................................................................4
Configuring Input Voltage Ranges ...................................................5
ApplicationInformation ..............................................................6
HostConnections .................................................................6
Shared Ribbon Cables .............................................................6
Using Multiple XIO-DI8 Boards .....................................................6
Specifications.......................................................................7
AppendixA-MechanicalDimensions ...................................................8

Conventions and Terminology Used Throughout This Publication
Safety and Usage Conventions
NOTE: Contains important information and useful tips that will assist in the
understanding and operation of the product.
CAUTION: Calls attention to a procedure, practice or condition that could
possibly cause personal injury or damage to equipment.
WARNING: Calls attention to a procedure, practice or condition that could
possibly cause severe bodily injury, death or extensive equipment damage.
Terminology
Host This is the computer or similar device which controls the XIO-DI8 operation.
Logic conditions Unless otherwise noted, logic signals are designated as TRUE (Set) and FALSE (Clear).
Names with an asterisk (*) postscript are inverted or active low. Unless otherwise noted TRUE is
considered logic “1” (+5vdc) and FALSE is logic “0” (0vdc).
Numbering Systems Computerized equipment often requires its numeric data to be represented in different
forms depending on the audience and information being conveyed. Decimal numbers are typically used for
end-user data entry and display while internally these values are converted and manipulated in native binary.
Hexadecimal numbers are often used by programmers as an intermediate level between binary and decimal
notations.
Base Name Format (MS <---> LS)
2 Binary 1011 10012
10 Decimal 185
16 Hexadecimal 0xB9 or B916 or &HB9.

1
Introduction
The XIO-DI8 is an eight channel digital input board which allows low level digital inputs, as found on
Single-Board-Computers and similar devices, to monitor external AC and DC signals. It features eight
opticaly coupled input channels offering 500 volt isolation.
CAUTION: The 500V isolation specification applies only to input-to-host potential and
not the potential between individual I/O channels even though all I/O channels are isolated from
each other. The maximum “input side” inter-channel potential is limited to 250V.
Each channel may be indiviudally configured to measure a wide range of voltages. In addition, all channels
have input low-pass filters which can be independently enabled to allow AC frequencies as low as 40hz to
be sensed reliably. Also included are status LEDs which show overall board operation. Connections to the
host is made through a 50 position or 26 position IDC ribbon cable connectors. The connectors follow the
two most common arrangements for digital port pinouts. External field connections are made through a
single 16-position removable screw-terminal strip which can accommodate wires as large as 12AWG
Versatile mounting options include using standoffs, SNAPTRACK®, or mounting on a DIN rail. Power for
the XIO-DI8 is supplied by the host or provided externally through a two position removable screw-terminal
strip.
+5
GND
GND
+5
HOST
EXT
POWER
SOURCE
SELECTION
DIGITAL OUTPUT
CONNECTIONS
50 PIN
IDC
26 PIN
IDC
POWER ON
INDICATOR
STATUS
LED
EXT POWER
2-POS
REMOVABLE
TERMINAL STRIP
16-POS
REMOVABLE
TERMINAL STRIP
#1
#2
#3
#4
#5
#6
#7
Vcc
Vcc
INPUT CIRCUIT #7
INPUT CIRCUIT #6
INPUT CIRCUIT #5
INPUT CIRCUIT #4
INPUT CIRCUIT #3
INPUT CIRCUIT #2
INPUT CIRCUIT #1 EIGHT DIGITAL
INPUTS
8-BITS
8-BITS
8-BITS
Vcc
AC
INPUT
FILTER
22k
BUFFER \
DRIVER
B7
B6
B5
B4
B3
B2
B1
B0
RN1
B5
B2
B0
B1
B3
B4
B6
B7
B3
B2
B1
B0
B6
B4
B5
B7
B0
B6
B3
B1
B2
B5
B4
B7
RN2
SOCKET
RN3
SOCKET
SELECT PORT BY
INSTALLING ONE
RESISTOR NETWORK
SCHMITT-
TRIGGER
4.7uf
INPUT CIRCUIT #0
OPTO-
ISOLATOR
Rin
330
IN0-A
IN0-B
SURGE
PROTECTION
CIRCUITRY
TYPICAL HOST
PORT CIRCUITRY
PORT 0
PORT 1
PORT 2
82C55
PERIPHERAL
INTERFACE
TO / FROM OTHER
USER CIRCUITRY
(INPUTS)
SIMPLIFIED BLOCK DIAGRAM
PORT0
PORT0
XIO-DI8
PORT1
PORT1
PORT2
PORT2
Figure 1 - XIO-DI8 Block Diagram

