General Description
The
FieldTalk™ Modbus Master Java Package provides connectivity to Modbus slave compatible devices and applications.
Typical applications are Modbus based Supervisory Control and Data Acquisition Systems (SCADA), Modbus data concentrators, Modbus gateways, User Interfaces and Factory Information Systems (FIS). It also helps publishing plant floor data on the web using Java applets and Java servlets.
Features:
- Robust design suitable for industrial applications
- Full implementation of Class 0 and Class 1 Modbus functions as well as a subset of the most commonly used Class 2 functions
- Standard Modbus boolean and 16-bit integer data types (coils, discretes & registers)
- Support for 32-bit integer and float data types including Daniel/Enron protocol extensions
- Configurable word alignment for 32-bit types (big-endian, little-endian)
- Support of Broadcasting
- Failure and transmission counters
- Transmission and connection time-out supervision
- Detailed transmission and protocol failure reporting with Exception classes
- Thread-safe implementation to support concurrent programming
- Scalable: you can use serial-line Modbus protocols only or MODBUS/TCP or all of them
The package is designed for the Java 2 Platform Standard Edition. It is also compatible with the J2ME Foundation and TINI SDK 1.11 platforms.
The standard Java API does not provide any support for serial ports. However serial port support is available in the form of a Java extension, which must be installed and licensed separately to the JDK and JRE. The Communications API is not part of the supply of FieldTalk.
The serial versions of this package are based on the Java Communications API 2.0. This API is a Java extension, implemented in the package javax.comm.
The Java Communication API is available from different sources:
- Sun Microsystems is publishing versions for the Solaris and the Windows platform at http://java.sun.com/products/javacomm/ .
- Keane Jarvi publishes a LGPL licensed Linux and cross-platform COMM API at http://www.rxtx.org/ .
- An excellently performing package for a large variety of platforms is the SerialPort package from Solutions Consulting at http://www.serialio.com . Using this package, poll cycles of less than 10 ms can be achieved!
- Note:
- Without proper installation of a Java Communications API, the serial versions of the FieldTalk package cannot be used.
