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987
Serial Communications Instructions
Section 3-24
the Inner Board Service Disabled Flag (A42404) and the Error Flag will turn
ON.
An error will occur and the Error Flag will turn ON in the following cases.
• The CPU Unit’s RS-232C port is specified, but no-protocol mode is not
set for the port in the PLC Setup.
• One of the Serial Communications Board’s serial ports is specified, but
no-protocol mode is not set for the port in the allocated DM Setup Area.
• One of the Serial Communications Board’s serial ports is specified, but
the Board does not support no-protocol mode (the Board does not have a
version number).
• The value of C is not within range.
• The value for N is not between 0000 and 0100 hex.
• A send was attempted when the Send Ready Flag was OFF. (The Send
Ready Flag is A39205 for the CPU Unit’s RS-232C port, A35605 for Serial
Communications Board port 1, or A35613 for Serial Communications
Board port 2.)
• TXD(236) or RXD(235) was being executed for the Serial Communica-
tions Board in the cyclic task, the cyclic task was interrupted, and another
TXD(236) or RXD(235) instruction was executed for the Serial Communi-
cations Board in the interrupt task.
• TXD(236) was executed for a serial port on a Serial Communications
Board that was being restarted.
Note Do not program TXD(236)/RXD(235) for a Serial Communications Board’s
port (port 1 or 2) in both the cyclic task and interrupt task. A TXD(236)/
RXD(235) instruction cannot be executed for the Serial Communications
Board in the interrupt task if a TXD(236)/RXD(235) instruction is being exe-
cuted for the Serial Communications Board in the cyclic task. An error will
occur and the ER Flag will be turned ON if a TXD(236)/RXD(235) instruction
is executed for the Serial Communications Board in the interrupt task when
another TXD(236)/RXD(235) instruction was being executed for the Serial
Communications Board in the cyclic task. (These instructions cannot be pro-
grammed in both the cyclic and interrupt tasks even if they are executed for
different ports in the Serial Communications Board.)
Summary of Contents for SYSMAC CS Series
Page 2: ......
Page 4: ...iv ...
Page 30: ...xxx ...
Page 186: ...146 List of Instructions by Function Code Section 2 4 ...
Page 1320: ...1280 Model Conversion Instructions Unit Ver 3 0 or Later Section 3 35 ...
Page 1390: ...1350 CJ series Instruction Execution Times and Number of Steps Section 4 2 ...
Page 1391: ...1351 Appendix A ASCII Code Table ASCII SP Four leftmost bits Four rightmost bits ...
Page 1392: ...1352 ASCII Code Table Appendix A ...
Page 1404: ...1364 Revision History ...