Fieldbus & Industrial Networking


Serial to Ethernet converters

September 2005 Fieldbus & Industrial Networking

Westermo Teleindustri of Sweden (represented in South Africa by Throughput Technologies) has recently released its new Serial to Ethernet converters. The EDW-100 is an Industrial Ethernet to serial adapter or Ethernet Terminal Server.

The serial interface is selectable between RS232 and RS422/485. The Ethernet interface is 10/100Base-T and supports the following networking protocols: TCP, UDP, ICMP, IGMP, HTTP, ARP. When using TCP, the unit can act as a server or client.

Two EDW-100s can be used to provide a serial point-to-point link over an Ethernet network using either UDP or TCP. When using TCP the EDW-100 can be configured as client or server. An ED-Tool configuration set is included for ease of configuration. The figures show the following:

a) Each unit passes data from its serial interface to the serial interface of the other unit. This enables long distance serial communication using pre-existing networks.

b) When EDW-100 is used with the UDP protocol it is also possible to communicate one to many (eg, master to multiple slaves), by using a broadcast address or multicast addressing.

c) EDW-100 can also provide a remote serial interface for a computer connected through a TCP/IP network using COM port redirection software. A COM port redirector or customer written software can be used to create virtual COM ports. This software will redirect data, originally sent to a local COM port, to the remote serial interface of the EDW-100. No changes are required on the computer application software.



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