Yokogawa PC-Based MX100 - Manual (Page 51)

2-28
IM MX190-01E
CDAQHandler Class
This class is a base class of the handler. It provides communication functions.
The communication format is TCP/IP. The communication is controlled using the
communication descriptor. The communication descriptor is stored in the
communication descriptor field of the data member using a pointer to the general
type. The communication descriptor is constructed when the connection is made
and destructed when the connection is dropped.
To change the communication format, create an inheritance class and override all
communication member functions.
The data acquisition function is defined so that it can be called without knowing the
model. However, this class cannot be used with only the definition. It must be
overridden with the inheritance class before being implemented.
A function is provided that checks whether the instance has inherited this class.
You can override with an inheritance class.
Public Members
Construct/Destruct
CDAQHandler Constructs an object.
~CDAQHandler Destructs an object.
Communication Functions
open Establishes a connection.
close Drops the connection.
sendLine Sends string data.
receiveLine Receives string data by lines.
setTimeOut Sets the communication timeout (setting of the
communication timeout is not recommended (see
section 2.2)).
Data Retrieval Functions
getData Gets the measured data.
getChannel Gets the channel information data.
Utilities
getVersionAPI Gets the version number of this API.
getRevisionAPI Gets the revision number of this API.
getErrorMessage Gets the error message string
getMaxLenErrorMessage Gets the maximum length of the error message
string.
isObject Checks an object.
2.4 Details of the MX100/DARWIN Common Class