How to answer the access control phone on the red, blue, black, white and yellow lines?

1, find a five-core cable (network cable, telephone cable, ordinary cable) to pass through the wall from the hole where the doorbell is installed at home. The pipeline in the wall has embedded threading steel wire. If not, wear one yourself, which is about less than 3 meters long. The outer end is on the top of your security door, and there is a round cover. Remove the cover and you will see the pre-assembly.

2. There are four wires on the intercom, which are connected with the just-worn four-core wire. Please wrap the insulating tape and remember the wiring sequence of 1234.

There is an iron baffle near the right side of the unit door. Open the baffle with a Phillips screwdriver. As shown above, the red+black on the right is the power supply of the controller. You don't have to touch it. Look at the three terminals in the upper left corner. These lines are usually yellow (I), black (II) and red (III), and I mark them with Roman numerals respectively. Then find your house number. For example, my house number is 10 1, and I find that the thread on the terminal of 10 1 is brown. If there is no wiring on 10 1, you can find an unoccupied wire among many thin wires and screw it on yourself.

4. Go back to step 1, find the circular baffle, and connect the 1 line of the intercom doorbell with yellow (1), the second line with black (2), the third line with red (3), and the fourth line with the brown line of 10 1 room.