User manual Version 1.0
EW5302 Wireless Serial Server
Copyright © 2007 Atop Technologies, Inc.
All rights reserved. Designed in Taiwan
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4. Application Connectivity
The EW5302 is designed to transmit data between one or more Ethernet/serial devices to/from one or more
TCP/IP devices through wireless Ethernet interface. EW5302 can enhance the accessibility of the serial
device through the ubiquitous TCP/IP based Ethernet as well as Wireless Ethernet. The connection
distance limit is overcome by EW5302. Examples of these devices are PLC controllers, card readers,
display signs, security controls, CNC controller, etc.
4.1. TCP & UDP Protocols
EW5302 can operate in two most common transportation 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, EW5302 offers two TCP operation modes so users
may choose for their specific application, TCP Server Mode and TCP Client Mode.
4.1.2. User Datagram Protocol (UDP)
UDP is a faster datagram delivery protocol. User can configure EW5302 to work in the UDP mode. UDP is
connectionless protocol and can transmit multicast data to/from a serial device to one/multiple host
computer. Because UDP is the connectionless protocol, UDP does not guarantee the reliability and orderly
data streams like TCP protocol. Datagram may arrive out of order or lose without notice. But the advantage
of UDP is the speed. UDP is faster and hence more attractive in time-sensitive applications.
4.2. Connectivity Topology
EW5302 is also equipped with Tunneling and Virtual COM operation modes. It is designed to transmit data
to/from multiple serial devices and from/to multiple TCP/IP devices on Ethernet, so it can enhance the
accessibility of the serial devices immensely
.
The example of EW5302 connection topology is shown in Fig.
4.
Note: Please do not connect more then one device on LAN port.
Fig. 4.
Typical Topology of EW5302 Connection
