PLC Modbus 통신

1. PLC 시뮬레이터
http://www.plcsimulator.org/

2. java lib
- jad lib
https://github.com/benvm/android-jamod-TCP
http://forum.processing.org/one/topic/using-jamod-java-modbus-library-in-processing.html

- modbus2j


3. Modbus2SQL
http://sourceforge.net/projects/modbus2sql