2
Figure 2 - Component Identification
Component Identification
Before the XIO-DI8 can be put into service it must be properly configured for the intended application. This
is accomplished by placing shorting jumpers, setting switches, and installing input resistors located at
various locations on the board. The component identification is shown in Figure 2. Each XIO-DI8 comes
from the factory set with a default configuration. The user is free to change the default configuration to
satisfy any particular application requirements and the settings are fully described in subsequent sections
of this manual.
XIO-DI8 Component Identification
Item Description
1
Digital Input IDC Headers (CON1, CON2) These two headers output the digital signals to the host device. Only one
header is generally used.
CON1: 50-Pin IDC
CON2: 26-Pin IDC
2Power ON Indicator This LED is illuminated whenever logic power is present on the XIO-DI8 board.
3
AC Input Filter Switches (SW1) These eight switches correspond to the eight digital inputs. A switch in the “ON”
or “CLOSED” position activates a low-pass filter for the respective digital input and enables reliable AC signal
monitoring.
Note: Position #1 corresponds to digital input IN0 and so on.
4Input Status Indicators These eight LEDs are illuminated whenever their corresponding input is activated and the
XIO-DI8 is powered on.
5
Input Resistors (R1 - R8) These eight socketed resistors correspond to the eight inputs. Their ohmic value determines
the voltage range the input can measure.
NOTE: These resistor must be correctly selected and installed for safe and reliable operation.
6Input Connector (CON4) This 16-position removable screw terminal strip is used to connect field wiring to the XIO-
DI8.
7
Host Port Selection Resistor Networks (RN1, RN2, RN3) Installing a resistor network in one of these three sockets
determines which host port of CON1 or CON2 the XIO-DI8 will drive.
RN1 = PORT-0, RN2 = PORT-1, RN3 = PORT-2
8External Logic Power Input Connector (CON3) Logic Power from an external +5Vdc source is applied to the XIO-
DI8 through this 2-position removable screw terminal strip.
9Power Source Selection Jumper (J1) This jumper block determines whether logic power for the XIO-DI8 will come
from the HOST (via CON1 or CON2) or an EXTernal power source through connector CON3.

3
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
Figure 3 - Resistor Network
Board Setup
Power Source Selection Jumper (J1)
Power for the XIO-DI8 logic circuits can be derived from either the Host (controlling device) or an external
supply. The selection is made by placing a shorting jumper at the appropriate location of jumper block J1.
HOST - With the shorting jumper is in the HOST position, power is supplied by the controlling
device through either of the two digital IDC headers, CON1 or CON2.
EXT - This is the factory default position. When the shorting jumper is in the EXT position, power
is provided by an external +5Vdc supply through screw terminal connector CON3
NOTE: A XIO-DI8 requires a clean +5Vdc ±5% at approximately 125ma max. to operate properly.
CAUTION: Be careful when using external supplies.. Although the XIO-DI8 has special circuitry to withstand
momentary over-voltages and reversed polarity, the board can be permanently damaged if subjected to these conditions
for extended periods of time.
Host Port Selection
The XIO-DI8 accomodates three 8-bits ports but uses only one of them when driving the host device. The
selection of which port will be used is determined by installing a resistor network in one of three DIP
sockets as shown in the following table.
Host Port Selection
Driven Port RNET Installation Position
PORT-0 RN1
PORT-1 RN2
PORT-2 RN3
Resistor Network
The host port selection resistor network contains eight separate resistors in
a standard 16-Pin Dual-Inline-Package (0.3" DIP) as shown in figure 3.
The ohmic value must be high enough to provide suffient protection for the
XIO-DI8 drivers in case of accidental cabling short circuits or if the host
port is inadvertantly made to function as outputs. However, it must also be
low enough to reliably drive the host input circuitry. For practically all
applications the 47Sresistor network supplied with the XIO-DI8 is
suitable.

4
AC Input Filters
The optical isolators used in the digital input circuitry are designed to accept AC signals. However, by its
very nature, an optical isolator driven by an AC signal will momentarily switch between logic states as it
crosses through zero volts while changing polarity. Depending on when the host application reads the port,
the signal can be misinterpreted even though a steady AC signal is applied. To overcome this condition the
XIO-DI8 is equipped with a low-pass filter on each of the inputs. DIP switch SW1 is used to selectively
enable a filter for each input. A switch in the “ON” or “CLOSED” position enables the filter for that
particular digital input.
NOTE: The input filters are after the optical isolation and do not affect the input impedanceas seen by the
field circuirty.
NOTE: Inputs which are controlled by DC signals may also benefit by using the AC filters. If the input is
being driven over a long distance or if the DC signal is excessively noisy enabling the filter can help minimize
erroneous readings.
AC Input Filter Selection
SW1 Position Digital Input
-1 IN0
-2 IN1
-3 IN2
-4 IN3
-5 IN4
-6 IN5
-7 IN6
-8 IN7

