DIP dial switch is used to set the different working modes and configurations. Refer to Figure 3-4 for the DIP dial switch setting and the corresponding working mode and configuration

DIP-1 DIP-2 DIP-3: Set the valve type

.ON，ON，ON No valve
.OFF，ON，ON 3-port valve (default)
.ON，OFF，ON 4-port valve
.OFF，OFF，ON 3-port distribution valve
.ON，ON，OFF Reserved for other valve type
.OFF，ON，OFF Y-block valve
.ON，OFF，OFF Reserved for other valve type
.OFF，OFF，OFF  Mode for software setting

DIP-4: Set the auto mode when power on

DIP-4 is used to turn on or turn off the auto mode when power on.
.DIP-4 ON  
Turn off the auto mode: not run the command strings in the EEPROM when power on (default)
.DIP-4   OFF
Turn on the auto mode: run the command strings in the EEPROM when power on 

DIP-5: Set the baud rate

DIP-5 is used to set the baud rate:
.DIP-5 ON   38400bps
.DIP-5 OFF 9600bps (default)

DIP-6: Communication interface

DIP-6 is used to set the communication interface:
.DIP-6 ON   RS-232 
.DIP-6 OFF RS-485 (default)