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USER MANUAL I23-SERIAL-ETHERNET StarTech.com
RS232 Serial Over IP Device Server

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Black rectangular electronic device labeled 'Surfacebox' with two green USB ports and a small green connector (no readable text or symbols beyond branding)123-SERIAL-ETHERNET shown
Actual product may vary from photos
User Manual
SKU#: I23-SERIAL-ETHERNET / I43-SERIAL-ETHERNET
For the latest information and specifications visit
www.StarTech.com/I23-SERIAL-ETHERNET / www.StarTech.com/I43-SERIAL-ETHERNET
Compliance Statements
FCC Compliance Statement
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:
• Reorient or relocate the receiving antenna
- Increase the separation between the equipment and receiver
- Connect the equipment into an outlet on a circuit different from that to which the receiver is connected
- Consult the dealer or an experienced radio/TV technician for help
Industry Canada Statement
This Class B digital apparatus complies with Canadian ICES-003.
Use of Trademarks, Registered Trademarks, and other Protected Names and Symbols
This manual may make reference to trademarks, registered trademarks, and other protected names and/or symbols of third-party companies not related in any way to StarTech.com. Where they occur these references are for illustrative purposes only and do not represent an endorsement of a product or service by StarTech.com, or an endorsement of the product(s) to which this manual applies by the third-party company in question. Regardless of any direct acknowledgement elsewhere in the body of this document, StarTech.com hereby acknowledges that all trademarks, registered trademarks, service marks, and other protected names and/or symbols contained in this manual and related documents are the property of their respective holders.
PHILLIPS® is a registered trademark of Phillips Screw Company in the United States or other countries.
To view manuals, videos, drivers, downloads, technical drawings, and more visit www.startech.com/support
Safety Statements
Safety Measures
- Wiring terminations should not be made with the product and/or electric lines under power.
- Cables (including power and charging cables) should be placed and routed to avoid creating electric, tripping or safety hazards.
Mesures de sécurité
To view manuals, videos, drivers, downloads, technical drawings, and more visit www.startech.com/support
Table of Contents
Compliance Statements....1
Safety Statements....2
Product Diagram (I23-SERIAL-ETHERNET) ....4
Front View 4
Rear View....5
Product Diagram (I43-SERIAL-ETHERNET) 6
Front View 6
Rear View....7
Product Information 8
Package Contents 8
Installation 8
Default Settings....8
Hardware Installation 9
Software Installation....11
Operation 11
Telnet....11
Use the Software to Discover the Serial Device Server 12
Configure the Serial Port Settings....14
Changing COM Port or Baud Rate in Windows 17
LED Chart 18
To view manuals, videos, drivers, downloads, technical drawings, and more visit www.startech.com/support
Product Diagram (I23-SERIAL-ETHERNET)
Front View

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1 2 3 4 3 2| Component Function | ||
| 1 | Status LED • Refer to LED Chart | |
| 2 | Wall Mounting Bracket Holes | • Used to secure the Serial Device Server to a Wall or Other Surface using appropriate Mounting Hardware |
| 3 | Serial Communication LED Indicators | • Refer to LED Chart |
| 4 | DB-9 Serial Ports | • Connect an RS-232 Serial Device |
| 5 | DIN Rail Mounting Holes (Not Shown) | • Four Holes on the bottom of the Serial Device Server• Used to secure the included DIN Rail Mounting Kit to the Serial Device Server |
To view manuals, videos, drivers, downloads, technical drawings, and more visit www.startech.com/support
Rear View

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Front view of a black wireless device with ports, connectors, and a green port (no visible text or symbols)| Component Function | ||
| 1 | Ethernet Port | Connect an Ethernet Cable to the Serial Device ServerSupports 10/100MbpsLink/Activity LEDs: Refer to LED Chart |
| 2 | DC 2-Wire Terminal Block Power Input | Connect a +5V~24V DC Power SourceA minimum of 5V 3A (15W) is required |
| 3 | DC Power Input | Connect the included Power Adapter |
To view manuals, videos, drivers, downloads, technical drawings, and more visit www.startech.com/support
Product Diagram (I43-SERIAL-ETHERNET)
Front View

