Mitsubishi Electric MELSEC iQ-RJ71C24-R4 - NULL Character Removal to Send Data Using Nonprocedural Protocol

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25 AUTOMATIC REMOVAL OF NULL CHARACTERS INCLUDED IN SEND DATA
25.3 NULL Character Removal to Send Data using Nonprocedural Protocol
25.3 NULL Character Removal to Send Data using
Nonprocedural Protocol
This section explains automatic removal of NULL characters to data to be transmitted using the nonprocedural protocol.
Target range of automatic removal of NULL characters
The send data range to which automatic removal of NULL characters is performed is as shown below:
• Transmitting data in arbitrary format
• Transmitting data with user frame
When data is transmitted, C24 performs the processing as follows:
C24 deletes NULL characters (data code: 00H) included in the data specified by the CPU module (arbitrary data portion in a
transmission message) or a user frame portion, and transmits data.
NULL characters (00H) included in the send data in the buffer memory (send area) are deleted from the actual data to be
transmitted.
Target range of NULL characters automatic deletion
Arbitrary data
Target range of NULL characters automatic deletion
User frame
(first frame)
User frame
(last frame)
Arbitrary
data
(H)
00
H
04
H
(L)
(0004
H
)
00
H
43
H
(0043
H
)
32
H
31
H
(3231
H
)
00
H
33
H
(0033
H
)
42
H
41
H
(4241
H
)
31
H
32
H
21
33
H
41
H
A3
42
H
43
H
CB
Target device
When transmitting data in arbitrary format
Buffer memory (transmission area)
Head data
Arbitrary data
Transmission
data count
Send
Transmission
data
(The data count is in word units)