Moxa Technologies WE-2100T Series Bedienungsanleitung PDF herunterladen (Seite 4)

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Serial Device Servers

In Pair Connection Mode, two NPort device servers are used to

transmit RS-232 signals over Ethernet, and in this way overcome

the 15-meter limitation imposed by the RS-232 standard. One

NPort connects to the PC's COM port, and the other NPort

connects to the device. Both NPorts are either connected to each

Pair Connection Mode

other by a crossover Ethernet cable, connected to the same LAN,

or connected to a WAN. Both data and modem control signals can

then be exchanged between the PC and the device over Ethernet,

but DCD signals will not be transmitted.

In Ethernet Modem mode, the serial port is connected to a PC's

COM port and behaves as if it were an attached modem. However,

the data travels directly over the network rather than over phone

Ethernet Modem Mode

lines. Ethernet Modem mode enables network access for legacy

software that was originally designed to transmit data by modem.

In Reverse Telnet mode, the serial port provides a connection to a server

and connections are initiated by a host over Ethernet. This is similar to

TCP server mode, except Reverse Telnet mode also provides Telnet-style

CR/LF conversion. Reverse Telnet mode can be used for remote console

management, where the NPort is used to enable network access to the

serial console ports of different equipment, such as routers, switches, or

servers.

Reverse Telnet Mode

Mode Selection Flow Chart

Using legacy

COM-based software?

Host requires more

COM ports?

Using MOXA's

drivers?

Real COM

Mode

RFC2217

Mode

Contact your

saleperson.

Reverse

Telnet

UDP Mode

Start

TCP Server

Mode

TCP Client

Mode

Pair

Connection

Modes

RFC2217

Mode or TCP

Server Mode

Need to extend

serial transmission

range?

Need to perform

console

management?

Host application is

server or client?

Need serial control

parameters?

Using socket

program?

Which protocol,

TCP or UDP?

YESYES

TCPTCP UDPUDP

NONO

YESYES

ClientClient

ServerServer

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