United Kingdom:One Omega Drive, River Bend Technology Centre
ISO 9002 CertifiedNorthbank, Irlam, Manchester
M44 5BD United Kingdom
TEL: +44 (0)161 777 6611FAX: +44 (0)161 777 6622
Toll Free in United Kingdom: 0800-488-488
e-mail: sales@omega.co.uk
OMEGAnet®Online Service Internet e-mail
www.omega.com info@omega.com
It is the policy of OMEGA to comply with all worldwide safety and EMC/EMI regulations that
apply. OMEGA is constantly pursuing certification of its products to the European New Approach
Directives. OMEGA will add the CE mark to every appropriate device upon certification.
The information contained in this document is believed to be correct, but OMEGA Engineering, Inc. accepts
no liability for any errors it contains, and reserves the right to alter specifications without notice.
WARNING: These products are not designed for use in, and should not be used for, patient-connected applications.
The OMG-PCI-DIO48 provides two 8255 mode 0 compatible ports providing
four eight-bit ports and four four-bit ports. Each can be individually configured
as inputs or outputs. When configured as outputs each bit of the four bit ports
may be set or reset individually.
What’s Included
The OMG-PCI -DIO48 is shipped with the following items. If any of these items
is missing or damaged, contact the supplier.
• OMG-PCI-DIO48 Adapter
• Software
• Industry Standard Relay Rack Cables are Available:
Part number CA135 for Edge Connection
Part number CA167 for IDC Connection
Installation
Card Setup
The OMG-PCI -DIO48 is a fully compliant PCI ‘Plug and Play’ adapter. All card
resources (i.e. I/O address, IRQ selection) are auto-assigned by either your
system BIOS or your ‘Plug and Play’ operating system.
Software Installation
For proper operation install software first. To install the software place the CD in
your CD-ROM tray and the auto-run program will start. If auto-run is not
available browse the CD and choose “index.htm”. Choose Install Software at the
beginning of the CD. Select the Digital I/O software drivers and install SeaIO
prior to installing hardware.
Linux Users
Refer to the installation instructions at the beginning of the CD for details on
installing the digital I/O cards in Linux.
OMG-PCI -DIO48 Page 1
Introduction and Installation
System Installation
The OMG-PCI -DIO48 can be installed in any of the PCI expansion slots.
1. Turn off PC power. Disconnect the power cord.
2. Remove the PC case cover.
3. Locate an available PCI slot and remove the blank metal slot cover.
4. Remove the clamping portion of the bracket from the card.
5. Gently insert the OMG-PCI-DIO48 into the slot. Make sure that the
adapter is seated properly.
6. Feed the two 50-pin ribbon cables through the cutout bracket and
connect them to the card.
7. Replace the bracket retaining screw.
8. Install the clamping portion of the bracket
9. Replace the computer cover.
10. Connect the power cord. Installation is complete.
OMG-PCI -DIO48 Page 2
Technical Description
Technical Description
The OMG-PCI -DIO48 provides 48 channels of digital I/O configurable as inputs or outputs, which
can be utilized for PC based control and automation including sensors, switches, satellite antenna
control systems, video and audio studio automation, security control systems, and other industrial
automation systems.
Software
The OMG-PCI-DIO48 ships with the SeaI/O suite of Windows 98/NT/ME/2000 drivers. SeaI/O
provides the user with a consistent and straightforward API, allowing the developer to concentrate
on the details of the application as opposed to low level driver development. Popular development
environments, including Visual C++, Visual Basic, and Delphi, are supported for application
development. SeaI/O includes a utility for configuring the driver parameters under Windows,
further simplifying installation.
Linux Users
The OMG-PCI -DIO48 ships with software for Linux, including a kernel-mode driver, API, and the
SeaIOTst diagnostic tool. The kernel-mode driver is provided as a module, so future driver
upgrades may be performed with minimal (usually zero) downtime. The Linux API is identical to its
Windows counterpart, facilitating quick and easy ports of existing SeaI/O-awareapplications to the
Linux operating system. All source code for the Linux software suite is provided under the GNU
Public License (GPL v2.0), to assist in "roll-your-own"-type applications.
OMG-PCI -DIO48 Page 3
Technical Description
3rd Party Software Support
Third party software support for many HMI/MMI and other process control software is included
on the product installation CD. For the most up to date information on third party software support,
please visit http://www.omega.com.
OMG-PCI -DIO48 Page 4
Technical Description
Electrical Characteristics
The table below provides the electrical characteristics of each Input/Output. Each port is buffered
with a 74LS245 octal bi -directional transceiver. Each input is capable of sinking up to
24 mA, while each output can source up to 15 mA.
Recommended Operating Conditions
Min Max
Input 0 V 5.25 V
Source 15 mA
Sink 24 mA
Electrical Characteristics
High Level Input Voltage Min 2 V
Low Level Input Voltage Max 0.8 V
High Level Output Voltage
Typically 3.4 V at 3 mA
Low Level Output Voltage Max 0.55 V at 24 mA
Min 2 V at 15 mA
Figure 1-Electrical Characteristics
OMG-PCI -DIO48 Page 5
Technical Description
Pull Ups
Ten pin bussed resistor packs are installed to provide pull-ups to the input ports. These are
installed on all ports. The pull-up resistor packs are rated at 10K ohms. Figure 2 below provides the
bussed resistor and corresponding port. The resistors insure that no line is floating which is not
connected. This provides consistent biasing on all un-terminated lines.
Bussed Corresponding
Resistor Port Resistor Port
RP4 Port A1 RP1 Port A2
RP5 Port B1 RP2 Port B2
RP6 Port C1 RP3 Port C2
Bussed Corresponding
Figure 2-Pull Up Resistors
OMG-PCI -DIO48 Page 6
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