Moxa Technologies DE-304 Installation Guide download pdf (Page 56)

5-16

Ethernet Modem Mode (NPort Express ONLY)

The Ethernet Modem operation mode is designed for use with legacy operating

systems, such as MS-DOS, that do not support TCP/IP Ethernet. By connecting a

1-port NPort’s (applies to models DE-211/311/311M) serial port to the MS-DOS

computer’s serial port, it is possible to use legacy software originally designed to

transmit data via modem, but now transmit the data over the Ethernet.

Figure 3.6

illustrates an

Ethernet

Modem Mode

topology that

consists of two

or more

single-port

NPorts. One

device server

is connected to

a computer

running DOS,

and the other

Fig. 3.6: Ethernet Modem Mode

device servers are connected by a serial cable to CNC machines. The NPort

automatically transmits the card’s data over the Ethernet to multiple computers.

When wishing to “dial out” over the Ethernet, the user simply

uses the remote NPort’s IP address in place of the phone

number as illustrated in the figure.

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Moxa Technologies DE-304 Installation Guide Page 56