User`s manual
260
(b) Reception of combination (2-B)
• In this method, a user frame is used as the last frame in place of the non procedure protocol data receive
complete code, and fixed format data is transmitted from the external device.
• Any reception data prior to the last frame are all treated as arbitrary data.
• When data of the same arrangement as the last frame is received, the Q series C24 performs a read request
to the programmable controller CPU.
• Upon the reception of data from this combination that contains no arbitrary data, the reception data count will
be "0" when a read request is performed to the programmable controller CPU.
• The received data count initially set in the Q series C24 uses the default value.
• The Q series C24 performs the following processing with respect to the reception data that is the same as
the receive complete code initially set in the Q series C24.
• When included in the last frame: Reception is not processed via the receive complete code.
By registering ACK + CR + LF as the last frame, a read request is performed to the programmable
controller CPU when the end of the reception data receives a message of ACK + CR + LF.
Handling of the Q series C24 receive data
● When an user frame (first frame, last frame) of a code registered in the Q series C24 is received, receive processing by
user frame is performed.
● Of the first frame No. and last frame No. (maximum 4 sets) initialized by the user at the buffer memory receive user frame
designation area, the set No. ( th) of the user frame received from the external device is stored to the receive user
frame storage area.
● If receive transparent code is designated, the data of the additional code included in the arbitrary data area is removed
immediately after reception (before conversion when the receive data is converted from ASCII code to binary code).
06H 0AH0DH
A
C
K
C
R
L
F
Stored in the reception area
The received data count is "0."
Last frame: ACK, CR, LF
: Reception start timing
: Receive complete timing (read timing)