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NE-4100 Series User’s Manual Choosing the Proper Operation Mode
4-4
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.