Returnstar Interactive Tech IQTouch L Series User Manual page 22

3. General settings
The general settings include functions such as centralized control switch,
temperature monitoring, no signal standby, channel name customization, and floating
menu switch.
(1) Centralized control switch: The centralized control function is to remotely
control some basic functions such as sound addition and subtraction and channel
switching through the R232 serial port. To use the centralized control function, the
centralized control switch needs to be turned on.
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