Solvline PCI - Manual (Page 8)

8
About MultiPort
About MultiPort
MultiPort is a multi serial communication device which makes PC to a multi-user or Multi device
system by applying it. Multi-user system or RAS(Remote Access System) is a system which
enables a server computer to be used together by multi users thru the terminal at distance or to
have the information used together.
All the users can access to the server thru the MultiPort equipped on the server at distance and
can use the device connected to the network as if it is his own one, or can access to the file
server as if he is on the LAN. In many cases only one computer is used simultaneously by multi
staff in the company due to the function and economic reason. What makes it possible is the
multi communication access device which connects the operating system with multi user
function and multi users. The typical ones are LAN and the asynchronous serial communication
port. Of these the device which connects the host and multi users locating at distance by using
asynchronous communication port is the MultiPort.
The multi device system is mainly used for the automation system, and it collects and distributes
the data at real time created from each device, or control various devices at distance by a
computer installed at center with several asynchronous devices connected. In other words the
user at center can work at the real time by catching the present status of all devices located at
distance, or controlling the movement of them thru the MultiPort of the computer at center.
The merit of MultiPort is easy and economic to install and maintain.
Meantime LAN has high speed to transmit data, but the more devices connected and users are
involved the more crashes among the transmitted data happens. Once such crashes happens
far more times than some level then the transmitting efficiency is declined suddenly. But it is
possible to realize Read Time without any distance limitation by applying MultiPort because it is
1:1 communication and transmitting capacity can be kept constantly even if several dozens of
port were connected.
At the same time the speed of asynchronous communication is being improved along with the
advanced technique of hardware day by day, so not necessary to worry about the
communication speed.
There are 2 types of MultiPort-Dummy and Intelligent. Dummy MultiPort is the one which has no
processor by itself. It is better in economical viewpoint than Intelligent one in case of smaller
volume in transmitting data and fewer number of port connected to system. Usually it is more
efficient to use Dummy MultiPort when the number of port is not exceeding 32. Meantime
Intelligent MultiPort is rather efficient when required to transmit large volume of data due to its
fast processing speed as it has processor by itself. Furthermore it is possible to connect several
hundreds port to a system, but costs high.