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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© Sealevel Systems, Inc. 2107 Manual | SL9218 8/2022
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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© Sealevel Systems, Inc. 2107 Manual | SL9218 8/2022
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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© Sealevel Systems, Inc. 2107 Manual | SL9218 8/2022
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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© Sealevel Systems, Inc. 2107 Manual | SL9218 8/2022
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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© Sealevel Systems, Inc. 2107 Manual | SL9218 8/2022
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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© Sealevel Systems, Inc. 2107 Manual | SL9218 8/2022
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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© Sealevel Systems, Inc. 2107 Manual | SL9218 8/2022
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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© Sealevel Systems, Inc. 2107 Manual | SL9218 8/2022
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