StarTechcom Switch NETRS2321E User Manual

1 Port RS-232/422/485 Serial over IP  
Ethernet Device Server  
NETRS2321E  
NETRS2321EEU  
NETRS2321EGB  
*actual product may vary from photos  
DE: Bedienungsanleitung - de.startech.com  
FR: Guide de l'utilisateur - fr.startech.com  
ES: Guía del usuario - es.startech.com  
IT: Guida per l'uso - it.startech.com  
NL: Gebruiksaanwijzing - nl.startech.com  
PT: Guia do usuário - pt.startech.com  
Manual Revision: 02/14/2012  
 
Table of Contents  
Introduction............................................................................................1  
Packaging Contents ................................................................................................................................. 1  
System Requirements.............................................................................................................................. 1  
Top View ....................................................................................................................................................... 2  
Left Side View ............................................................................................................................................. 2  
Right Side View .......................................................................................................................................... 2  
LED Indicators............................................................................................................................................. 3  
Wiring Architecture .................................................................................................................................. 3  
Installation ..............................................................................................4  
Device Management Utility .................................................................................................................. 4  
Web Console Configuration.................................................................................................................. 6  
Controller Update ..................................................................................................................................... 10  
Virtual COM Port........................................................................................................................................ 10  
Factory Default Setting........................................................................................................................... 13  
Self-Testing..............................................................................................14  
Hyper Terminal for TCP/IP WinSock .................................................................................................... 14  
Troubleshooting.....................................................................................15  
Specifications..........................................................................................16  
Technical Support ..................................................................................17  
Warranty Information............................................................................17  
Instruction Manual  
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Introduction  
The NETRS2321E 1 Port RS-232/422/485 Serial over IP Ethernet Device Server is the ideal  
solution for remotely controlling serial devices over your LAN/WAN or even the internet.  
Featuring user-friendly browser-based configuration of network settings, serial port line  
settings, UART transmit/receive buffer trigger levels and serial port flow control.  
The Ethernet to RS232 converter is designed to function seamlessly with your other  
integrated and add-on serial ports as if they were right inside your computer. The  
adapter also offers remote Telnet configuration and support for IP, HTTP, ICMP and TCP  
network protocols, while providing data transfer rates of up to 115.2Kbps per port.  
Backed by a StarTech.com 2-year warranty and free lifetime technical support.  
Packaging Contents  
1 x NETRS2321E / GB / EU adapter  
1 x Power Adapter  
1 x Instruction Manual  
1 x Driver CD  
System Requirements  
10/100 Mbps compatible TCP/IP Ethernet network  
Available power outlet at adapter location  
Virtual COM software: Microsoft® Windows® XP (32/64-bit)/Vista (32-bit)/7 (32-bit)  
Instruction Manual  
1
 
Top View  
Left Side View  
Right Side View  
*actual product may vary from photos  
Instruction Manual  
2
 
LED Indicators  
PWR (Green) - Power indicator  
Data (Red) - Data sent and received indicator  
10/100 (Green) - Network signal indicator.When illuminated, network connection is present.  
LED (Red) - Device status indicator. When operating under normal status, this LED  
will blink once per second.  
Wiring Architecture  
Instruction Manual  
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Installation  
Device Management Utility  
The Device Management Utility that is included with NETRS2321E (ETM.exe) is used to  
detect and setup the installed adapter. When this tool is installed and activated, it will  
detect the existence of the installed adapter, and depict its status including IP Address,  
Subnet Mask, MAC Address and Device ID as shown below. The Setup Tool can only  
configure one adapter at a time, therefore if there are multiple adapters installed on the  
network, please ensure that they are not connected (or shut down) prior to installation.  
Due to the nature of broadcast UDP packets, ETM has the following characteristics:  
Broadcast packets are not limited by subnet. Even if the IP Address of the converters  
and the computer running ETM do not belong to the same subnet, it will still  
function correctly.  
Broadcast packet signals cannot be passed through a router. ETM can only be used  
to monitor devices with ETM installed, in the same segment of the LAN.  
To begin using the Device Management Utility, copy the file titled ETM.exe from the  
Driver CD that accompanied your NETRS2321E purchase, to your desktop. The file can  
be located in the following path on the Driver CD:  
E:\ETM (E: represents the CD/DVD-ROM drive)  
Once the file has been copied to the desktop, connect NETRS2321E to your LAN, using  
the available LAN port. Connect the included power adapter (9V DC, 500mA) to the  
power port provided on NETRS2321E. Wait for a few moments for the device to be  
detected, and double click on the ETM.exe icon to launch the application:  
Instruction Manual  
4
 
