User`s manual

311
CHAPTER 12 TRANSPARENT CODES AND ADDITIONAL CODES
12
12.5 Handling Transparent Codes and Additional Codes During Bidirectional Protocol Data
Communication
(b) Sending
• The transmission control code data is added to the transmission data designated by the programmable
controller CPU (arbitrary data section of the transmission message), and that transmission data is
transmitted. If ASCII-BIN conversion is designated, the transmission data is sent after it is converted to
ASCII code data.
• If the sum check code is set to Enable in the transmission setting via GX Developer switch settings, the code
will be calculated from the transmission message and added to the transmission message.
• If a send transparent code is designated, additional code data is added preceding the transparent
code/additional code data for the arbitrary data section, and is then sent.
Data
transmission
Response
reception
Q series C24
Buffer memory
(Transparent code designation)
No
(Sum check code setting) (ASCII-BIN conversion designation)
(Arbitrary data section only)
(Error code section only)
Yes
Deleting
additional code
Adding transmission
control code (ENQ)
Adding
additional code
Deleting transmission
control code
(ACK/NAK)
Calculation and check of
sum check code
ASCII-BIN conversion
of error code
Transmission
area
Transmission
result storage
area
External
device
No No
Yes Yes
No
Yes
No
Yes
ASCII-BIN conversion of
transmission data count
and transmission data