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1 2 3 2| Component Function | ||
| 1 | Status LED • Refer to LED Chart | |
| 2 | Wall Mounting Bracket Holes | • Used to secure the Serial Device Server to a Wall or Other Surface using appropriate Mounting Hardware |
| 3 | DB-9 Serial Ports | • Connect an RS-232 Serial Device |
| 4 | Serial Communication LED Indicators (Not Labelled) | • Below each DB-9 Port• Refer to LED Chart |
| 5 | DIN Rail Mounting Holes (Not Shown) | • Four Holes on the bottom of the Serial Device Server• Used to secure the included DIN Rail Mounting Kit to the Serial Device Server |
To view manuals, videos, drivers, downloads, technical drawings, and more visit www.startech.com/support
Rear View

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Front view of a black wireless device with ports, connectors, and a green port (no visible text or symbols)| Component Function | ||
| 1 | Ethernet Port | Connect an Ethernet Cable to the Serial Device ServerSupports 10/100MbpsLink/Activity LEDs: Refer to LED Chart |
| 2 | DC 2-Wire Terminal Block Power Input | Connect a +5V~24V DC Power SourceA minimum of 5V 3A (15W) is required |
| 3 | DC Power Input | Connect the included Power Adapter |
| 4 | Factory Reset Button(Not Shown) | Resets the Serial Device Server to factory defaultsRefer to Factory Reset Procedure |
To view manuals, videos, drivers, downloads, technical drawings, and more visit www.startech.com/support
Product Information
Package Contents
- Serial Over IP Device Server x 1
- DIN Rail Kit x 1
- Din Rail Screws x 2
• Universal Power Adapter x 1 - Quick-Start Guide x 1
Installation
Default Settings
Out of the Box Settings
• IP Address: DHCP
- Password: admin
• Network Protocol Mode: Telnet Server (RFC2217)
- Serial Mode: RS-232
Factory Default Button Settings
• IP Address: 192.168.5.252
- Password: admin
• Network Protocol Mode: Telnet Server (RFC2217)
- Serial Mode: RS-232
To view manuals, videos, drivers, downloads, technical drawings, and more visit www.startech.com/support
Hardware Installation
(Optional) Configure DB-9 Pin 9 Power
By default, the Serial Device Server is configured with the Ring Indicator (RI) on Pin 9, but it can be changed to 5V DC. To change the DB9 Connector Pin 9 to 5V DC output, please follow these steps:
WARNING! Static Electricity can severely damage electronics. Ensure that you are adequately Grounded before you open the device housing or touch the change the jumper. You should wear an Anti-Static Strap or use an Anti-Static Mat when opening the housing or changing the jumper. If an Anti-Static Strap isn't available, discharge any built-up static electricity by touching a large Grounded Metal Surface for several seconds.
- Ensure the Power Adapter and all Peripheral Cables are disconnected from the Serial Device Server.
- Ensure the Terminal Block Connector has been removed from the Serial Device Server.
- Using a Phillips Screwdriver, remove the Screws from the Housing.
Note: Save these to re-assemble the housing after changing the jumper. - Using both hands, carefully open the Housing to expose the Circuit Board inside.
- Identify Jumper #4 (JP4), located inside the Housing next to the DB9 Connector.
- Using a pair of fine-point tweezers or a small flat-head screwdriver, carefully move the jumper to the 5V position.
- Re-assemble the Housing, ensuring the Housing Screw Holes align.
- Replace the Terminal Block Connector and Housing Screws removed in Step 2 and Step 3.
To view manuals, videos, drivers, downloads, technical drawings, and more visit www.startech.com/support
