SeaLevel SeaLINK+485-DB9 User manual

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© Sealevel Systems, Inc. 2107 Manual | SL9218 8/2022
SeaLINK+485-DB9
User Manual | 2107

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© Sealevel Systems, Inc. 2107 Manual | SL9218 8/2022
Contents
CONTENTS............................................................................................................................................................................................................................2
BEFORE YOU GET STARTED..............................................................................................................................................................................................3
INTRODUCTION...................................................................................................................................................................................................................4
ELECTRICAL SPECIFICATIONS .......................................................................................................................................................................................10
TECHNICAL SPECIFICATIONS..........................................................................................................................................................................................11
HARDWARE CONFIGURATION .......................................................................................................................................................................................12
INSTALLATION & CONFIGURATION..............................................................................................................................................................................13
HARDWARE INSTALLATION............................................................................................................................................................................................15
APPENDIX A - HANDLING INSTRUCTIONS..................................................................................................................................................................21
APPENDIX B – TROUBLESHOOTING.............................................................................................................................................................................22
APPENDIX C – ELECTRICAL INTERFACE......................................................................................................................................................................23
APPENDIX D – ASYNCHRONOUS COMMUNICATIONS.............................................................................................................................................24
APPENDIX E – CABLE DRAWING...................................................................................................................................................................................25
APPENDIX F – HOW TO GET ASSISTANCE ..................................................................................................................................................................26
WARRANTY ........................................................................................................................................................................................................................27

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Before You Get Started
What’s Included
The SeaLINK+485-DB9 (2107) is shipped with the following items. If any of these items is missing or
damaged, please contact Sealevel for replacement.
•Item# 2107 – USB to RS-485 Single Port Serial Interface Adapter
•Item# TB34 – DB9 Female to 5 Screw Terminals
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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Introduction
Overview
The Sealevel Systems SeaLINK+485-DB9 serial interface adapter provides the PC with a single USB to RS-
485 asynchronous serial port providing a versatile interface for common RS-485 needs. The SeaLINK+485
connects to a PC’s external USB port, so it does not require opening the computer case. Resources such
as IRQs and I/O addresses are also not utilized.
The SeaLINK® USB to RS-485 serial adapter utilizes Sealevel’s expertise in military-grade designs by
incorporating a ruggedized, overmolded enclosure design. This improves the reliability and durability in
industrial and mobile applications such as GPS navigation systems, barcode readers, signature input
devices, serial printers, scales, and similar applications.
The 2107 features programmable baud rate and data formats with 128-byte receive and 256-byte transmit
buffers. The USB serial adapter is compatible with all standard PC baud rates (300 baud and above) and
supports high-speed communication to 921.6K bps. The 2107 is powered by the USB port and status LEDs
molded into the enclosure indicate serial data activity and connection to the host.
The 2107 is specifically designed to be placed on either end of a two-wire half-duplex RS-485
communication link. It provides built in pull-up, pull-down, and terminating resistors that are required for
devices at the end of the link. It provides the required pull-up, pull-down, and terminating resistors required
for devices at the end of the link. Because the 2107 is designed to fully implement a two-wire half-duplex
RS-485 end point, it should not be placed in the middle of a RS-485 link. Because the 2107 is designed to
fully implement a RS-485 end point, it should not be placed in the middle of a RS-485 link.
Sealevel SeaCOM USB software drivers and utilities make installation and operation easy using Windows
and Linux operating systems. After installing the software, simply plug the 2107 into an available USB port
and the serial port is recognized as a standard COM port by the host system enabling compatibility with
legacy software.
The attached cable is 44 inches long and fully shielded to protect the 2107 from RF and EMI interference
that is common in mobile and industrial environments. Standard operating temperature range is -40° -
+75°C.

