While the operation of different facilities, which are
connected to a computer via serial port, there may
appear the necessity to start up utility program (for
these facilities) not in the machine, to which the
facilities connect directly, but in the remote
machine, that is connected to the facility server via
the network (TCP/IP).
The developers of the given facilities very often
face with such a necessity. For instance, during the
debugging in a remote machine or when different people
with the help of different machines (which are
nevertheless connected to one machine) maintain the
same facilities.
INSD is designed especially for the solving of these
problems. The use of our product gives you the
possibility to give the remote access to serial port
via TCP/IP. The product consists of three parts:
1. NVSD is a program emulator of serial ports (up to
255) for operational system W2K/XP.
2. NNSD client is the service, which realizes the
exchange between NVSD and TCP/IP.
3. NNSD server is a service which realizes the
exchange between a real driver of the serial port and
TCP/IP.

NNSD client and server handle two flows: outcoming
and incoming.
The client takes the bytes that were transferred to
all the virtual ports earlier and then transfers them
to the server, which was started up on the other
computer. Also the client receives flows from the
server and gives the bytes (as those which came from
the outside) to NVSD.
IP address of the receiving server, port number and
the number of the real serial port on the receiver are
specified on the client for each port.
The server receives the information from clients and
then transfers it to the ports specified by them. As
for the flows, which came from these ports, the server
transfers them to the client as well. Besides the data
flow, TCP/IP transfers the overhead information about
the condition of different signals on serial port
physical contacts.

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