(Optional) Mounting The Serial Device Server With DIN Rail
- Align the DIN Rail Bracket with the DIN Rail Mounting Holes on the bottom of the Serial Device Server.
- Using the included DIN Rail Mounting Screws and a Phillips Head Screwdriver, secure the DIN Rail Kit to the Serial Device Server.
- Insert the DIN Rail Mounting Plate at an angle starting from the Top, then Push it against the DIN Rail.
(Optional) Mounting The Serial Device Server To A Wall Or Other Surface
- Secure the Serial Device Server to the desired Mounting Surface using the appropriate Mounting Hardware (i.e., wood screws) through the Wall Mounting Bracket Holes.
Install the Serial Device Server
- Connect the included Power Supply or a 5V\~24V DC Power Source to the Serial Device Server.
Note: The Serial Device Server can take up to 80 seconds to startup.
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Connect an Ethernet Cable from the RJ-45 Port of the Serial Device Server to a Network Router, Switch, or Hub.
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Connect an RS-232 Serial Device to the DB-9 Port on the Serial Device Server.
Software Installation
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Navigate to: www.StarTech.com/I23-SERIAL-ETHERNET or www.StarTech.com/I43-SERIAL-ETHERNET
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Click the Drivers/Downloads tab.
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Under Driver(s), download the Software Package for Windows Operating System.
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Extract the contents of the downloaded .zip file.
To view manuals, videos, drivers, downloads, technical drawings, and more visit www.startech.com/support
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Run the extracted executable file to start the software installation.
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Follow the on screen prompts to complete the installation.
Operation
Note: The devices support features which secure and protect the devices and its configuration using standard/best practices but as these are intended to be used in controlled environments using proprietary software (virtual COM port) and open communication standards (Telnet, RFC2217) which do not encrypt the data they should not be exposed to an unsecure connection.
Telnet
Using Telnet to send or receive data works with any operating system or host device that supports the Telnet protocol. The software for the connected serial peripheral device may require a COM Port or mapped hardware address. To configure this, the StarTech.com Device Server Manager is required, which is only supported on Windows operating systems.
To communicate with the connected Serial Peripheral Device via Telnet, perform the following:
- Open a terminal, command prompt, or third-party software that connects to a Telnet server.
- Type the IP Address of the Serial Device Server.
Note: This can be found using the StarTech.com Device Server Manager for Windows, or by viewing the connected devices on the local network router.
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Connect to the Serial Device Server.
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Type in the terminal, command prompt, or third-party software to send commands/data to the Serial Peripheral Device.
To view manuals, videos, drivers, downloads, technical drawings, and more visit www.startech.com/support
Use the Software to Discover the Serial Device Server
- Launch the StarTech.com Device Server Manager.

