SeaLevel SeaI/O-270U User manual

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© Sealevel Systems, Inc. 270U Manual | SL9179 12/2022
Optically Isolated 7-Port USB Hub
with SeaLATCH USB Ports
User Manual | 270U

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© Sealevel Systems, Inc. 270U Manual | SL9179 12/2022
Contents
CONTENTS...........................................................................................................................................................2
SAFETY INSTRUCTIONS ..................................................................................................................................... 3
INTRODUCTION ................................................................................................................................................... 4
BEFORE YOU GET STARTED ...............................................................................................................................5
INSTALLATION ....................................................................................................................................................7
HARDWARE DESCRIPTION ................................................................................................................................. 8
SEALATCH® USB ..............................................................................................................................................10
MOUNTING OPTIONS........................................................................................................................................12
TECHNICAL SPECIFICATIONS..........................................................................................................................13
APPENDIX A – TROUBLESHOOTING................................................................................................................14
APPENDIX B – HOW TO GET ASSISTANCE .....................................................................................................15
APPENDIX C – SILK SCREEN – SEAI/O-270U PCB .........................................................................................16
APPENDIX D – 270U BOARD MOUNTING OUTLINE........................................................................................17
APPENDIX E – COMPLIANCE NOTICES...........................................................................................................18
WARRANTY ........................................................................................................................................................19

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© Sealevel Systems, Inc. 270U Manual | SL9179 12/2022
Safety Instructions
Electrostatic Discharges (ESD)
A sudden electrostatic discharge can destroy sensitive components. Proper packaging and earthing
rules must therefore be observed. Always take the following precautions.
•Transport boards and cards in electrostatically secure containers or bags.
•Keep electrostatically sensitive components in their containers, until they arrive at an
electrostatically protected workplace.
•Only touch electrostatically sensitive components when you are properly earthed.
•Store electrostatically sensitive components in protective packaging or on anti-static mats.
Grounding Methods
The following measures help to avoid electrostatic damages to the device:
•Cover workstations with approved antistatic material. Always wear a wrist strap
connected to workplace as well as properly grounded tools and equipment.
•Use antistatic mats, heel straps, or air ionizers for more protection.
•Always handle electrostatically sensitive components by their edge or by their casing.
•Avoid contact with pins, leads, or circuitry.
•Turn off power and input signals before inserting and removing connectors or connecting
test equipment.
•Keep work area free of non-conductive materials such as ordinary plastic assembly aids
and Styrofoam.
•Use field service tools such as cutters, screwdrivers, and vacuum cleaners which are
conductive.
•Always place drives and boards PCB-assembly-side down on the foam.

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© Sealevel Systems, Inc. 270U Manual | SL9179 12/2022
Introduction
The SeaI/O-270U is an optically isolated 7-port USB hub that protects the host computer from spikes,
surges and ground loops commonly found in industrial environments. The hub is powered by an industrial
grade wall-mount power supply providing a full 500mA to each attached USB peripheral. The SeaI/O-270U
is ideal for adding USB ports to a SeaPAC touchscreen HMI system, a Relio R1000 embedded solid-state
industrial computer, or a SeaI/O data acquisition “stack”.
The SeaI/O-270 integrates SeaLATCH USB ports, which are fully compatible with standard USB cables.
When used with the included USB cable with a SeaLATCH type B USB connector, the metal thumbscrew
provides a secure metal-to-metal connection to the hub and prevents accidental cable disconnection. The
hub’s seven SeaLATCH type A USB connectors can secure USB peripherals to the hub in the same way.
Additionally, a highly-retentive type B USB connector helps prevent unintentional separation from a
standard USB cable.
Features
•Provides 1500 VAC isolation on upstream USB port
•Includes 7 USB downstream ports with 500mA available per port
•SeaLATCH USB connectors provide locking connection
•Native support in Windows 98SE/ME/2000/XP/Vista/7™, and Linux kernel v2.4 operating systems
•Status LEDs indicate external power, connection to host, and fault condition
•High-retention USB type “B” connector prevents accidental disconnection of standard USB cable

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© Sealevel Systems, Inc. 270U Manual | SL9179 12/2022
Before You Get Started
What’s Included
The SeaI/O-270U is shipped with the following items. If any of these items is missing or damaged, please
contact Sealevel for replacement.
•SeaI/O-270U – SeaI/O 7-Port Isolated USB Hub
•CA356 – USB Type A to SeaLATCH USB Type B Cable, 6’ in Length
•TR123 – 12VDC @ 2.5A Wall-Mount Power Supply
Advisory Conventions
Warning
The highest level of importance used to stress a condition where damage could result to the
product, or the user could suffer serious injury.
Important
The middle level of importance used to highlight information that might not seem obvious or a
situation that could cause the product to fail.
Note
The lowest level of importance used to provide background information, additional tips, or other
non-critical facts that will not affect the use of the product.

