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eWON500™
The Transparent Gateway
ver 1.0
9/11/05
User Guide
TRANSPARENT IP/SERIAL GATEWAY
Principles
The eWON500™ is a transparent gateway: it enables a connection between a PLC connected to
it by its serial link (i.e. with protocol=ModbusRTU), and a supervisor which is connected to the
eWON500™ by its Ethernet link (i.e. with protocol=ModbusTCP). “Transparent” means that the
eWON500™ just transmits the data stream from the TCP interface to the serial interface without
understanding the content of the frame.
Transparent Gateway configuration with eWON500™
It is really simple to configure the Transparent Gateway feature with an eWON500™:
The only thing to do is to establish a serial connection with the PLC.
The eWON500™ configurable serial port
Depending on the serial link which is supported by the target PLC, the eWON500™ serial port dip-
switches (left bottom side from the eWON500™ when you face its LEDs panel) must be
configured for RS-232 or RS-485 mode.
A label describing the switches configuration stands just close from the dip-switch panel.
In case of doubt, please refer to the eWON500™ Installation Guide
(Configurable serial port chapter) you can download from the eWON web site:
(http://www.ewon.biz
Support/Documentation/User guides).
The eWON500™ IO servers
The eWON500™ requires a kind of driver to be able to “speak” the protocol from the PLC. At this
time, the eWON500™ embeds several drivers (called IO servers), each of them can be configured
from a distinct configuration web page from the eWON500™ interface:
From the eWON500™ main menu, click on IO Server Config then select the required IO Server:
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