B&B Electronics Serial Servers Vlinx VESR9xx, Инструкция по эксплуатации

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Serial Server Properties
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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.