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Features
•Compliant with RoHS and WEEE directives
•High-speed UART with 128-byte Rx FIFO and 256-
byte Tx FIFO
•Data rates from 300 bps to 921.6K bps
•Two-wire half duplex operation with built-in end of
link pull-up, pull-down, and terminating resistors
•Powered by USB connection
•DB9M connector
Optional Items
Depending upon your application, you are likely to find one
or more of the following items useful with the 2107. All items can be purchased from our website
(www.sealevel.com)by calling our sales team at [phone].
Cables
Terminal Block - DB9 Female to 5 Screw Terminals (RS-422/485) (Part# TB34)
The TB34 terminal block adapter offers a simple solution for
connecting RS-422 and RS-485 field wiring to a serial port. The
terminal block is compatible with 2-wire and 4-wire RS-485
networks and matches the RS-422/485 pin-out on Sealevel
serial devices with DB9 male connectors. A pair of
thumbscrews secures the adapter to the serial port and
prevents accidental disconnection. The TB34 is compact and
allows multiple adapters to be used on multi-port serial
devices, such as Sealevel USB serial adapters, Ethernet serial
servers and other Sealevel serial devices with two or more
ports.
DB9F to DB25M (RS-485) Extension Cable (Part# CA177)
The CA177 is a standard AT-style RS-485 modem cable with a
DB9F connector on one end and a DB25M connector on the
other. This cable is 72 inches in length.

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DB9F to DB9M Extension Cable (Part# CA127)
The CA127 allows users to extend a DB9 cable up to six feet.
The connectors are pinned one-to-one,
so the cable is
compatible with any device or cable that has DB9 connectors.
DB9 Female to 9 Screw Terminal (Part# TB05)
The TB05 terminal block breaks out a DB9 connector to 9 screw
terminals to simplify field wiring of serial connections. It is ideal
for RS-422 and RS-485 networks, yet it will work with any DB9
serial connection, including RS-232. The TB05 includes holes
for board or panel mounting. The TB05 is designed to connect
directly to Sealevel DB9 serial cards or any cable with a DB9M
connector.
Hubs
High Speed 4-Port USB 2.0 Hub with SeaLATCH USB Ports (Part# HUB4P)
The hub is USB 2.0 compliant, providing a full 480M bps data
rate to the host, and is backwards compatible with USB 1.1 and
1.0 devices. The HUB4P includes a wall-mount AC adapter that
supplies a full 500mA to each attached USB peripheral. The
power supply outputs 5VDC @ 2.4A and has a locking DC
connector to prevent accidental removal of the power cable.
High Speed 7-Port USB 2.0 Hub (Part# Hub 7P)
The HUB7P is USB 2.0 compliant, providing a full 480M bps data
rate to the host, and is backwards compatible with USB 1.1 and
1.0 devices. The powered hub includes a wall-
mount AC
adapter that supplies a full 500mA to each attached USB
peripheral. The power supply outputs 5VDC @ 4A and has a
locking DC connector to prevent accidental removal of the
power cable. The hub is housed in a rugged plastic enclosure
and status LEDs indicate external power, connection to the
host, and fault conditions.
Adapters and Converters
DB9F to RJ45 Modular Adapter (Item# RJ9S8)
The RJ9S8 is a DB9 female to RJ45 adapter. It can be
configured without tools and is an excellent choice for using
available infrastructure wiring.

