Product ID: NETRS232
This 1-Port Serial Device Server lets you remotely access and manage an RS232 serial device over a local area network (LAN), for a simple and cost-effective serial-over-IP control solution.
For more control options, the device server is compatible with the free, StarTech.com NETRSAPP NETRSAPP. When coupled with the NETRS232, this handy application for iOS, Android, and Chrome Browser lets you build a custom serial control interface that’s tailored to your specific application.
For installation flexibility across a variety of environments, you can power the device server using the provided 12V DC power adapter, or using the integrated 10~30V DC terminal block.
Plus, the device server is DIN rail mountable for out-of-the-way installations.
To help ensure reliable performance and prevent possible damage, the serial device server offers 15KV ESD (Electrostatic Discharge) protection, so you can rest assured that the device server won’t become damaged due to externally generated ESD.
This highly-customizable device server is easy to configure to suit your application. For easy setup, Windows users can use the provided Virtual COM port software, or the versatile web-based interface.
The RS232 device server supports Telnet (an operating system independent communication protocol), so it can be integrated into mixed OS environments (Windows, Mac, Linux). Plus, it supports VCOM, TCP Server/Client, UDP, HTTP, DHCP, ICMP(PING), Static IP, and ARP protocols.
Download the StarTech.com serial control software from the Apple App Store, the Google Play™ Store, or the Chrome Web Store.
The NETRS232 is backed by a StarTech.com 2-year warranty and free lifetime technical support.
|Warranty Information||Warranty||2 Years|
|Connector(s)||1 - Connector Type(s)||DB-9 (9 pin, D-Sub)|
|Terminal Block (2 Wire)|
|Environmental||Operating Temperature||0°C to 60°C (32°F to 140°F)|
|Storage Temperature||-10°C to 70°C (14°F to 158°F)|
|Industry Standards||IEEE 802.3, IEEE 802.3u|
|Indicators||1 - LED Indicators||Power|
|Packaging Information||Package Height||3.0 in [76.0 mm]|
|Package Length||6.9 in [17.5 cm]|
|Shipping (Package) Weight||15.7 oz [444.0 g]|
|Package Width||6.3 in [15.9 cm]|
|Max Baud Rate||230.4 Kbps|
|Data Bits||5, 6, 7, 8|
|Flow Control||RTS/CTS, None|
|Parity||None, Even, Odd, Space, Mark|
|Stop Bits||1, 1.5, 2|
|Remote Management Ability||Yes|
|Surge Protection||15KV ESD (Electrostatic Discharge) Protection|
|Compatible Networks||10/100 Mbps|
|Supported Protocols||VCOM, TCP Server, TCP Client, UDP, HTTP, DHCP, ICMP(PING), Static IP, ARP, Telnet|
|Physical Characteristics||Weight of Product||2.4 oz [68.0 g]|
|Product Length||3.7 in [95.0 mm]|
|Product Width||2.2 in [55.0 mm]|
|Product Height||0.9 in [22.0 mm]|
|Power||Power Source||AC Adapter Included|
|Input Voltage||100 - 240 AC|
|Input Current||0.5 A|
|Output Voltage||12V DC|
|Output Current||1.2 A|
|Center Tip Polarity||Positive|
|Power Consumption (In Watts)||14.4|
|Software||OS Compatibility||Windows® 2000, XP, Vista, 7, 8, 8.1, 10
Windows Server® 2003, 2008 R2, 2012, 2012 R2, 2016, 2019
Linux: The included software does not support Linux to emulate a local COM port. Linux users would need to use Telnet.
|What's in the Box||1 - Included in Package||Serial over IP Device Server|
|DIN Rail Kit|
|Universal power adapter: comes ready for NA/EU/UK only when you buy in NA/EU/UK; comes ready for Australia and New Zealand only when you buy in Australia and New Zealand|
VCOM cannot be run as a service. A user must be logged in to launch the software.
VCOM is software provided to create a virtual serial port on your computer using the serial over IP. When you set it up properly, the network serial devices operate as though they are connected to a physical serial port.
Before you continue, make sure that your computer can communicate with the network serial device over your network. For more information, refer to the following FAQ: www.startech.com/faq/serial_ip_networking_issues.
Before you configure the VCOM software, make sure that you have downloaded and installed the latest software from the StarTech.com website. To download the driver, navigate to http://www.startech.com/Support and enter the part number.
When you have configured your setup so the network serial device can be pinged on the same subnet as the computer, click Search in VCOM to use the software to detect the network serial device. If the network serial device is on a different network than your computer, you can click Search by IP and enter a range of IP addresses to search by.
