What does the second-level builder test with weak current?

The weak flow of secondary builders is basically in the aspect of building intelligence. In intelligent buildings, digital communication technology, control technology, computer network technology, digital video technology, optical fiber communication technology, intelligent sensing technology and database technology are widely used to form various intelligent subsystems, which are composed of the following contents:

1, CNS (communication network system) 2, OA (office automation system) 3, BA (building automation system) 4, SA (security automation system) 5, FA (fire alarm system) 6, GCS (integrated wiring system) 7, intelligent system integration and building property management system.