Q3(Questions) Which timing does the slave station establish the connection with the master station?


The slave station sets up communication when the CONNECT command is received.
The connection is established at the timing when the bit 2 (CMDRDY) of the status field for the response of the CONNECT command (the 3 or 4th byte) turns on.

Also when it connects by synchronous communication, it becomes synchronous establishment at the same timing.