Vlinx Vlinx VESR321, Руководство пользователя

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For a Class C network (IP addresses 192.0.0.0 through 233.255.255.255) the default subnet
mask is 255.255.255.0
For a Class D network (IP addresses 224.0.0.0 through 239.255.255.255) and Class E Networks
(IP addresses 240.0.0.0 through 255.255.255.255) the subnet mask is ignored.
VESR321 serial servers come from the factory with a default subnet mask value of:
255.255.255.0
TCP (Transmission Control Protocol)
TCP (Transmission Control Protocol) provides reliable connection-oriented network
communication with error checking. In TCP mode the serial server can be configured as a client
or a server.
When the serial server is configured as a TCP client it initiates connections with a server on the
network. 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 the serial server is to connect at
power up or only when it receives data from the device connected to its serial port.
When the serial server is configured as a TCP server it waits for connections to be initiated by
another network device. You must set up the TCP port number that it will listen to for connections
and set the maximum (up to four) number of simultaneous connections it will accept. You can
filter the connections it will accept based on specific IP addresses or ranges of IP addresses that
you specify.
UDP (User Datagram Protocol)
UDP (User Datagram Protocol) enables applications using UDP socket programs to
communicate with the serial ports on the serial server. UDP protocol provides connectionless
communications, which allows data to be broadcast to and received from multiple nodes on a
network. (Because it is a connectionless protocol UDP does not guarantee the delivery of a
datagram and the datagram is only be sent once.)
In UDP mode, if you want to control what network node receives data, you must specify the IP
address and UDP port the data will be sent to. You can choose to send to:
Nobody
All nodes at a specific UDP port number. (This is called broadcast.)
Specific IP addresses and UDP port numbers. (This is called unicast.)
A range of IP addresses and UDP port numbers. (This is called unicast range.)
You can also configure the serial server to receive from nodes on the network using the same list
of configuration options.
VCOM (Virtual COM Port)
When the Network Protocol is set to VCOM (Virtual COM Port) the serial server communicates
over the network with a PC, acting as a remote COM port for the computer.
Both the serial server and the computer must be configured for VCOM operation. Virtual COM
ports can be set up on the PC using the Vlinx Manager software.