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1020
Serial Communications Instructions
Section 3-24
Related Flags in the CPU Bus Unit Area
(n = CIO 1500 + 25
×
unit number)
2201 hex
Operation could not be performed during operation. (Operation dis-
abled because Unit is busy sending.)
2202 hex
Operation could not be performed when stopped. (Operation dis-
abled because Unit is switching protocols.)
Word
Bit
Function
Port 1
Port 2
n+8
n+18
04
Overrun Error Flag
1:
The reception buffer contained more than 259
bytes of data before RXDU(255) was executed.
Note:
Once this error flag goes ON, it can be turned
OFF only by turning the power OFF and then ON
again or restarting the Board.
n+9
n+19
06
Reception Completed Flag
0: No data received or currently receiving data
1: Reception completed
0
→
1:
The Board or Unit has received the specified
number of bytes.
1
→
0:
RXD(235) or RXDU(255) was executed to write
the data from the buffer to a CPU Unit data area.
n+9
n+19
07
Reception Overflow Flag
0:
The Board or Unit has not received more than
the specified number of bytes.
1:
The Board or Unit has received more than the
specified number of bytes.
0
→
1:
The Board or Unit received more data after data
reception was completed.
1
→
0:
RXD(235) or RXDU(255) was executed to write
the data from the buffer to a CPU Unit data area.
n+10
n+20
05
Reception Counter
Indicates the number of bytes received in hexadecimal,
between 0000 and 0100 hex (0 to 256 decimal).
Code
Meaning
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...