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DB9 Female to DB9 Male - Serial Surge Suppressor (Part# SS-DB9)
User configurable for use with male or female DB9 ports, the
SS-DB9 protects all 9 lines, plus D shell chassis. Convenient
DB9 input and output connects directly to the protected port,
obtaining a ground outlet from the computer chassis. Surge
suppression is handled with balanced arrays of high-speed
avalanche diodes that divert excess energies created by
electrostatic discharges, faulty wiring, or lightning away from
network interface connections.
Product Family
Whether you require one serial port or 16, SeaLINK USB serial adapters will have you quickly communicating
with RS-232, RS-422, and RS-485 peripherals. Unlike traditional UART-based devices, SeaLINK USB
products use a state-machine architecture that reduces host processor overhead for faster, more reliable
communications. Sealevel's SeaCOM software drivers and utilities make installation and operation easy
using Windows and Linux operating systems.
Part # Description
2105R USB to 1-Port RS-232 DB9 Serial Interface Adapter
2106 USB to 1-Port RS-422 DB9 Serial Interface Adapter
2107 USB to 1-Port RS-485 DB9 Serial Interface Adapter
2113 USB to 1-Port RS-232, RS-422, RS-485 DB9 Serial Interface Adapter
2123 USB to 1-Port RS-232, RS-422, RS-485 (Software Configurable) DB9 Serial Interface Adapter
2101 USB to 1-Port RS-232 DB25 Serial Interface Adapter
2102 USB to 1-Port RS 422, RS-485, RS-530 DB25 Serial Interface Adapter
2103 USB to 1-Port Isolated RS-232 DB25 Serial Interface Adapter
2104 USB to 1-Port RS 422, RS-485, RS-530 DB25 Serial Interface Adapter
2108 Embedded USB to 1-Port RS-232 DB9 Serial Interface Adapter with Low Profile PC Bracket
2128 Embedded USB to 1-Port RS-232, RS-422, RS-485 (Software Configurable) DB9 Serial
Interface Adapter with PC Bracket
2213 USB to 2-Port Isolated RS-232, RS-422, RS-485 DB9 Serial Interface Adapter
2223 USB to 2-Port RS-232, RS-422, RS-485 (Software Configurable) DB9 Serial Interface Adapter
2201 USB to 2-Port RS-232 DB9 Serial Interface Adapter
2202 USB to 2-Port RS-422, RS-485 DB9 Serial Interface Adapter
2203 USB to 2-Port RS-232, RS-422, RS-485 DB9 Serial Interface Adapter

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2208 Embedded USB to 2-Port RS-232 DB9 Serial Interface Adapter with Standard Size PC
Bracket
2228 Embedded USB to 2-Port RS-232, RS-422, RS-485 (Software Configurable) DB9 Serial
Interface Adapter with PC Bracket
2401 USB to 4-Port RS-232 DB9 Serial Interface Adapter
2402 USB to 4-Port RS-422, RS-485 DB9 Serial Interface Adapter
2403 USB to 4-Port RS-232, RS-422, RS-485 DB9 Serial Interface Adapter
2404 USB to 4-Port RS-232 RJ45 Serial Interface Adapter
2407 USB to 4-Port RS-232, RS-485 RJ45 VersaCom Serial Interface Adapter
2423 USB to 4-Port RS-232, RS-422, RS-485 (Software Configurable) DB9 Serial Interface Adapter
2433 USB to 4-Port RS-232, RS-422, RS-485 (Software Configurable) DB9 Serial Interface Adapter
641U USB to RS-232 RJ45 Serial Interface Adapter
647U USB to RS-232, RS-485 RJ45 VersaCom Serial Interface Adapter
2801 USB to 8-Port RS-232 DB9 Serial Interface Adapter
2802 USB to 8-Port RS-422, RS-485 DB9 Serial Interface Adapter
2803 USB to 8-Port RS-232, RS-422, RS-485 DB9 Serial Interface Adapter
2804 USB to 8-Port RS-232 RJ45 Serial Interface Adapter
2807 USB to 8-Port RS-232, RS-485, RJ45 VersaCom Serial Interface Adapter
2823 USB to 8-Port RS-232, RS-422, RS-485 (Software Configurable) DB9 Serial Interface Adapter
2833 USB to 8-Port RS-232, RS-422, RS-485 DB9 Serial Interface Adapter
681U USB to RS-232 RJ45 Serial Interface Adapter
687U USB to RS-232, RS-485 RJ45 VersaCom Serial Interface Adapter
2161 USB to 16-Port RS-232 RJ45 Serial Interface Adapter
2167 USB to 16-Port RS-232, RS-485 RJ45 VersaCom Serial Interface Adapter
2108S Embedded USB to 1-Port RS-232 DB9 Serial Interface Adapter with Standard Size PC
Bracket
2123-OEM USB to 1-Port RS-232, RS-422, RS-485 (Software Configurable) DB9 Serial Interface Adapter
2223-KT USB to 2-Port RS-232, RS-422, RS-485 (Software Configurable) DB9 Serial Interface Adapter
2223-OEM USB to 2-Port RS-232, RS-422, RS-485 (Software Configurable) DB9 Serial Interface Adapter
641U-OEM USB to RS-232 RJ4 Serial Interface Adapter

