B&B Electronics VESR321_ML_SL - Manual - Manual (Page 25)

Properties
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Model
The Model number of the currently selected serial server is displayed on the Vlinx Manager login
page.
Network Protocols
Network Protocols available for use on VESR321 serial servers include TCP, UDP, VCOM and
Paired Mode.
Network Watchdog
Network Watchdog controls when a connection is forced to close.
When the network watchdog mode is set to “when data is not received on that connection for a
period of time”, it controls the duration of network inactivity when a network connection is
determined idle and causes the connection to be forced closed. The range is 1 through 65535
minutes.
When the network watchdog mode is set to “after the connection has been idle and
unsuccessfully probed for a period of time
”, it will control the length of time that unsuccessful TCP
keep-alive probe attempts will be permitted before the connection is determined to be broken and
the connection is forced closed. The range is 2 through 65535 minutes.
Paired Mode
Paired Mode enables two serial servers to operate across the network like a "wire replacement"
between two serial devices. (Paired Mode is also called serial tunneling.) Serial devices
connected to serial servers on each end of the link can communicate as if they were connected
by a serial cable.
For Paired Mode to work one serial server must be configured as a TCP server and the other as
a TCP client.
The serial server configured as the TCP client initiates connections. You must set up the IP
address and port number of the server that you want the client (serial server) to communicate
with. You also select whether you want the serial server to connect at power up or only when it
receives data from the device connected to its serial port.
The serial server configured as a TCP server waits for connections to be initiated by another
network device. You must set up the TCP port number on which it will listen for connections and
set the maximum number of simultaneous connections it will accept. (Up to 4 connections are
allowed in Vlinx manager.) You can filter the connections it will accept based on specific IP
addresses or ranges of IP addresses that you specify.
Password
When you first receive the VESR321 serial server from the factory the Password is blank so that
you can initially access the serial server without entering a value into this field. To ensure security
you should create and save a password the first time you configure the serial server. After a
password has been set up it must be entered each time you login to Vlinx Manager. The
password is used to access the configuration pages from the Vlinx Manager Login page and can
be changed from the General page.