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© Sealevel Systems, Inc. 270U Manual | SL9179 12/2022
Optional Items
Depending upon your application, you are likely to find one or more of the following items useful with the
SeaI/O-270U. All items can be purchased from our website or by calling [phone].
SeaLATCH USB Type A and Type B Device Cable, 72” (Item# CA332)
The CA332 is a USB device cable with SeaLATCH USB type A and type B
connectors. The metal thumbscrew on each connector provides a secure
metal-to-metal connection to devices with SeaLATCH USB ports.
SeaLATCH USB Type A to USB Type B Device Cable, 72” (Item# CA355)
The CA355 is a USB device cable with a SeaLATCH USB type A connector and
standard type B connector. This cable secures the HUB7M to legacy USB
peripheral devices.
USB Type A to SeaLATCH Type B Device Cable, 72” (Item# CA356)
The CA356 is a USB device cable with a SeaLATCH USB type B connector and
standard type A connector. This cable is included with all Sealevel USB
products with an integrated SeaLATCH type B USB port.
USB Type A to USB Type A, 3 Meter Extension Cable (Item# CA214)
The CA214 is a fully rated USB extension cable that adds three meters to any
existing USB cable (maximum 5 meters). The CA214 has a type A male
connector on one end and a type A female connector on the other end.
USB Type A to USB Type B, 72” Device Cable (Item# CA179)
The CA179 is a 72" USB device cable that connects USB peripherals with a
Type B connector to the Type A connector on a host computer. The CA179 is
USB 2.0 compliant and is compatible with USB 1.1 and 1.0 devices.
USB Type A to USB Type B, 5 Meter Device Cable (Item# CA215)
The CA215 is a fully rated 5 meter device cable that connects USB peripherals
with a type B connector to the type A connector on a host PC. This cable
provides the maximum 5 meters (16 feet) for a USB connection.

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© Sealevel Systems, Inc. 270U Manual | SL9179 12/2022
Installation
Windows 98/ME/2000/XP/Vista/7™ Operating Systems
1. The SeaI/O-270U is fully supported as a generic USB hub device in Windows
98/ME/2000/XP/Vista/7™ operating systems and requires no separate driver.
2. Simply connect the included wall-mount power supply to the SeaI/O-270U and connect to an AC
outlet.
3. Using the included SeaLATCH USB device cable, plug the SeaI/O-270U into an available USB port
on your host system.
4. The ‘Found New Hardware’ screen will appear, and the hub will be automatically recognized as a
generic USB hub device.
5. The hub is ready to use when you see the screen ‘Your USB hub is installed and ready to use.’
Windows NT is not USB aware and thus cannot support this device.
Linux Support
USB devices are supported to Linux kernel v2.4 or better. Refer to the help files included with your Linux
distribution for specific instructions on adding generic USB hub devices.

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© Sealevel Systems, Inc. 270U Manual | SL9179 12/2022
Hardware Description
Optical Isolation
The SeaI/O-270U is an optically isolated USB hub that connects up to seven USB peripherals while
protecting the host computer from voltages up to 1500 VAC. This protects the host computer from
potentially damaging voltage spikes, power surges, and ground loops commonly found in industrial and
OEM applications.
USB Ports
The SeaI/O-270U integrates SeaLATCH USB ports, which are fully compatible with standard USB cables.
When used with the included USB cable with a SeaLATCH type B USB connector, the metal thumbscrew
provides a secure metal-to-metal connection to the hub and prevents accidental cable disconnection.
Additionally, a highly-retentive type B USB connector helps prevent unintentional separation from a
standard USB cable. The SeaLATCH type B locking connector and high retention type B port are shown
below.
The hub’s seven SeaLATCH type A locking USB connectors can secure USB peripherals to the hub in the
same way. Two of the SeaLATCH type A USB ports are shown below. Each of the seven downstream
type A USB ports provides a full 500mA to USB peripherals.

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© Sealevel Systems, Inc. 270U Manual | SL9179 12/2022
Status LEDs
Status LEDs are also included on the front of the SeaI/O-270U module to indicate the following
information:
•ENABLE (Yellow) – Lights when the USB hub is enumerated by the host system.
•FAULT (Red) – Lights when there is a problem with a downstream USB port. Disconnect the
downstream devices one at a time until the status returns to normal.
•EXT POWER (Green) – Indicates the external power supply is properly connected to the hub and
an AC power source.
External Power
The SeaI/O-270U includes an industrial grade wall-mount power supply (Item# TR123) that outputs 12VDC
@ 2.5A. Power is input via a 5mm 2-position removable screw terminal block (shown below). To prevent
accidental disruption of power, the terminal block includes mounting screws for securing to the hub.

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© Sealevel Systems, Inc. 270U Manual | SL9179 12/2022
SeaLATCH® USB
The SeaI/O-270 integrates SeaLATCH USB ports, which are fully compatible with standard USB cables.
When used with the included USB cable (Item# CA356) with a SeaLATCH USB Type B connector, the metal
thumbscrew provides a secure metal-to-metal connection to the hub and prevents accidental cable
disconnection.
The hub’s seven SeaLATCH Type A USB connectors can secure USB peripherals to the hub in the same
way. Sealevel incorporates SeaLATCH locking USB ports on many USB I/O devices. Accidental cable
disconnection is the most common point of failure with USB industrial I/O devices and SeaLATCH cables
and connectors prevents that while being fully compatible with standard USB cables.
Examples of the SeaI/O-270U with SeaLATCH equipped Sealevel I/O devices are shown below.