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647U-OEM USB to RS-232, RS-485 RJ45 VersaCom Serial Interface Adapter
681U-OEM USB to RS-232 RJ45 Serial Interface Adapter
687U-OEM USB to RS-232, RS-485 RJ45 VersaCom Serial Interface Adapter
2106-RoHS RoHS Compliant USB to 1-Port RS-422 DB9 Serial Interface Adapter
2102-RoHS RoHS Compliant USB to 1-Port RS-422, RS-485, RS-530 DB25 Serial Interface Adapter
2201-RoHS RoHS Compliant USB to 2-Port RS-232 DB9 Serial Interface Adapter
2203-RoHS RoHS Compliant USB to 2-Port RS-232, RS-422, RS-485 DB9 Serial Interface Adapter
2401-RoHS RoHS Compliant USB to 4-Port RS-232 DB9 Serial Interface Adapter
2403-RoHS RoHS Compliant USB to 4-Port RS-232, RS-422, RS-485 DB9 Serial Interface Adapter
2801-RoHS RoHS Compliant USB to 8-Port RS-232 DB9 Serial Interface Adapter
2404-RoHS RoHS Compliant USB to RS-232 RJ45 Serial Interface Adapter for Powering 5VDC Serial
Peripherals
2402-DC12 RoHS Compliant USB to RS-232 RJ45 Serial Interface Adapter for Powering 12VDC Serial
Peripherals
2404-DC24 USB to RS-232 RJ45 Serial Interface Adapter for Powering 24VDC Serial Peripherals
2407-DC05 USB to 4-Port RS-232, RS-485 RJ45 VersaCom Serial Interface Adapter for Powering 5VDC
Serial Peripherals
2407-DC12 USB to 4-Port RS-232, RS-485 RJ45 VersaCom Serial Interface Adapter for Powering 12VDC
Serial Peripherals
2407-DC24 USB to 4-Port RS-232, RS-485 RJ45 VersaCom Serial Interface Adapter for Powering 24VDC
Serial Peripherals
2804-DC05 USB to 8-Port RS-232 RJ45 Serial Interface Adapter for Powering 5VDC Serial Peripherals
2804-DC12 USB to 8-Port RS-232 RJ45 Serial Interface Adapter for Powering 12VDC Serial Peripherals
2804-DC24 USB to 8-Port RS-232 RJ45 Serial Interface Adapter for Powering 24VDC Serial Peripherals
2807-DC05 USB to 8-Port RS-232, RS-485 RJ45 VersaCom Serial Interface Adapter for Powering 5VDC
Serial Peripherals
2807-DC12 USB to 8-Port RS-232, RS-485 RJ45 VersaCom Serial Interface Adapter for Powering 12VDC
Serial Peripherals
2807-DC24 USB to 8-Port RS-232, RS-485 RJ45 VersaCom Serial Interface Adapter for Powering 24VDC
Serial Peripherals