To refresh the status of the adapter network connection, click ‘Refreshon the lower  
right corner. This shold be performed following any configuration changes.  
To configure the IP address assigned to NETRS2321E, left click on the available device,  
then a window would pop up. Assign an IP Address with with the same Subnet Mask  
of your computer, ensuring that the address that is assigned is not already in use on  
the network. When you press the OK button, the IP Address will be refreshed within 2-3  
seconds.  
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NOTE: Because the Device Management Utility uses broadcast UDP packets,  
configuration is only allowed when the device’s password is left empty.  
Web Console Configuration  
In addition to basic IP Address and subnet mask, specific device settings can be set  
using an Internet browser, such as Internet Explorer or Netscape etc.  
If the IP Address of the adapter is already known (default is 192.168.0.10), enter it into  
the browser address line to launch the Login Page.  
The Login Page  
Once the Login Page has been launched (as shown on page 6), the following will be displayed:  
System time elapsed  
The time elapsed since the adapter was connected to the LAN will be displayed here.  
Firmware version  
The installed firmware will be identified here by date code.  
Serial number  
The adapter serial number consists of five digits and a unique MAC address used by the  
network in hexadecimal format.  
Password (Setup login)  
This field allows you to enter the administration password for authentication. By  
default, the password is left empty. If you have changed the password to something  
other than the default, press and hold the Reset button (located next to the RJ45 port)  
for five seconds. The adapter will power cycle; once it has been re-detected on the  
network, the password will have been reset to default. Please note that if there are  
more than three consecutive incorrect password attempts, the login function will be  
disabled for 15 minutes. During this period, even if the correct password is supplied,  
the login will not proceed  
Instruction Manual  
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The Setup Page  
Once the correct password has been entered in the Setup Login password field, click  
on Login to enter the Setup Page, which offers advanced configurability. The elements  
that can be configured are as follows:  
IP Address  
Allows you to modify the assigned IP Address of the adapter. Do not enter a value that  
is already in use on the connected network. If DHCP client mode is enabled, and there  
is a DHCP server on the network, this field will automatically be assigned.  
Subnet Mask  
This field allows configuration of the subnet mask address, to which the adapter is connected.  
If your subnet mask is provided by an ISP or internal network administrator, please inquire as  
to what this setting is, and enter it into this field. If DHCP client mode is enabled, and there is a  
DHCP server on the network, this field will automatically be assigned.  
Gateway address  
This field contains the gateway or router IP address. If your gateway address is  
provided by an ISP or internal network administrator, please inquire as to what this  
setting is, and enter it into this field. If DHCP client mode is enabled, and there is a  
DHCP server on the network, this field will automatically be assigned.  
Instruction Manual  
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Network link speed  
This field indicates the Ethernet physical link speed. “Autoindicates that the speed has  
automatically been assigned by the NETRS2321E adapter. You can also specify 10Mbps  
or 100Mbps, depending on the speed of the hub to which the adapter is connected.  
DHCP client  
This field will indicate either enabled or disabled status. Enable DHCP if there is a DHCP  
server on your network, otherwise, leave this value as disabled.  
Socket Port of HTTP Setup  
The socket port used to conduct the browser setup. Normally, HTTP protocol uses TCP  
port 80 for communication. If the field is changed to 81, port 80 will be reserved as an  
Internet connection.  
To enter the browser setup page, “http://x.x.x.x:81should be entered for port 81, and  
“http://x.x.x.xfor socket port 80, where x.x.x.x is the NETRS2321E IP address.  
Socket port of serial I/O (RS-232/422/485):  
