In the fire system why the water flow indicator needs modules, and sound and light alarm does not require modules, sound and light alarm is also linked to the module?
Sound and light alarm can be encoded with the address, no need to drive the module. The flow indicator is required to pass the action after the module signal, and then the module input signal back to the host.
The flow indicator needs to monitor the module and transmit the indicator action to the alarm host. Sound and light alarm does not require modules
In fact, you can understand, sound and light alarm is a built-in module, and the flow indicator is through the module to perceive the flow of action.