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Serial Device Server Administration v2.03 by Control Inc Add Search Refresh Search by IP (or the Internet) 220.108.47.168 Find Configure in App Configure in Browser Serial Portfolio Format COM_tsp: Host Mode Status Server IP/Port Host Name Server Settings Serial Mode Description Add Takedown Server Add All Servers Add Edit Delete Delete A6 Activity log Over log- Click Auto Search to initiate the process of discovering Serial Device Servers on the local network.
- Discovered Serial Device Servers will appear in the "Remote Server(s)" list in the right pane.

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Serial Devices Server Administrator (2.87) by Custom Inc. Auto Search Refresh Search by IP (or the Internet) 228.196.42168 Find Configure in App Configure in Service Serial Devices COM_No. Mat. Mode Status Server IP Port Host Name Serial Settings Serial Mode Description Add Selective Server Add All Servers Add Exit Delete Delete All Activity log: Clear logTo view manuals, videos, drivers, downloads, technical drawings, and more visit www.startech.com/support
- Select "Add Selected Server" to add a specific Serial Device Server or "Add All Servers" to add all discovered Serial Device Servers.

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Serial Device Server Administrator c203 by Cordos Inc Auto Search Refresh Search by IP (on the Internet) Z26.126.42.148 Find Configure in App Configure in Browser Remote Servers Found COM_No Reg. Mode Status Server IP Port Host Name Serial Settings Serial Mode Description COM# SP129PT Connected 152.168.0.152.5000 SDA.02be 521800N4.2.1 RS252 Serial Port 1 Add Selected Server Add All Servers Add Exit Delete Delete Add Activity log Clear log- The Serial Device Servers will be mounted in Device Manager as "SDS Virtual Serial Port" with an associated COM port number.

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X178-631: ICC Audio inputs and inputs Computer Disk drive Display adapters Home Interface Devices ICE (RIS/RTAM) controllers Bookboards Mouse and other pointing devices MicroBics Multi per Serial adapters Network adapters Portable Devices Ports (COM & IPT) Communications Port (COM1) Deluxe port (PCI - Serial Port (COM2)) Deluxe port (PCI - Serial Port (COM4)) GIS virtual Serial Port (COM4A) USB Serial Port (COM41) USB Serial Port (COM42) Print equations Processors Software devices Board, video and game controllers Storage controllers System devices The Board Serial for distributorsTo view manuals, videos, drivers, downloads, technical drawings, and more visit www.startech.com/support
Configure the Serial Port Settings
Available Serial Port Options
| Setting Available Options | |
| Baud Rate | 3006001200180024004800960014400192003840057600115200230400921600 |
| Data Bits | 78 |
| Parity | NoneEvenOddMarkSpace |
| Stop Bits | 12 |
| Flow Control | HardwareSoftwareNone |
To view manuals, videos, drivers, downloads, technical drawings, and more visit www.startech.com/support
In the Software
- Open the StarTech.com Device Server Manager.
- Select "Configure in App" or double click the Serial Device Server in the list.
- When the Settings Window opens, use the drop down menus to change Baud Rate, Data Bits, COM Port Number, and more.
Note: If changing the COM Port Number, see "Changing COM Port or Baud Rate in Windows" on Page 15.

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Edit Connection Parameters Basic Settings Advanced Settings Edit Advanced Settings COM No : COMNA Network Mode: TELNET Connection Type: Check COM Part Type: Altual Connection Name: Com_CEMN44 Remote Server IP: 102 163 203.6 Fut: 5000 Serial Port Settings Band Rate Data Bits Party 5600 8 None Stop Bits Flow Control 1 None Short Band Rate Emulsion ✓ Drusted ✓ Disabled Apply Changes Discard Changes Facket Connections Self-target Connections Short Linking Connections with pin Short Linking Connections with pin to: New Start Currents (Start Currents) or Start Currents New Start Currents (End Currents) or End Currents Connection Settings Connect to current and transition current from a short circuit Connect to short current connections with pin to: SMR connected to the start current in 10 ns Send Start Inventory 7 bits External Vary 1 bit Data Options External Start (Start) only Name Send Application (Start) only Status Step Increase Pin Drop Settings change if less New switch open button on the end with input line. Select Data Label Settings Take out 3 GB ✓ Open Access access ✓ Open the High access password and low access connection Show data options (if required not to switch existing, then) ✓ Open for CDS, Show for CDS, Show for OCC- Select "Apply Changes" to save the settings.
To view manuals, videos, drivers, downloads, technical drawings, and more visit www.startech.com/support
In the Web Interface
- Open a web browser.
- Type the IP address of the Serial Device Server into the address bar.
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Enter the password and select "Login". See Default Password on Page 6.
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Select the "Serial Settings" to expand the options.

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StarTech.com Settings System Management Change Password Restore Default Robotic Server Logos Settings HKEY MAP LICERIP ZMCP IP TARGET SUPPORT TOMATO TARGETS MAC TARGET PROMERO TARGET 010 0571 Taylor Enbridge 142 168.6 210.0 248,243,330.0 90 168.6 21 01:04:30 15:05:34 05:06:30 23:42:14 Prev New Deputation IP Port Access Path Apply New New Settings 01:04:30 Severgetics Save Changes- Use the drop down menus to change Baud Rate, Data Bits, COM Port Number, and more.

