Mitsubishi Electric MELSEC iQ-R Series User Manual page 549

Serial communication module

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Communication procedure

The following shows the procedure to send/receive data.

■Data communication using the predefined protocol

 Writes the send data to the link register (W) of CPU module to store the send data in the data storage area set in the

packet setting of the predefined protocol support function.

 Executes the REMTO instruction to write the number of continuous protocol executions to the buffer memory of C24.

 Executes the REMTO instruction to write the protocol number to be executed to the buffer memory of C24.

 Executes the protocol by 'CH2 protocol execution request' (YA).

 Checks the protocol execution by 'CH2 protocol execution completion' (XC).

 Reads the predefined protocol execution result, result of the execution count, and matched packet number from the buffer

memory of C24 with the REMFR instruction.

 Reads the data received from the external device which is transferred from the device of the remote head module to the

link register (W) of the CPU module.

: Link refresh

: link dedicated instruction (REMTO, REMFR)

Appendix 7 When Connecting the Module to a Remote Head Module

APPENDICES APPENDIX

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