
Serial-to-Ethernet Device Servers
Lantronix UDS2100 Two-Port Serial-to-Ethernet Device Server
A dual-port external device server that puts two RS232, RS422 or RS485 devices on a 10/100 Ethernet network, with virtual COM port control for Windows applications and paired serial tunneling.
From $269.58
Overview
About the Lantronix UDS2100
The UDS2100 (also written UDS 2100) network-enables two pieces of serial equipment from one small metal box, so you can manage or share devices such as instruments, terminals and controllers that were never designed for a network. Each port is independently software-selectable for RS232, RS422 or RS485, and data travels over a single 10/100 Ethernet connection.
Ports run from 300 baud to 921 Kbaud with hardware and software flow control, 2- and 4-wire RS485 support and 15 kV ESD protection. Lantronix specifies the connectors as two DB9M DTE ports. Serial tunneling works either through Com Port Redirector with TruPort technology, which lets Windows software read and set hardware pins and access serial buffers as if the ports were local, or by pairing two UDS2100 units over the network. RFC2217 is listed among supported protocols, and modem emulation mode replaces dial-up modems by accepting AT commands.
Configuration runs through DeviceInstaller, a web browser, Telnet, serial login or SNMP, and custom web pages can be stored in flash. Power is 9-30 VDC on a barrel connector at 1.8 W maximum. The IP30 metal enclosure has integrated wall mounts, accepts an optional 35 mm DIN rail kit and operates from 0°C to 60°C.
Key capabilities
- Two independent ports
- Each serial port is software-selectable for RS232, RS422 or RS485 (2- and 4-wire), so mixed devices can share one unit.
- Up to 921 Kbaud
- Serial rates from 300 baud to 921 Kbaud with CTS/RTS hardware and XON/XOFF software flow control. Each port is configured independently.
- TruPort COM control
- Com Port Redirector with TruPort lets Windows applications monitor and set serial hardware pins remotely, as with a local COM port.
- RFC2217 support
- RFC2217 is listed among supported protocols, alongside TCP, UDP, Telnet, DHCP, HTTP, SNMP and TFTP, for standards-based remote COM port access.
- Low 1.8 W draw
- 9-30 VDC barrel input with 600 W transient protection and 1500 VAC isolation on the Ethernet port.
How to choose the right UDS2100 part number
The two UDS2100 part numbers differ only in the AC power supply in the box. UD2100001-01 ships with a US domestic power supply; UD2100002-01 ships with an international supply and regional adapters, for sites outside North America. Optional accessories: ACDIN2001-01 DIN rail mount kit, ACC-500-164-R DB9F to DB9F null modem cable, ACC-500-163-R DB25M to DB9F serial cable, and ACC-520-0182-00 12 VDC 10 W wall-cube supply with four AC plugs.
Configure & order
Find your UDS2100 part number
Every orderable UDS2100 configuration, filtered by the specs that actually differ between them. Pick what you need on the left and the matching part numbers appear here.

UD2100001-01
$269.58
124 in stock

UD2100002-01
$269.58
42 in stock
Complete the deployment
Accessories, renewals & add-ons
Everything sold for the UDS2100, organized by what it does — power, cables & adapters, modules & option cards, other add-ons— each with why you'd add it.
Power
1 itemPower Supply
ACC-520-0182-00
External wall cube power supply with 12 V DC output and 10 W output power. It includes 4 AC plugs and is listed for compatible Lantronix device server products.
$60.70
14 in stock
Cables & adapters
1 item
cable
ACC-500-163-R
6 ft DB25M to DB9F serial cable for compatible Lantronix device server products.
$21.72
Ships on backorder
Modules & option cards
1 item
DB9F to DB9F Null modem cable
ACC-500-164-R
6 ft DB9F-to-DB9F null modem serial data transfer cable. It has one 9-pin DB-9 Serial - Female connector on each end.
$23.39
Ships on backorder
Other add-ons
1 item
Optional DIN-rail mount
ACDIN2001-01
Optional DIN-rail mount kit for compatible Lantronix device servers, including UDS200, SDS2100, and WiBox references in the part description.
$25.05
Ships on backorder
Compatibility taken from the Lantronix part-number tables for the UDS2100. Don't see what you need? Request a quote — we can source the full Lantronix catalog.
Where the UDS2100 is used
- Networking two serial instruments from one enclosure
- Remote access to serial consoles and terminals
- Virtual COM ports for legacy Windows control software
- Replacing dial-up modems on remote serial equipment
UDS2100 FAQ
How many serial devices can the UDS2100 connect?
Two. Each port is independently configurable as RS232, RS422 or RS485 (2- or 4-wire) and supports rates from 300 baud to 921 Kbaud. Both share a single 10/100 Ethernet connection.
What is the difference between UD2100001-01 and UD2100002-01?
Only the included power supply. UD2100001-01 includes a US domestic supply, and UD2100002-01 includes an international supply with regional adapters. The device server is the same.
Can Windows software use the UDS2100 as a COM port?
Yes. Com Port Redirector with TruPort technology maps the UDS2100 ports to virtual COM ports and gives applications control of hardware pins and serial buffers.
What is the UDS2100 operating temperature?
0°C to 60°C operating and -40°C to 85°C storage. For -40°C to 70°C operation with Modbus support, Lantronix offers the single-port UDS1100-IAP. The IP30 metal enclosure has integrated wall mounts.
What power does the UDS2100 need?
9-30 VDC on a barrel connector, with maximum consumption of 1.8 W. A wall-cube power supply is included with both part numbers. The power input has 600 W transient protection.