To configure each network serial device individually, select the device and click Configure.
You can use the VCOM software to do any of the following:
When you have correctly configured the network serial device for your network, you must map a COM port in VCOM to use the serial port on the network serial device. To map the COM port, complete the following:
The COM mapping should now appear in the list. For more information about how to verify the COM mapping in Windows, see the following FAQ: https://www.startech.com/support/faqs/technical-support?topic=serial#com-port-listing-windows.
In order for the serial device and your computer to communicate to each other, they both need to be on the same physical network and the same subnet.
To connect your serial device and your computer to the same physical network, plug both devices into the same router.
Typically, in order for devices to be on the same subnet, the first three numbers of the IP address must match. The fourth number of the IP address must be different, as two devices cannot have the same IP address. For example, if your computer’s IP address is 192.168.0.1, then the subnet is 192.168.0.XXX. You can replace the XXX with any number, as long as it is not currently in use by another device.
To check whether or not an RS-232 serial port is working, perform an RS-232 loopback test by doing the following:
Note: To open a telnet session on the COM port, you need a telnet client like PuTTY or Hyper Terminal. Windows XP comes with Hyper Terminal.
If the loopback test fails, make sure that the serial cable or gender changer that you are using works and that the adapter is in the correct port.
You can check multiple ports at the same time by opening multiple sessions, putting the loopback adapter on one port, and trying to type into each session. When you can see what you are typing, you know that the COM port is working and you can see which port number the physical serial port is. Close the window for the port that you just tested to speed up the testing of the remaining serial ports.
For products related to this article, click here.
This device's default static IP address is 192.168.1.1.
You should not upgrade your device's firmware if you do not have any issues with the functionality of your device. The only time you should consider an upgrade is if you are experiencing a problem with the device, and you have confirmed that the firmware addresses this problem. You can confirm this is the case by reviewing the documentation included with the firmware or by consulting with our Technical Support team. Incorrectly upgrading firmware can result in diminished performance so it is best to contact StarTech.com if you would like to perform this operation.
To troubleshoot this issue, you can try the following:
Before you begin, make sure that the serial device is on the same network and subnet. For more information, see this FAQ: http://www.startech.com/faq/serial_ip_networks_and_subnets. If the device starts with an IP address that is not on your subnet, change your IP address to match the subnet being used before you continue.
Ping the serial device
If the serial device and your computer are on the same network and subnet, try pinging the device.
To ping the device using a computer that is running a version of Windows XP, do the following:
To ping the device using a computer that is running a version of Windows Vista or Windows 7, do the following:
To ping the device using a computer that is running a version of Windows 8, do the following:
To ping the device using a computer that is running a version of Mac OS, do the following:
If you receive replies from the IP address, then you can see the device on the network and the issue is with something else.
Connect the serial device directly to the computer
To connect the serial device directly to the computer that you are troubleshooting with, complete the following:
Note: The second computer will need to be on the same network and subnet as the serial over IP device.
If you still cannot ping the device, contact support.
Make sure that you are working in a secure environment
If you still cannot connect to the device's web interface or by using the included software, contact support.
If you can access the web interface or connect using the included software, one at a time turn on your firewalls, antivirus programs, and security programs. Each time that you turn on software and cannot connect to the web interface or by using the included software, add an exception for the serial device to what you last re-enabled.
One of the most common applications of a network serial device is to use it to make a standard serial device accessible on a network. To do this, you need to connect a standard serial device to the DB-9 port on the network serial device. Next you need to connect the network serial device to a TCP/IP network using an Ethernet connection, and then install software on a client machine in order to access the network serial device. The software on the client machine communicates with the network serial device and creates (maps) a virtual COM port on your computer system. The virtual COM port is identical to a physical COM port and can be used in the same way.
You can use two network serial devices to extend a serial connection over a TCP/IP network. To do this, you need to configure one serial device as a client and the other as a server. The client and server are configured to transmit and receive data to their respective IP addresses and TCP ports. The serial settings must match for all connected serial devices, including the UART on both units. Depending on the serial device that you are using, you can use the provided software or the web interface to set the configurations.
You can use a network serial device to translate UDP data to a standard serial connection. The serial device is configured to listen for UDP traffic from specific IP addresses and ports, and will asynchronously transmit the data out of the serial port on the device. To do this, you need to configure UART on the network serial device to match the specifications of the serial receiver.
Check out our review guidelines.