9.5 Sending/Receiving Flag Operation
9.5.1 No Header (Start Code), Terminator (End Code) "CR":
The “reception done” flag, the “sending active” flag, the GPSEND instruction, and
the GPRECV instruction are related as follows:
● The COM. port has eight reception buffers. The reception process is continued after the
reception done flag (X0, X1, X2, X3) turns ON. The reception done flag (X0, X1, X2, X3)
does not turn OFF immediately following the execution of GPRECV instruction. It will be
turned off at the beginning of the next scan or later.
● After GPSEND instruction is executed, data transmission is started in several μs to several
tens of ms. For time before transmission is started, please refer to the communication cycle
time (SM208-SM210) using the system monitor function.
● After GPSEND instruction is executed, dual sending to the same port is not possible until the
"sending General-purpose communication Sending active flag" (Y8, Y9, YA, YB) turns OFF.
The "General-purpose communication Sending active flag" (Y8, Y9, YA, YB) turns OFF in
instruction execution in the next scan or later following completion of data sending.
9.5 Sending/Receiving Flag Operation
9-28 WUME-FP7COM-07
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