User Guide

AXIS 2490 Getting Started Guide Page 1 of 5
Using the AXIS 2490 Serial Server
The AXIS 2490 Serial Server allows serial devices to connect directly to an Ethernet network
without using a PC, thus providing convenient remote access to these resources via HTTP
and TCP/IP. A few examples of physical setups using the AXIS 2490 are shown below:
Ports
The AXIS 2490 is used for connecting serial ports to a network via the following:
• Two RS-232 serial ports on 9-pin male DSUB
• One 4-wire RS422 serial port on screw terminal block. This can also be used as a 2-wire
RS-485 port (direction controlled by RTS signal)
Each serial port operates independently of the others and can be used in these modes:
• Generic TCP/IP – used for communication using network sockets, with a COM-Port
redirector, or for tunnel communication between two serial devices or between a serial
device and a PC
• Generic HTTP – allows access via network browser (Netscape 4.x or Internet Explorer 4.x)
The Front Panel
RS-232 serial ports, 9-pin male D-SUB.
Both ports support: RX, TX, RTS, CTS, DSR,
DTR, RI and CD.
Control Button
The Control Button is used to reset the
unit to its default factory settings.
Pinouts for the RS-232 port
Pin Function
1
I CD (Carrier Detect)
2
I RXD (Receive Data)
3
O TXD (Transmit Data)
4
O /DTR (Data Terminal Ready)
5
- GND (Ground)
6
I /DSR (Data Set Ready)
7
O /RTS (Request To Send)
8
I /CTS (Clear To Send)
9
I /RI (Ring Indicator)
5
3
2
7
14
8
96
❶ to ❸ The application
uses a network socket or a
COM-Port redirector to
communicate.
An application that uses a
local serial port will not
work with a networked
serial port. To make the
server’s port appear as a
local port on your PC, you
must install and use a
COM-Port Redirector.
❸ to ❹Two serial devices connect to
each other via a “virtual extension
cable”.
❶
❷
❸
❹
❷ to ❹ PC to Serial Server to network. Use this if you have
an old application that uses the serial port and
when you can’t use a COM-port redirector.