Measurement-computing DAQFlex User Guide Uživatelský manuál stáhnout pdf (Strana 31)

Chapter 4

DAQFlex Message Reference

The software messages that you send to a DAQFlex supported device are text-based commands. Each

message pertains to a specific DAQ component. A DAQ component is a device element that

encapsulates a DAQ subsystem which has multiple properties or commands associated with it.

DAQFlex components

A DAQ component is a device element that encapsulates a DAQ subsystem which has multiple

properties or commands associated with it. The DAQFlex API defines the following DAQ components:

 DEV — encapsulates device-level operations

 AI — encapsulates single-point analog input operations

 AICAL — encapsulates analog input self-calibration

 AIQUEUE — encapsulates analog input gain queue operations

 AISCAN — encapsulates analog input scanning operations

 AITRIG — encapsulates analog input triggering operations

 AO — encapsulates single-point analog output operations

 AOCAL — encapsulates analog output self-calibration

 AOSCAN — encapsulates analog output scanning operations

 AOTRIG — encapsulates analog output triggering operations

 DIO — encapsulates digital I/O operations

 CTR — encapsulates counter input operations

 TMR — encapsulates timer output operations

Each component has one or more properties associated with it. Each property supports one or more

text-based commands, or messages. These messages are used to communicate with DAQFlex-

supported hardware.

DAQFlex supports two types of messages:

 Device programming messages configure or retrieve a device property value.

 Device reflection messages retrieve information about a device capability, such as the maximum

scan rate or support for an external clock.

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Measurement-computing DAQFlex User Guide Uživatelský manuál Strana 31