14 ON-DEMAND DATA COMMUNICATIONS USING USER FRAMES
14.2 User Frame On-Demand Data Transmission and Buffer Memory Used
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14
■Combination
Only the following combinations can be used for arrangement of on-demand data by user frame specification.
: designated data
■Description of data to be transmitted
• The outline of data to be transmitted for on-demand data transmission by user frame specification is shown below.
Combination Data name
Start frame (1st) Start frame (2nd) Send data Final frame (1st) Final frame (2nd)
1
2
3
4
5
6
7
8
Contents of data to be transmitted Communication with ASCII
code
Communication wit binary
code
User frame
• Start frame (1st)
• Final frame (Last 1 frame)
The portions of which registered code
is from 00H to FEH
The data of the code registered in C24 is transmitted. (No conversion)
Combined portions of which
registered code is FFH and 00H to
FFH
The data according to the user-designated contents, code, and number of
bytes is transmitted.
User frame
• Start frame (2nd)
• Final frame (Other than last 1
frame)
The portions of which registered code
is from 00H to FEH
The data of the code registered in
C24 is converted to ASCII data and
transmitted.
The data of the code registered in
C24 is transmitted.
For 10H data, the data of 10H + 10H
is transmitted.
Combined portions of which
registered code is FFH and 00H to
FFH
The data of the contents, code, and
number of bytes designated by the
user to ASCII data and transmitted.
The data of the contents, code, and
number of bytes designated by the
user is transmitted.
For 10H data, the data of 10H + 10H
is transmitted.
Send data
( MELSEC Communication
Protocol Reference Manual)
The designated send data is
converted to ASCII data and
transmitted.
The designated send data is
transmitted by the code unchanged.
(No conversion)
For 10H data, the data of 10H + 10H
is transmitted.
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