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1001
Serial Communications Instructions
Section 3-24
Auxiliary Area Flags for CPU Unit’s RS-232C Port
Auxiliary Area Flags for Serial Communication Board’s Ports
Name
Address
Contents
RS-232C Port Reception
Completed Flag
A39206
ON when no-protocol reception is com-
pleted.
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
A39207
ON when more that the expected num-
ber of receive bytes has been received.
Number of Receive Bytes Specified:
The flag will turn ON when anything is
received after reception has been com-
pleted 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 execu-
tion 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.
Port
Name
Address
Contents
Port 1
Reception Completed
Flag
A35606
ON when no-protocol reception is com-
pleted.
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.
Reception Overflow
Flag
A35607
ON when more that the expected num-
ber 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.
Reception Counter
A357
Counts in hexadecimal the number of
bytes received in no-protocol mode (0 to
256 decimal).
Overrun Error Flag
CIO 1908
bit 04
ON when 260 or more bytes of data are
received in the buffer before RXD(235)
is executed.
Summary of Contents for SYSMAC CS1D-CPU**
Page 3: ...iv...
Page 29: ...xxx...
Page 185: ...146 List of Instructions by Function Code Section 2 4...
Page 1389: ...1350 CJ series Instruction Execution Times and Number of Steps Section 4 2...
Page 1390: ...1351 Appendix A ASCII Code Table ASCII SP Four leftmost bits Four rightmost bits...
Page 1391: ...1352 ASCII Code Table Appendix A...