5
(1) Input Resistor Value
Common Input Voltage / Resistor Values
Input Voltage Input
Resistor (Ohms)
SCIDYNE
Stock Number
5 1K 101 - 0157
24 5.6K 101 - 0158
48 12K 101 - 0159
120 27K 101 - 0160 (2) Input Resistor Power Dissipation
Input Resistor Designation
Channel Resistor
IN0 R1
IN1 R2
IN2 R3
IN3 R4
IN4 R5
IN5 R6
IN6 R7
IN7 R8 Figure 5 - Input Resistor Mechanical Specifications
Configuring Input Voltage Ranges
All digital input channels of the XIO-DI8 have indentical circuitry as shown in figure 4. For each channel
a single socketed resistor (Rin) is used to limit the input current. Its ohmic value is selected to allow a
approximately 4.0ma of current flow when the input is driven at the desired input voltage. Higher input
voltages can be tolerated but the input current must never exceed 25ma or XIO-DI8 input circuitry can be
damaged. In addition, the power disapated by the resistor must be considered and limited to below 1.4watts
RMS.
STATUS
LED
Vcc
AC
INPUT
FILTER
22k SCHMITT-
TRIGGER
4.7uf
OPTO-
ISOLATOR
Rin
330
IN-A
IN-B
To Buffer and
Port Selection
Vin
Figure 4 - Digital Input Circuitry (one channel shown)
The table below provides resistor values for common input voltages. However, other input voltages can be
eaisly accomodated by calculating resistor values from the formulas provided.

6
Digital Output Connections to Host Device
Output Header PORT.BIT Digital
Input
CON1 Pin
(IDC-50)
CON2 Pin
(IDC-26) STD ALT-1 ALT-2
1 1 P0.7 P0.0 P2.7 7
3 2 P0.6 P0.1 P2.6 6
5 3 P0.5 P0.2 P2.5 5
7 4 P0.4 P0.3 P2.4 4
9 5 P0.3 P0.4 P2.3 3
11 6 P0.2 P0.5 P2.2 2
13 7 P0.1 P0.6 P2.1 1
15 8 P0.0 P0.7 P2.0 0
17 9 P1.7 P1.0 P1.7 7
19 10 P1.6 P1.1 P1.6 6
21 11 P1.5 P1.2 P1.5 5
23 12 P1.4 P1.3 P1.4 4
25 13 P1.3 P1.4 P1.3 3
27 14 P1.2 P1.5 P1.2 2
29 15 P1.1 P1.6 P1.1 1
31 16 P1.0 P1.7 P1.0 0
33 17 P2.7 P2.0 P0.7 7
35 18 P2.6 P2.1 P0.6 6
37 19 P2.5 P2.2 P0.5 5
39 20 P2.4 P2.3 P0.4 4
41 21 P2.3 P2.4 P0.3 3
43 22 P2.2 P2.5 P0.2 2
45 23 P2.1 P2.6 P0.1 1
47 24 P2.0 P2.7 P0.0 0
49 25 +5V
2 - 50 26 COM
STD = Standard Pinout
ALT = Alternate Pinout
Application Information
Host Connections
The host attaches to the XIO-DI8 through one of two IDC ribbon headers, CON1 or CON2. The pinout for
these headers conform to two common industry standards. Other connection arrangements, such as a 37-pin
D-SUB, are easily accommodated using simple custom cable assemblies.
Some board manufactures offer an alternative
pinout which reverses the bit order within
each port (shown as ALT-1) or may transpose
the locations of PORT-0 and PORT-2
altogether (shown as ALT-2). The XIO-DI8
works equally well in all these configurations
provided the application developer observes
the relationship between the ports, bits and the
actual XIO-DI8 digital input channels. For
convenience, a few different arrangements are
depicted in the table to the right.
Shared Ribbon Cables
It is not uncommon for manufacturers to
combine all I/O signals (analog, digital,
counters, etc.) on the same IDC ribbon
connector. When connecting the XIO-DI8 to
these devices, only the digital signals should
be routed to the XIO-DI8. This is generally
accomplished by “stripping-out” that section
of the ribbon cable which contain only the
digital signals being used.
Using Multiple XIO-DI8 Boards
Multiple boards can be used by a single host
device by associating each 8-bit host port to a
separate XIO-DI8 or other SCIDYNE XIO
family members.