Moxa NPORT 5110-T Uživatelský manuál stáhnout pdf (Strana 20)

NPort 5100 Series Choosing the Proper Operation Mode

4-2

Overview

NPort 5100 serial device servers network-enable traditional RS-232/422/485 devices, in which a serial device

server is a tiny computer equipped with a CPU, real-time OS, and TCP/IP protocols that can bi-directionally

translate data between the serial and Ethernet formats. Your computer can access, manage, and configure

remote facilities and equipment over the Internet from anywhere in the world.

Traditional SCADA and data collection systems rely on serial ports (RS-232/422/485) to collect data from

various kinds of instruments. Since NPort 5100 Serial Device Servers network-enable instruments equipped

with an RS-232/422/485 communication port, your SCADA and data collection system will be able to access all

instruments connected to a standard TCP/IP network, regardless of whether the devices are used locally or at

a remote site.

The NPort 5100 is an external IP-based network device that allows you to expand the number of serial ports for

a host computer on demand. As long as your host computer supports the TCP/IP protocol, you won’t be limited

by the host computer’s bus limitation (such as ISA or PCI), or lack of drivers for various operating systems.

In addition to providing socket access, the NPort 5100 also comes with a Real COM/TTY driver that transmits

all serial signals intact. This means that your existing COM/TTY-based software can be preserved, without

needing to invest in additional software.

Three different Socket Modes are available: TCP Server, TCP Client, and UDP Server/Client. The main

difference between the TCP and UDP protocols is that TCP guarantees delivery of data by requiring the recipient

to send an acknowledgement to the sender. UDP does not require this type of verification, making it possible

to offer speedier delivery. UDP also allows data to be unicast to only one IP address, or multicast to groups of

IP addresses.

Real COM Mode

The

NPort 5100 comes equipped with COM drivers that work

with Windows 95/98/ME/NT/2000/XP systems, and also TTY

drivers for Linux systems. The driver establishes a transparent

connection between host and serial device by mapping the

IP:Port of

the NPort 5100

’s serial port to a local COM/TTY port

on the host computer.

Real COM Mode also supports up to 4

simultaneous connections, so that multiple hosts can collect

data from the same serial device at the same time.

ATTENTION

The driver used for Real COM Mode

is bundled with NPort Administrator. The driver is installed on your

computer automatically when you install NPort 5100 Administration Suite.

One of the major conveniences of using Real COM Mode is that Real COM Mode allows users to continue using

RS-232/422/485 serial communications software that was written for pure serial communications applications.

The driver intercepts data sent to the host’s COM port, packs it into a TCP/IP packet, and then redirects it

through the host’s Ethernet card. At the other end of the connection, the NPort 5100 accepts the Ethernet

frame, unpacks the TCP/IP packet, and then sends it transparently sends it to the appropriate serial device

attached to one of the NPort 5100’s serial ports.

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