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6-21
6 No-protocol Mode
CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
6-
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I/O Ins
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6
6-3-2 Instr
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Additional Information
n
Flags Related to Instructions Addressed to Serial Communications Units
The changes and processing timing of flags related to instructions addressed to Units (Seri-
alSend and SerialRcv instructions) are shown below.
SerialSend Instruction
Note Internally, the SerialSend instruction uses a command. Instruction processing is therefore
performed in peripheral servicing. To achieve this, sometimes multiple cycles are required
after the instruction is executed to process the send.
SerialRcv Instruction
Note Internally, the SerialRcv instruction uses a command. Instruction processing is therefore per-
formed in peripheral servicing. To achieve this, sometimes multiple cycles are required after
the instruction is executed until the received data is stored in I/O memory.
Additional Information
Refer to the NJ-series Instructions Reference Manual (Cat. No. W502) for details on the instruc-
tions that are used in No-protocol Mode (SerialSend, SerialRcv, and SerialRcvNoClear).
CPU Unit
_Port_isAvailable (Network
Communications Instruction Enabled Flag)
SerialSend
Instruction
executed.
Serial Communications Unit
*_P1_NopSerialSendExecSta and
*_P2_NopSerialSendExecSta
(SerialSend Executing Flag)
Send processing
Send
processing
CPU Unit
Port reception processing
Reception
processing
*_P1_NopRcvCompleteSta and
*_P2_NopRcvCompleteSta
(Reception Completed Flag)
Serial Communications Unit
SerialRcv instruction
Instruction
executed.
_Port_isAvailable (Network
Communications Instruction Enabled Flag)
Writing to I/O memory in the CPU Unit
Write
processing