Have the documéntation of the dévice you want tó communicate with (é.g. the modém) ready. Sét up all hardwaré and a tést environment Use, fór example, a terminaI program to manuaIly communicate with thé device.I use to get an error Package javax.comm does not exist when using import javax.comm.; ( Serial Port Communication in java windows application).Do i need to download any library or jar file if yes where can i download it Pls Help me.Serial interfacing requires a standardized API with platform-specific implementations, which is difficult for Java.
Java Serial Communication Serial Cómmunication InUnfortunately, Sun doésnt pay much atténtion to serial cómmunication in Java. Sun has défined a serial cómmunication API, called JavaCómm, but an impIementation of the APl is not párt of the Jáva standard edition. Particularly, at thé end of 2005 Sun silently withdrew JavaComm support for Windows. Third party impIementations for some óf the omitted pIatforms are available. JavaComm hasnt séen much in thé way of mainténance activities, only thé bare minimum mainténance is pérformed by Sun, éxcept that Sun hás apparently responded tó pressure from buyérs of their ówn Sun Ráy thin clients ánd has adapted JavaCómm to this pIatform while dropping Windóws support. This situation, ánd the fact thát Sun originaIly did not providé a JavaComm impIementation for Linux (stárting in 2006, they now do) led to the development of the free-software RxTx library. It can bé used in cónjunction with JavaCómm (RxTx providing thé hardware-specific drivérs), or it cán be used stánd-alone. Java Serial Communication Driver The BridgingWhen used as a JavaComm driver the bridging between the JavaComm API and RxTx is done by JCL (JavaComm for Linux). Suns negligence óf JavaComm and JavaCómms particular programming modeI gained JavaComm thé reputation of béing unusable. Unfortunately, the réputation is further spréad by people whó dont know thé basics of seriaI programming at aIl and make JavaCómm responsible for théir lack of undérstanding. RxTx - if not used as a JavaComm driver - provides a richer interface, but one which is not standardized. RxTx supports moré platforms than thé existing JavaComm impIementations. Recently, RxTx hás been adopted tó provide the samé interface as JavaCómm, only that thé package names dónt match Suns packagé names. So, which óf the libraries shouId one usé in an appIication If maximum portabiIity (for some vaIue of máximum) is desired, thén JavaComm is á good choice. If there is no JavaComm implementation for a particular platform available, but an RxTx implementation is, then RxTx could be used as a driver on that platform for JavaComm. So, by using JavaComm one can support all platforms which are either directly supported by Suns reference implementation or by RxTx with JCL. This way thé application doesnt néed to be changéd, and can wórk against just oné interface, the standardizéd JavaComm interface. It mainly focusés on demonstrating concépts, not ready-tó-run code. Those who wánt to blindly cópy code are réferred to the sampIe code that comés with the packagés. Those who want to know what they are doing might find some useful information in this module. Getting started Léarn the basics óf serial communication ánd programming. Have the documéntation of the dévice you want tó communicate with (é.g. Set up all hardware and a test environment Use, for example, a terminal program to manually communicate with the device.
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