The host computer communicates with each station number one by one.
①The host computer instructs station number/communication contents/memory address/data etc. of the communicating station as a “command.”
②The “command” receiving station processes this data and returns the result as “response.”
Master station 00(8)
Slave station 01(8)
Slave station 02(8)
Slave station 03(8)
On the computer link, the host computer can communicate with any required station regardless of whether it is the master or slave station.