Port number: A socket port assigned to the serial port. This 16-bit number ranges  
from 1 to 65535. Because the numbers below 1000 are used for specific purposes  
(i.e. 80 is for the http protocol), it is advisable to select a number larger than 1000.  
Generally, the port number 4660 is used for serial communication. However, you  
should specify a different port number for each serial port.  
Socket type: TCP Server: TCP protocol, passive open, to be connected from TCP clients.  
TCP Client: TCP protocol, active open, connect to the TCP Server.  
UDP: UDP protocol, connectionless.  
Destination setting:  
Destination IP Address: The server IP Address and socket port would be connected  
in TCP client and UDP client mode for a certain server IP Address.  
Destination socket port: The server socket port would be connected in TCP Client  
and UDP Client mode for a certain serial port.  
Connection: The connection can be selected in two modes, Auto or Manual.  
Serial I/O setting: Baud rate, parity, data bits, stop bits  
Baud rate: 300 - 115200bps  
Parity: None, Even, Odd  
Data Bits: 7,8  
Stop Bit: 1 or 2  
Instruction Manual  
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Serial I/O Interface: RS-232: TxD, RxD for data stream, no flow control  
RS-232 (RTS/CTS): TxD, RxD for data stream, RTS/CTS for flow control  
RS-232 (RTS/CTS, DTR/DSR): TxD, RxD for data stream, RTS/CTS for flow control.  
DTR for socket status, DSR for socket open/close control  
RS-485 (Half duplex): Half duplex RS-485 interface  
RS-422 (Full duplex): Full duplex RS-422 interface  
Packet mode of serial input: Packet mode could be in enabled/disabled mode.  
If packet mode is enabled, the data input from UART will be deferred until the  
input buffer is full, or NETRS2321E detects a 10-character packet gap and no more  
characters have arrived. The block waiting time is extended, to avoid splitting the  
complete packet.  
Device ID: User assigned ID number for NETRS2321E. Available ID range includes 0-65535  
Report device ID when connected: In TCP mode, if this parameter is enabled, every  
time the socket is connected, NETRS2321E will immediately report its device ID in  
the following formats:  
Serial #1 - nnnnnA[LF][CR]  
Serial #2 - nnnnnB[LF][CR]  
Digital I/O - nnnnnC[LF][CR]  
The total length is 8 bytes, where “nnnnnis a 5-digit device ID, assigned by the user;  
[LF] is decimal 10; [CR] is decimal 13.  
Setup password:Administration password used to login to the Controller Setup  
page. It may be left as empty, or up to 15 characters long.  
Access password: During socket connection, the Access/Authentication password  
may be empty or up to entered as 15 characters long. If the Access password is left  
empty, authentication is disabled. Otherwise, the authentication will proceed as  
normal. If authentication fails, or no password is supplied within 10 seconds, the  
socket will be closed.  
Instruction Manual  
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Controller Update  
Once you have entered the necessary parameters, press the Update button.  
NETRS2321E will save all parameters in internal non-volatile memory and then reboot.  
It will take roughly 5 or 10 seconds to complete the whole process following which a  
new login page will be presented, indicating that the Controller has been updated and  
that NETRS2321E is restarting.  
You can re-login and check if all parameters have been correctly saved. Once you have  
confirmed accuracy, you can close the browser.  
NOTE: If the domain under which NETRS2321E is operating is different from that of the  
computer running the browser, the login page won’t appear unless the NETRS2321E  
Gateway Address has correctly been set.  
Virtual COM Port  
The virtual COM port software, VSerPortConsole, is used to map a NETRS2321E unit on  
the network, to a COM port on the local computer system. The computer will treat the  
COM port as a regular serial port that is directly on the computer system. To use the  
virtual COM port feature:  
1. Ensure that the NETRS2321E unit has already been configured properly, and is  
accessible on the network.  
2. Copy the virtual COM port software onto the computer’s hard drive from the CD, if  
not already and run the software. Make sure to only run the version appropriate for  
your operating system.  
NOTE: The latest version of the virtual COM port software can be downloaded from  
Instruction Manual  
10  
 
