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4-2SectionConnections
38
6. Program the host and the CPU Unit and execute the programs.
Host-initiated Communications: Host Link Commands
A program must be prepared in the host to send Host Link commands to the
PC and receive responses.
Program to send
commands and
receive responses
Host
Command
Serial Communications Board
Response
PC-initiated Communications: TXD(––) Instruction
TXD(––) must be included in the ladder program to send data from the PC to
the host.
Program to send
responses
Host
Data
Serial Communications Board
CPU Unit
TXD(––)