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7.3 Flag Operations in Transmission / Reception
■
Special relays
General-purpose
communication reception
done flag
General-purpose
communication transmission
done flag
(Note 1)
The Nos. in brackets indicate devices that are compatible with existing FP-X / FPsigma.
● Note that the reception done flag (R913A) changes even while a scan is in progress.
(e.g., if the reception done flag is used multiple times as an input condition, there is a possibility
of different statuses existing within the same scan.)
As a protective measure, replace it with an internal relay at the beginning of the program.
7.3.2 When the Header is Set to "STX" and the Terminator to "ETX"
■
When receiving data: The reception done flag, the transmission done flag, and
the F159 (MTRN) instruction are related as follows:
● The data is stored in the receive buffer in sequential order. When the header is received, the
number of bytes received is cleared, and the address (write pointer) in the receive buffer is
reset to the initial address.
● Reception is disabled when the reception done flag R913A is ON.
7-8
COM0
9132 (903E)
913A (9038)
9133 (903F)
913B (9039)
COM1
COM2
9142 (9048)
9143 (9049)
COM3
914A
914B
WUME-FPXHCOMG-02
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