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I am an engineering student in Newfoundland (Canada) stuck for time to come up with code to read/write data over modbus using Java... please let me know if you have any sample source code that I could use as guidance!! I have already looked at http://jamod.sourceforge.net but cannot see the relation between Modbus protocol and Java implementation. thanks!!! email: nancy@engr.mun.ca

Hi

Try register at http://www.modbus.org and download sample projects.

Regards,
Andrzej
www.modbus.pl

I have seen a C++ library for modbus, I'm not sure about JAVA. Perhaps here there's more resource.

http://www.linux-automation.de/index_en.html

You find a commercial Java Modbus driver at http://www.modbusdriver.com/java

modbusDRIVER.com - Modbus Driver and Libraries for Linux, Windows, CE,
.NET, QNX, Solaris, UNIX, Delphi, Java ::: http://www.modbusDRIVER.com

Why not try the Java Comm API? although it will not work with the new Java 1.5 version, but in the lower version. Make sure to write a class for the CRC computation. I will try look for the Java program I did a year ago in on of my project implementation.

Why shouldn't work with java 1.5?

Just find the classes from old versions of Java and put them as library.

(I am working on the same project. However, for the same issue Java is not a priority.)