ATTENTION
Real COM drivers are installed and configured through NPort Windows Driver Manager.
Real COM mode allows you to continue using your serial communications software to access
devices that are now attached to your NPort device server. On the host, the NPort Real COM
driver automatically intercepts data sent to the COM port, packs it into a TCP/IP packet, and
redirects it to the network. At the other end of the connection, the NPort device server accepts the
Ethernet frame, unpacks the TCP/IP packet, and sends the serial data to the appropriate device.
ATTENTION
In Real COM mode, several hosts can have simultaneous access control over the NPort serial
port. If necessary, you can limit access by using the NPort’s Accessible IP settings. Please refer to
Chapter 8 for additional information on Accessible IP settings.
RFC2217 Mode
RFC-2217 mode is similar to Real COM mode, since it relies on a driver to transparently map a
virtual COM port on a host computer to a serial port on the NPort. The RFC2217 standard defines
general COM port control options based on the Telnet protocol and supports one connection at a
time. Third party drivers supporting RFC-2217 are widely available on the Internet and can be
used to implement virtual COM mapping.
TCP Server Mode
In TCP Server mode, the NPort serial
port is assigned an IP:port address that is
unique on your TCP/IP network. It waits
for the host computer to establish a
connection to the attached serial device.
This operation mode also supports up to
four simultaneous connections, so
multiple hosts can collect data from the
attached device at the same time.
Data transmission proceeds as follows:
1. A host requests a connection to the
NPort serial port.
2. Once the connection is established,
data can be transmitted in both
directions—from the host to the
device, and from the device to the
host.
TCP Server Mode
Request a
connection
Proceed with
data transmission
1
2
1
2
TCP/IP
WLAN
NPort W2250
Antenna
Port 1
RS-232/422/485
Port 2
RS-232/422-485
Wireless Se
rial Device Server
W2250
Reset
Ethernet
12-48 VDC
Ready
WLAN
Serial 1
Serial 2
Serial Signal
Serial Device
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