Data Communications Using User Frames - Mitsubishi MELSEC L Series User Manual

11 DATA COMMUNICATIONS USING USER FRAMES

Registering the fixed format portion of the message transmitted/received by the
opposite device and the Q series C24 as a user frame beforehand allows data
transmission/reception using a user frame.
The use of the user frame to perform data transmission/reception facilitates the
creation of transmission data on the programmable controller CPU side and a
simplified sequence program for checking the reception data.
This Chapter explains the data transmission/reception method and procedure when
performing data communication with the Q series C24 non procedure protocol using a
user frame.
Q series C24
For more details on the "Transparent code" and "ASCII-BIN conversion" used in the
explanations of this chapter, see the chapters listed below. When using transparent
codes or performing data communication using ASCII-BIN conversion, please read
the following chapters, as well.
• When using transparent codes: See Chapter 12.
• When performing data communication using ASCII-BIN conversion: See Chapter
11 - 1
User frame
Data
transmission
Arbitrary data
Arbitrary data
Data
transmission
User frame
POINT
13.
11 DATA COMMUNICATIONS USING USER FRAMES
Opposite device such as a bar code reader
or ID controller personal computer
11
11 - 1