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Electrical Specifications
The SeaLINK+485-DB9 utilizes a USB UART. This chip features programmable baud rate, data format, 128-
byte RX buffer, and 256-byte TX buffer. The RS-485 two-wire transceiver supports data rates from 300 baud
up to 921.6K baud. Refer to Appendix C for cable length limitations.
Connector Pin Out
RS-485 (DB-9 Male)
Note that pins 1 and 4 are internally connected and either may be used for the (+) wire in a two-wire
half duplex RS-485 link. Pins 2 and 3 are internally connected and either may be used for the (-) wire.
Note that pins 1 and 4 are internally pulled up to +5 volts though a 510-ohm resistor. Pins 2 and 3
are internally pulled down to ground through a 510-ohm resistor. The (+) and (-) pins are connected
together with a 120-ohm terminating resistor. This device should only be used at either end of a
RS-485 link.
Pin # Signal Name Mode
1 DATA+ Data Positive I/O
2 DATA- Data Negative I/O
3 DATA- Data Negative I/O
4 DATA+ Data Positive I/O
5 GND Ground
6 N/C Not Connected N/A
7 N/C Not Connected N/A
8 N/C Not Connected N/A
9 N/C Not Connected N/A

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Technical Specifications
Environmental Specifications
Specification Operating Storage
Temperature Range -40º to 75º C (-40º to 185º F) -50º to 105º C (-58º to 221º F)
Humidity Range 10 to 90% R.H. Non-Condensing 10 to 90% R.H. Non-Condensing
Power Consumption
Supply line +5 VDC
Rating 100 mA
(Maximum) via locking 2.1mm Barrel plug
Manufacturing
All Sealevel Systems Printed Circuit boards are built to UL 94V0 rating and are 100% electrically tested.
These printed circuit boards are solder mask over bare copper or solder mask over tin nickel.

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Hardware Configuration
Ruggedized Overmold Enclosure
The 2107 is built for harsh conditions and features a military-grade, ruggedized, overmolded enclosure.
This improves the reliability and durability in industrial and mobile applications.
DB9M Serial Connector
The 2107 includes a DB9 male serial connector on one end of the device. The pin assignments for this
connector are detailed in the previous Electrical Specifications section.
Status LEDs
A pair of status LEDs indicate:
•Tx (Red) – Light when data is being transmitted
•Rx (Green) – Light when data is being received
Attached USB Cable
The attached cable has a black jacket over a braided shield. The cable is approximately 44” overall with a
USB Type A connector, which is compatible with any available USB port on a host computer or USB hub.
Self-powered hubs can be used as long as they provide a minimum of 100mA to each USB port. The 2107
is compatible with USB 2.0 ports and is USB 1.1 compliant.

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Installation & Configuration
Software Installation
Windows Installation
Do not install the Adapter in the machine until the software has been fully installed.
Only users running Windows 7 or newer should utilize these instructions for accessing and
installing the appropriate driver via Sealevel’s website. If you are utilizing an operating system
prior to Windows 7, please contact Sealevel by calling 864.843.4343 or emailing
[email protected] to receive access to the proper driver download and installation
instructions.
1. Begin by locating, selecting, and installing the correct software from the Sealevel software driver
database.
2. Select the Part Number (2107) for your device from the listing.
3. Click the ‘Install Drivers’ button.
4. The setup file will automatically detect the operating environment and install the proper
components.
To confirm that the SeaCOM driver has been successfully installed, click on the ‘Start’ button, and then
select ‘All Programs’. You should see the ‘SeaCOM’ program folder listed.
You are now ready to proceed with connecting the 2107 to your system. Refer to the Hardware
Installation section for details.
Windows NT is not USB aware and thus cannot support this device.

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Upgrading to the current SeaCOM driver
1. Download the current driver using the Instructions from the ‘Software Installation’ section
above. Please take note of the destination directory it will save to.
2. Uninstall the currently loaded driver SeaCOM driver found in the Control Panel. Prior to
Windows Vista SeaCOM will be populated in ‘Add/Remove Programs’ list. In Vista and
newer OSs it will be found in the ‘Programs and Features’ list.
3. Navigate to the Device Manager and remove the Sealevel adapter by right clicking on the
line item choosing ‘Uninstall’. Depending on your product, it can be found under either
‘Multiport Serial adapters’ or ‘Universal Serial Bus controllers’.
4. Single port ISA cards and PCMCIA cards will need to be uninstalled under ‘Ports (COM &
LPT)’.
5. In the Device Manager under ‘Action’, choose ‘Scan for Hardware changes’. This will
prompt the installation of the adapter and associate it with the newly installed SeaCOM
driver.
6. Proceed with the hardware installation of your SeaLINK USB serial adapter.

