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2 Instructions
CP1E CPU Unit Instructions Reference Manual(W483)
Serial Communication
Instructions
2
RXD
Related Auxiliary Area Words and Bits
Auxiliary Area Flags for CPU Unit’s RS-232C Port
Auxiliary Area Flags for Serial Option Board Port
Related PLC Setup Settings
Name Address Contents
RS-232C Port Reception Completed Flag A392.06 ON when no-protocol reception is completed.
Number of Receive Bytes Specified: The flag will turn ON when the specified number of
bytes has been received.
End Code Specified: The flag will turn ON when the end code is received or when 256
bytes have been received.
RS-232C Port Reception Overflow Flag A392.07 ON when more than the expected number of receive bytes has been received.
Number of Receive Bytes Specified: The flag will turn ON when anything is received
after reception has been completed and execution of the next RXD(235).
End Code Specified: The flag will turn ON when anything is received after the end code
has been received and execution of the next RXD(235) or when the 257th byte of data is
received before the end code is received.
RS-232C Port Reception Counter A393 Counts in hexadecimal the number of bytes received in no-protocol mode (0 to 256 decimal).
Name Address Contents
Serial Option Board port Reception Completed
Flag
A392.14 ON when no-protocol reception is completed.
Number of Receive Bytes Specified: The flag will turn ON when the specified num-
ber of bytes has been received.
End Code Specified: The flag will turn ON when the end code is received or when
256 bytes have been received.
Serial Option Board port Reception Overflow
Flag
A392.15 ON when more than the expected number of receive bytes has been received in no-
protocol mode.
Number of Receive Bytes Specified: The flag will turn ON when more data is
received after reception was completed but before the received data was not read
from the buffer with RXD(235).
End Code Specified: The flag will turn ON when 257 or more bytes of data are
received without an end code.
Serial Option Board port Reception Counter A394.00 to A394.15 Counts in hexadecimal the number of bytes received in no-protocol mode (0 to 256
decimal).