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4 Using Protocol Macros
4-6
CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
z
Step Parameters
Precautions for Correct Use Precautions for Correct Use
We recommend programming retry processing at any device that sends commands in case of
noise or other factors result in transmission errors.
Parameter Meaning
Command One of the following: Send, Recv, Send&Recv, Wait, Flush,
Open, or Close
Messages Send message The message sent for Send.
Receive message The expected message for Recv.
Send message and
receive message Both the message sent and the expected receive message
for Send&Recv.
Reception matrix A group of expected messages that you can use to switch to
different next processes when Send or Send&Recv is used.
Repeat counter The number of times to repeat the step (0 to 255). The repeat counter can be used to
change send/receive messages.
Retry count Used for Send&Recv to retry the command for errors (0 to 9).
Send wait time Used for SEND or Send&Recv to create a wait time before data is sent.
Response write
enable (for operand
specification) Specifies whether or not to write the received data to memory.
Next process Specifies the next step or to end the sequence when the current step is completed
normally.
Error processing Specifies the next step or to end the sequence when the current step ends in an
error.