Campbell Scientific Software Development Kit Beginner's Guide - Manual (Page 9)

2-1
Section 2. LoggerNet SDK
2.1 LoggerNet Overview
LoggerNet is developed around client-server architecture. LoggerNet’s client-
server technology is based on a server that communicates with a network of
dataloggers via various communications technologies. The server listens for
client requests, accepts the requests, and acknowledges to the client that a
request has been received. The server fulfils this request and returns
information to the client.
Often a client makes several requests. The server, however, processes only one
request at time and in the order it was received. Once a client submits a
request to the server, the client is free to do something else, knowing that its
request will be processed. In other words, client requests may not get
immediate response from the server nor do the clients have to stop doing
something else while waiting for an answer. This is called asynchronous
communication.
2.2 LoggerNet SDK Overview
This software development kit contains six ActiveX controls and a limited
version of the LoggerNet server DLL (CORALIB3D.DLL). A developer can
use this SDK to create applications that remotely access an existing LoggerNet
Server; however, the included LoggerNet server direct DLL can only be loaded
and accessed locally.
Installation of this SDK includes source code of examples written in Delphi
6.0, Visual Basic 6.0, and Visual C++ 8.0 MFC that will start the
CORALIB3D.DLL and use the other SDK controls. The install also includes
documentation for developing applications using the methods and functions of
the included SDK controls. Please note that the CORALIB3D.DLL can only
communicate with a datalogger using a direct RS-232 or an IP Port connection
and will not accept remote client connections.
2.2.1 LoggerNet SDK Controls
The LoggerNet SDK controls simplify the task of application development
tremendously by encapsulating complexities inherent in client-server
communications. A summary of these controls and their uses is shown in
Table 2-1.