NE-4100 Series User’s Manual
Choosing the Proper Operation Mode
4-4
Real COM Mode
Real COM Mode
Real COM mode allows users to continue using
software that was written for pure serial
communications applications. Each module comes
equipped with COM drivers for Windows systems (95
and above). The serial module’s serial port is mapped
by the driver to an IP address and port number. 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 module accepts the Ethernet
frame, unpacks the TCP/IP packet, and then
transparently sends the data to the attached serial
device. The driver thus establishes a transparent
connection between the host and serial device,
allowing the host to treat the networked device as if it
were directly attached.
ATTENTION
The Real COM driver comes with Network Enabler Administrator, which is part of the NE-4100
Series Administration Suite.
ATTENTION
Real COM mode can allow several hosts to have simultaneous access to the module. The driver
controls host access to attached serial devices by checking the host’s IP address against the
Accessible IP list.
Use the Accessible IP table to restrict access to the module when a public IP address is required
for your application.
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