Whether the signal lines of the automatic fire alarm system are connected in series or parallel.

1.For example, the signal lines from the gas fire extinguishing control panel are connected to each facility separately, whether they are connected in series or parallel.

Connect? It is parallel, because if there is a problem with the line of one node in series, the circuit will be affected.

When the efficiency is high when parallel connection, the impact of the fault on the loop is only a single-node problem, which is a smoke detector.

Failure or partial line failure will not have as much impact on the whole as a series connection.

2.For example, if there are 10 smoke detectors installed on the first floor, then the signal line is counted as 1 circuit or 10 circuits separately.

One circuit, 10 smoke detectors are connected to the top in parallel, and the signal transmission is from a single smoke detector to the signal line of the circuit, without a single first.

3.The question of bus system and multi-wire system, can the bus system calculate the signal line according to the series loop, and does the multi-wire system calculate the signal line in parallel?

The bus system is to string all the circuits to the host at the end, and the multi-wire system is a single or partial loop single line or multi-line string host, the advantage of the multi-wire system is that the safety is higher than that of a single line, and the disadvantage is that the project is too cumbersome. In the bus system, the signal line is calculated according to the series loop between the loop and the host, the single loop is calculated in parallel, and the signal line is calculated in parallel in the multi-wire system.

Upstairs is more fuzzy, depending on the design drawings of the project, the signal line should be divided into circuits, that is certain, the general product ** hang a loop communication line is limited, the power line depends on how many linkage points of your project, if it is recommended to have a group of circuits, a group of power lines! It should be in the case of a fire, if the fire alarm range is large, and the corresponding linkage equipment is more, the DC voltage will drop in voltage, resulting in unsuccessful linkage, and the broadcast line depends on the power of the host amplifier of the product and the working area of the broadcast. There are no restrictions on the rest.

Which devices in the automatic fire alarm system need to be connected to the power cord and which ones are connected to the signal cable?

Smoke Sensor, Temperature Sensor, Manual Alarm Fire Hydrant They are alarm devices, and its 24V and signal lines are shared. It is to be connected to the host offline. Automatically processed within the host.

Alarm bells, sound and light alarms, fire broadcasts, water flow indicators, smoke exhaust valves, air supply valves; These are linkage devices; It is the fire host, and the alarm system receives smoke sensor, temperature sensor, manual alarm, and fire alarm signal; to determine which part is on fire, to link the above related facilities; Alarm bells, sound and light alarms, fire broadcasts, water flow indicators, smoke exhaust valves, air supply valves; This model is different from the manufacturer, and the connection method of the wire cannot be generalized. But the principle is the same. These linkage devices, alarm bells, sound and light alarms, fire broadcasts, water flow indicators, smoke exhaust valves, air supply valves; These devices are controlled by linkage "modules", with signal lines, and 24V power lines.

The host controls the "module". The module is connected to the device. After receiving the fire alarm signal, the host gives the module a linkage signal, and the equipment can work only after the module acts.

1.In the case of bus-based fire alarm systems, the connection method is what you call a "parallel connection". Each bus device has its own address, and the devices connected in series form a bus loop.

2.Yes. To put it simply, it can be understood this way.

It is a parallel mode, the host is connected to the device (smoke detector, etc.) through the driver board, generally a driver board has four circuits (0-3), a circuit is connected to 255 devices, each device can be coded from 1-255, of course, different manufacturers have different designs. Like you said there are 10 smoke detectors installed, and this one is in one circuit.

The second question is not very understanding?

Yes, the bus is what you call a series of 2-wire systems. Multi-line is parallel.

Teacher, I would like to ask, what is parallel connection and what is series connection?