Axis 2490 Посібник для початківців - Сторінка 2
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Друкувати сторінкуAXIS 2490 Getting Started Guide
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:
to
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.
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.
to
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.
to
Two serial devices connect to
each other via a "virtual extension
cable".
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5
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Pinouts for the RS-232 port
Pin
Function
I CD (Carrier Detect)
1
I RXD (Receive Data)
2
O TXD (Transmit Data)
3
O /DTR (Data Terminal Ready)
4
- GND (Ground)
5
I /DSR (Data Set Ready)
6
O /RTS (Request To Send)
7
I /CTS (Clear To Send)
8
I /RI (Ring Indicator)
9