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Chapter 1
About the Modbus Protocol Converter
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General
The protocol converter webSCADA device can be used to connect a Modbus/TCP
master to one or several Modbus/RTU slaves and also view Modbus registers on
a web-page. The module has a simple configuration interface to define which
registers will be viewed on the web-pages. It also contains an alarm-handler to
send alarms via email or SMS (requires a GSM-modem) and logging capabilities.
This application note describes how to create a configuration in the webSCADA
module; it acts as a bridge from Modbus TCP to Modbus RTU, making it possible
for a Modbus TCP based controller to connect with Modbus RTU based devices.
The webSCADA is a device designed that is not only to provide the bridging
function, but to also handle alarm management, data-logging as well as providing
a web-based user interface for accessing data.
The protocol converter Modbus TCP/RTU supports an RS-232 connection through
a 9-pole DSUB and RS-232 or RS-485 through the screw terminals. It also
supports 10/100Mbps Ethernet through a standard Ethernet connector (RJ-45).
It can be configured via a user-friendly web-interface or by using the Config utility.
Note:
The Physical serial interface enabled can be changed through the Holding
register no. 30 (Physical interface). See Appendix B - Internal registers for
details.
Summary of Contents for DY-5121
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