Comnet CNFE3DOE2-M, CNFE3DOE2 User Manual
INSTALLATION AND OPERATION MANUAL
CNFE3DOE2/M
RS232/422/485 DATA OVER ETHERNET TERMINAL SERVER
The ComNet CNFE3DOE2/M allows any combination of two RS-232, RS-422, or 2 or
4-wire RS-485 serial data circuits to be inserted onto any 10/100 Mbps Ethernet-based
network. The CNFE3DOE2/M units include two serial data input/output ports, and
three Ethernet ports featuring two electrical ports and one SFP port. It may be used to
tunnel serial data over an IP network or as a media converter, for converting copper
transmission media to fiber. Access one serial device from the Internet and another
serial device from a local area network (LAN) using SSH or SSL. The CNFE3DOE2/M
provides control of the remote hardware, as if it were connected directly to the PC
COM port. A USB to serial converter may be required in new PCs without a DB9 serial
connection. The CNFE3DOE2/M supports SNMP Version 1, RFC1155, RFC1213 &
RFC1215.
INSTALLATION AND OPERATION MANUAL CNFE3DOE2/M
Contents
Hardware description 3
Assign IP Address to a Terminal Server 4
Using Terminal Server as a Serial Extender over Ethernet 8
TCP Transport 8
UDP Transport 13
SSL Transport 17
Creating openssl certificates 24
SSH Transport 26
Creating SSH key pairs 30
Telnet Transport 30
HTTPS Configuration 34
OpenSSL Certificate, key and CA for HTTPS 40
Console Port Access 41
Network Statistics 42
Factory Defaults 43
Upgrading Firmware 44
Module Update 44
TECH SUPPORT: 1.888.678.9427
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Hardware description
The ComNet CNFE3DOE2/M terminal server supports Ethernet transmission over two copper
ports and one fiber port. The server is universally compatible with RS232, RS422, RS485 serial
data protocols. All configurations are done through its web server. Distances depend on which
SFP (Small Form Pluggable) module is used. The RJ45 Ethernet and SFP interfaces are all enabled.
They can function as an Ethernet media converter.
Mechanical Drawing of CNFE3DOE2/M Unit
Switches are used for RS485 Full Duplex mode to terminate Tx+ & Tx- and Rx+ & Rx- with 120
ohms. Both switches should be in the on position. For all other modes, the switches should be in
the off position.
The data connector pin-out is as below:
Settings by Data Type (Port 1 or 2)
TECH SUPPORT: 1.888.678.9427
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Assign IP Address to a Terminal Server
A unique IP address has to be assigned to each terminal server device. You can connect one
at a time to change the default IP address. The default IP address of the device is the same:
192 .168.10.1.
Connect the terminal server on to your local Ethernet network which your PC is connected to, and
power on the unit.
Follow the steps below to set up your PC IP address to the same subnet as the terminal servers.
Disable the machine’s wireless network connection and any other internet connections that could
interfere with the network being created.
Select the Internet Protocol (TCP/IP) connection within the Local Area Connection Properties from
start -> Control Panel -> Network Connections -> Properties.
Next, manually set your IP address to 192 .168.10.100, for instance, and your subnet mask to
255.255.255.0, as shown below.
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Click OK to finish the setting.
Open the browser on your PC, and type in 19 2.168 .10.1 and open the Terminal Server Log in Page
as shown.
The default User Name and Password are both admin
Log in to the Terminal Server Home Page as shown.
Terminal Server Log in Pop-up
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Terminal Server Network Page
Click on the Device IP Address text box.
Change the IP address to an IP address with subnet appropriate for your network. In the following
examples an IP address in subnet 192 .168 .10.x x x will be used.
Configure the IP address to 192.168 .10.10 as shown in the Terminal Server Network Page.
Click Submit New Settings.
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Terminal Server Configuration Page
Log in to the terminal server again using the new IP address.
If an IP address in a different subnet was used, be sure to change the PC’s network address to an
IP address in the appropriate subnet.
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Using Terminal Server as a Serial Extender over Ethernet
TCP Transport
To use the Terminal Server as a serial extender over Ethernet, connect two terminal servers to your
local Ethernet network.
Configure Server
Configure the first device as a server:
» Set protocol to TCP/SSL on Network page.
Figure 1 Terminal Server Network Page
» Click TCP link
» Configure Port1 to listen for incoming connections on port 24
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» Click Serial link
» Configure Port1 for RS422
TECH SUPPORT: 1.888.678.9427
Figure 2 Terminal Server TCP Page
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Figure 3 Terminal Server Serial Page
Configure Client
» Configure the second device as a client.
» Set protocol to TCP/SSL on Network page.
Figure 4 Terminal Client Network Page
» Click TCP link
» Configure Port1 to connect to 192.168.10.1 port 24
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» Click Serial link
» Configure Port1 for RS422
TECH SUPPORT: 1.888.678.9427
Figure 5 Terminal Client TCP Page
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Figure 6 Terminal Client Serial Page
TECH SUPPORT: 1.888.678.9427
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UDP Transport
To use the Terminal Server as a serial extender over Ethernet utilizing UDP, connect two terminal
servers to your local Ethernet network and configure devices as a client server connection.
Configure Server
» Set protocol to UDP on Network page.
Figure 7 Terminal Server Network Page
» Click UDP link
» Configure Port1 to receive on port 24 & to transmit to 192.168.10.2 on port 25
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» Click Serial link
» Configure Port1 for RS422
Figure 8 Terminal Server UDP Page
Figure 9 Terminal Server Serial Page
TECH SUPPORT: 1.888.678.9427
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