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Hardware Installation
The SeaLINK+485 can be connected to any Upstream Type A USB port at the PC host or an Upstream Hub.
Since it is hot pluggable, there is no need to power down your computer prior to installation. The
SeaLINK+485 requires no user hardware configuration. Once you have installed the software simply plug
the USB connector into an available USB port. The drivers that were installed during setup will automatically
be used to configure the adapter. In Windows XP and previous OS versions, you should see one or more
‘Found New Hardware’ windows, indicating the actual device being created and enumerated. See below. In
Vista and newer operating systems, the enumeration occurs automatically without user interaction.
Once the device has been connected, the Found New Hardware wizard will appear twice – first for
the USB part, and then for the serial port that you are installing.
The following instructions are applicable to the Windows XP operating system and may vary depending
on your version of Windows.
1. After the software installation is complete, plug the 2107 into an available USB port on
the computer or USB hub.
2. A ‘Found New Hardware’ alert will appear above the system tray.
3. The ‘Found New Hardware Wizard’ will appear.

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4. Choose ‘No, not this time’ and click ‘Next’ to proceed.
5. Choose ‘Install the software automatically’ and click ‘Next’.

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6. The ‘Hardware Wizard’ will search for the proper drivers; however, it may be interrupted
by a message stating that the hardware has not passed Windows certification. Click
‘Continue Anyway’.
All SeaCOM software and drivers have been fully tested by Sealevel. Clicking ‘Continue anyway’ will
not harm your system.
7. The appropriate drivers for your SeaLINK device and version of Windows will be installed
as shown.

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8. Click ‘Finish’ to complete the installation of your hardware.
The ‘Found New Hardware Wizard’ appears a second time; repeat steps 4-8.
9. When the ‘Found New Hardware’ alert informs you that your hardware is installed and
ready to use, you can proceed with verifying the installation to check functionality and/or
locate the COM port assignments, if necessary.

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Verifying Installation
To confirm that the serial port has been successfully installed, look in Device Manager under ‘Ports (COM
&LPT)’ and the COM assignment will be included with the associated COM number in parentheses.
To access Device Manager, follow the steps below:
1. Right click on ‘My Computer’ icon on your desktop or in the Start menu.
2. Click ‘Manage’ in the fly out menu to launch the ‘Computer Management’ console window.
3. In the left pane under ‘System Tools’, click ‘Device Manager’.
4. In right pane near the bottom, expand the ‘Ports (COM & LPT)’ section by clicking the ‘+’
symbol.
5. You should now see the COM assignment with the associated COM number in
parentheses.
Your system will assign the next available COM number, which will vary by computer (COM4 as
shown in this example).

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Remove Software Using Control Panel
Make sure you have first removed the hardware using the instructions on the previous page before
removing the software, otherwise remnants of the configuration settings will be left on your system.
Keep the SeaLINK device plugged in until the software has been completely uninstalled.
1. Access the Control Panel by clicking the ‘Start’ button, and then ‘Control Panel’.
2. In the Control Panel window, double-click the ‘Add or Remove Programs’ icon (In Windows
Vista, double-click on ‘Programs and Features’).
3. The Add or Remove Programs window will list all currently installed software on your
system. Once the ‘Currently installed programs’ list populates, locate, and select the entry
for ‘SeaCOM’.
4. Click the ‘Remove’ button.
5. The ‘SeaCOM – InstallShield Wizard’ window will appear along with a dialog box asking
you to confirm. Click the ‘Yes’ button to continue.
6. When the removal process completes, click the ‘Finish’ button to close the window. A
dialog box appears to confirm the removal success. Click the ‘Ok’ button on the dialog box.
7. If you are upgrading software, leave the SeaLINK device plugged in and follow the
instructions in the ‘UPGRADING TO THE CURRENT SEACOM DRIVER’ section above.