3. Right-click on the blank window and select the option to “Add Port.  
4. In theAdd Portwindow, simply click the OK button. You choose to manually select a  
COM port number or have Windows manage it. Further configuration will occur later.  
5. Windows may prompt you for permission to install of the virtual serial port drivers.  
6. A COM port entry should now appear in the VSerPortConsole window, and a COM  
Instruction Manual  
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port should also be visible in the Windows Device Manager.  
7. Right-click on the COM port in the virtual COM software and select “Add Net.  
Instruction Manual  
12  
 
8. The “Add Netwindow will allow you to configure the COM port to the settings used  
by the NETRS2321E unit you wish to associate with. Select the proper operating  
mode, network settings used to configure the NETRS2321E unit previously (see Web  
Console Configuration).  
Factory Default Setting  
If you forget the setup password, or have incorrect settings making the converter  
inoperable, reset the settings to factory default:  
You can remove power from NETRS2321E and use any point tip to push the Reset  
button (next to the RJ45 port) and hold it for 5 seconds. This will automatically turn  
NETRS2321E back on, and reset the password to default.  
Instruction Manual  
13  
 
Self-Testing  
Hyper Terminal for TCP/IP WinSock  
After completing the wiring and parameter settings, it is advisable to confirm that all  
settings are correct.  
To use a single computer to test if NETRS2321E is performing properly:  
1. Initiate a Hyper Terminal from the Start Menu in Windows. This can be done  
by clicking on the Start button, selecting All Programs, then Accessories,  
Communications and finally Hyper Terminal.  
2. Provide a terminal name and click on OK.  
3. At the “Connect toscreen that follows, select the TCP/IP(Winsock) option, and click  
OK. Enter the NETRS2321E IP Address in the Host Address Field, and the Socket port  
number set for Serial Port 1 in the Port number field (e.g. 4660). The Socket type of  
Serial Port 1 should be TCP Server:  
Instruction Manual  
14  
 
Once the necessary settings have been made, click on OK. The Hyper Terminal window  
will appear - if all settings are correct, the time clock at the lower left corner of the  
terminal window will indicate “connectedand the hh:mm:ss timer will begin counting.  
Hyper Terminal for COM Port  
Initiate another Hyper Terminal connection as a COM Port Terminal. To do so, follow  
the previously listed steps (see HyperTerminal for TCP Winsock), used to create a Hyper  
Terminal for TCP/IP WinSock, but instead of selecting TCP/IP (Winsock), select COM  
1 (or another COM Port). Set the COM port Properties such that they are identical to  
those set for the Serial port.  
Data Transmission  
Once the Hyper Terminals have been setup for both COM Port and TCP/IP Winsock,  
type any characters in the COM Port Terminal and verify that the typed characters are  
also displayed in the TCP/IP Winsock terminal. Alternatively, check if the characters  
typed in the TCP/IP WinSock Terminal are also displayed in the COM Port Terminal. If  
yes, then all settings are correct, and the converter can operate properly.  
Troubleshooting  
IftheDeviceManagementUtility(ETM.exe)doesn’tdetecttheconverteronthenetwork:  
Please verify:  
The power is properly connected to NETRS2321E  
The network cable is properly connected between NETRS2321E and the hub  
There is no firewall interference. If the computer you are using is Windows XP,  
the Windows Firewall function may be enabled, which will block the Device  
Management Utility from detecting the NETRS2321E IP Address. Therefore, you  
may temporarily disable the Windows Firewall function, and re-enable it once the  
necessary parameters have been configured.  
If you cannot setup the NETRS2321E using Internet Explorer:  
Please verify that the network domain of the PC is the same as the converter.  
Instruction Manual  
15  
 
Specifications  
1 x DB9 male  
1 x 4-wire Terminal Block  
1 x RJ45 Ethernet female  
1 x DC Power  
Connectors  
LEDs  
Power, Data, LAN Link, System  
RS232/422/485  
Supported Serial Protocol  
Ethernet Link Speed  
Maximum Data Transfer Rate  
Power Adapter  
10/100 Mbps  
115.2 Kbps  
9VDC, 500mA, type M plug  
0°C ~ 60°C (32°F ~ 140°F)  
-10°C ~ 70°C (14°F ~ 158°F)  
0 ~ 80% RH  
Operating Temperature  
Storage Temperature  
Humidity  
Dimensions  
90.0mm x 90.0mm x 26.0mm  
105 g  
Weight  
Instruction Manual  
16  
 
Technical Support  
StarTech.com’s lifetime technical support is an integral part of our commitment to  
provide industry-leading solutions. If you ever need help with your product, visit  
documentation, and downloads.  
Warranty Information  
This product is backed by a two year warranty.  
In addition, StarTech.com warrants its products against defects in materials  
and workmanship for the periods noted, following the initial date of purchase.  
During this period, the products may be returned for repair, or replacement with  
equivalent products at our discretion. The warranty covers parts and labor costs only.  
StarTech.com does not warrant its products from defects or damages arising from  
misuse, abuse, alteration, or normal wear and tear.  
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.  
Instruction Manual  
17  
 
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Canada, the United Kingdom and Taiwan servicing a worldwide market.  
 

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