How to wire the rail switching power supply, usually the switching power supply of the surveillance camera is 12V and 24V, there are also 5V, according to your surveillance camera with switching power supply, the switching power supply must be DC, the positive and negative poles are usually often marked, can not use a digital multimeter, into the camera is generally four cables, switching power supply positive level, grounding wire, power cord, the camera first look for wire connectors, digital multimeter*** Measurement, there is no digital multimeter to see that the negative level of electrolytic capacitance is a cable, the power line is usually a shielded cable core, the surface layer is a wire joint, and the other is a power plug, even if it is a positive level of electrolytic capacitor, it can also be applied under the dashboard. How to connect the rail switching power supply, connect the power plug and power cord to the security camera below, and connect the other end of the power cord to the AV terminal block of the display or TV. When the switching power supply is plugged into 220V, you will be able to see the image. If you want to record video, be sure to connect the data signal to the camcorder. If the computer monitor is applied, the data signal is connected to the capture card and the mobile phone software is monitored, which is the wiring method of the rail switching power supply.

The flow of the rail switching power supply connection gives:
1. Usually the switching power supply of surveillance cameras is 12V and 24V, also 5V. The following is an example of a 12V example. The switching power supply has 7 wiring parts, which are divided into type and output.
2. Type: Type that there are 3 terminals, from left to right, L, N and ground wire. L means zero wire, N means ground wire, and 3 level marks mean ground wire". The 3 input terminals are common 220V power plugs.
3. Output: The output has 4 terminals, 2 negative and 2 positive stages, 2 negative levels are COM, COM or some switching power supplies are identified (Com1, COM2), and the remaining 2 are positive V, V.
4. The neutral wire, ground wire, and grounding wire of the live wire are the connections of the common power plug, and the negative and positive levels are the positive and negative poles of the surveillance camera. Generally, the 12V10A surveillance power supply is able to show 10 surveillance cameras. For example, if you want to connect 10 surveillance cameras, the negative cascade of the 10 surveillance cameras will be connected to the negative level. The positive electrode is also connected to the positive electrode. Although there are only 2 terminal blocks on the positive and negative stages, if there are many cameras, they can be connected together.
5. If the transformer has an output power plug. Disconnect the 12V output line of the transformer, and carefully inquire about the line identification of the output line online and offline. Generally, there are identification lines, some dotted lines with solid lines, and some child lines. Subsequently, the connected wires match each other.