User’s Manual
Wireless Serial Server GW5120
Copyright © 2009 Neteon Technologies, Inc.
All rights reserved.
7
4. Application
Connectivity
GW5120 provides TCP (Server/Client), Virtual COM (COM port redirect), and UDP operation
modes. It is designed to transmit data between one-or-more serial devices to/from one-or-more
TCP/IP or UDP devices through
wireless
or
wire
Ethernet. The accessibility of serial devices can
be enhanced by using GW5120 through the wireless Ethernet. Examples of serial devices are
PLC controllers, card readers, display signs, security controls, CNC controller, etc.
4.1. TCP & UDP Protocols
GW5120 can be operated in two most common protocols
TCP
and
UDP
.
4.1.1. Transmission Control Protocol (TCP)
TCP provides a connection and a byte oriented data stream with control parameters such as flow
control, multiple ports option, and order delivery notification. Once the connection is established,
data can be transmitted in both directions. TCP guarantees data is transmitted from one node to the
other node(s) in orderly. The protocol also distinguishes the transmitted data for different
applications (such as a Web server or an Email server) on the same computer.
For redundant or dual-network connectivity purposes, GW5120 offers two operation modes, TCP
Server and TCP Client, which users may choose for their specific application.
4.1.2. User Datagram Protocol (UDP)
UDP is a faster datagram delivery protocol. It is a connectionless protocol and can transmit
multicast data to/from a serial device to one/multiple host computer. Since UDP is the
connectionless protocol, it does not guarantee the reliability and orderly data streams like TCP
protocol. Datagram may arrive out of order or lose without notice. On the other hand, UDP is able
to reduce the network traffic and increase the speed. UDP is faster and hence more attractive in
time-sensitive applications. GW5120 can be set as UDP mode to utilize these advantages.
4.2. Connectivity Topology
With Tunneling and Virtual COM operation modes, GW5120 is designed to transmit data to/from
multiple serial devices and from/to multiple TCP/IP devices on Ethernet. It can enhance the
accessibility of the serial devices immensely
.
The example of GW5120 connection topology is
shown on
Fig 4
.
Fig 4. Typical Topology of GW5120 Connection
