71
Communication Method
8.7 Communication Method
Various messages are supported for controlling the device through the interfaces.
Messages can be either program messages, sent from the PC to the device, or response
messages, sent from the device to the PC.
Message
Program messages
Response message
Command message
Query message
Message types are further categorized as follows.
Program messages
Response message
This device
PC
Message format
Program messages
Program messages can be either command messages or query messages.
(1) Command messages
Instructions to control the instrument, such as to change or reset the instrument settings.
Example:
Instruction to set the range
:ROUT:CLOSE 101
Header portion
Space
Data format
(2) Query messages
Requests for responses relating to results of operation or measurement, or the state of device
settings
Example:
Request for the present measurement range
:ROUT:CLOSE?
Header portion
Question mark
See: "Headers" (p. 72), "Separators" (p. 73), and "Data formats" (p. 74)
8
Communication Function
HIOKI SW1001A961-04
Содержание SW9001
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