On each AC-215/225/425 control panel you will find a set of 8 dip switches in the upper right corner:
Baud rate: defines the communication speed of Panel for connecting with a PC in a network connection.
Access control Panel Type: 2 Reader or 1 reader per door.
Panel addressing if connected in RS485 network. Below is example till 16 address, this is binary address value from 0 (1) till 31(32).