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StarTech.com Settings System Management Change Password Restore Default Robust Server Layout Settings Key Items Location SNPs IP Address Server Bits Gateway Address I/BE Address Formware Options RCS-1001 Diasys E:\DATA\- 707 364.8.252 294 264.265 A 100.000 A - 1 Private Equity: $1.50 /A 41.00/0.00/10 H Port Name Destination IP Port Socket Port Socket Name Socket Settings TOTAL No. Description Access T Stream Server SaaS WDS WDS.0.15 p.75 CDBE 2x Mail Port 1 Set Road Rate Data Bits Punty Stop Bits Flow Connector Other Options Set NDD B Mood 1 Mood 12 Save ChangesTo view manuals, videos, drivers, downloads, technical drawings, and more visit www.startech.com/support
- Under "Set", select "OK" to set the serial settings to the port.
- Select "Save Changes" to save the settings to the Serial Device Server.
Changing COM Port or Baud Rate in Windows
To change the COM Port number or Baud Rate in Windows, the device must be deleted and re-created in the StarTech.com Device Server Manager.
Note: This is not necessary when using macOS or Linux which use Telnet to communicate with the Serial Device Server and do not map the device to a COM port or hardware address.
- Open a web browser and navigate to the IP address of the Serial Device Server or click "Configure in Browser" in the StarTech.com Device Server Manager.
- Enter the Serial Device Server password.
- Under "COM No.", change it to the desired COM Port number or change the Baud Rate to match the Baud Rate of the connected Serial Peripheral Device.
Note: Ensure the COM port number you assign is not already in use by the system, otherwise it will cause a conflict.
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Click Save Changes.
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In the StarTech.com Device Server Manager, click the Serial Device Server which should still have the old COM Port number, then click Delete.
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Re-add the Serial Device Server using "Add Selected Server" to add a specific Serial Device Server or "Add All Servers" to add all discovered Serial Device Servers.
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The Serial Device Server should now be mapped to the new COM Port number.
To view manuals, videos, drivers, downloads, technical drawings, and more visit www.startech.com/support
LED Chart
| LED Name LED Function | ||
| 1 | Link/Activity LEDs (RJ-45) | Steady Green: Indicates Ethernet connection has established, but no data activityBlinking Green: Indicates data activityOff: Ethernet is not connected |
| 2 | Serial Port LEDs (DB-9) | Blinking Green: Indicates serial data is being transmitted and/or receivedRight LED: Transmit Data IndicatorLeft LED: Receive Data IndicatorOff: No serial data is being transmitted or received |
| 3 | Power/Status LED | Steady Green: Power is OnOff: Power is OffBlinking Green: Restoring to Factory Defaults |
To view manuals, videos, drivers, downloads, technical drawings, and more visit www.startech.com/support
Factory Reset Procedure
To initiate the factory reset procedure, press and hold the Factory Reset Button for at least 5 seconds. When the Status LED begins blinking, release the Factory Reset Button. The Status LED will then illuminate, indicating that the Serial Device Server is rebooting.

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V+.V S-24V DC STATUS Factory Reset Button PORT 4*143-SERIAL-ETHERNET shown
To view manuals, videos, drivers, downloads, technical drawings, and more visit www.startech.com/support
Warranty Information
This product is backed by a two-year warranty.
For further information on product warranty terms and conditions, please refer to www.startech.com/warranty.
Limitation of Liability
In no event shall the liability of StarTech.com Ltd. and StarTech.com USA LLP (or their officers, directors, employees or agents) for any damages (whether direct or indirect, special, punitive, incidental, consequential, or otherwise), loss of profits, loss of business, or any pecuniary loss, arising out of or related to the use of the product exceed the actual price paid for the product.
Some states do not allow the exclusion or limitation of incidental or consequential damages. If such laws apply, the limitations or exclusions contained in this statement may not apply to you.
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