First, the signal is different: the fire-fighting circuit board communicates with the field equipment, and the field equipment should be inspected. The specific frequency is different from each manufacturer, so the signal from the circuit board is generally a pulse signal, unlike the 24V linkage power supply, which provides a relatively constant DC voltage.
Second, the meaning is different: the loop board of the main engine of the fire alarm system is used to register and record the information of the location of the equipment. The loop wiring is bus system, so you can connect intelligent devices such as smoke sensor, module, temperature sensor, manual telegraph, etc. on the loop line, connect the wires, encode the equipment with encoder and record the coding number of the equipment and the location of the equipment.
Compatible design
The ability of electronic equipment to work harmoniously and effectively in various electromagnetic environments. The purpose is to make electronic equipment not only suppress all kinds of external interference, but also make electronic equipment work normally in a specific electromagnetic environment, and at the same time reduce the electromagnetic interference of electronic equipment itself to other electronic equipment.
Choosing a reasonable wire width Because the impact interference caused by transient current on printed lines of PCB is mainly caused by the inductance of printed wires, the inductance of printed wires should be reduced as much as possible.