What is the rs485 interface on the camera used for?

RS485 is a standard, which defines the electrical characteristics of drivers and receivers in balanced digital multipoint systems, and is defined by telecommunication industry associations and electronic industry alliances.

The box area below is what RS485 interface looks like.

RS-485 is also called TIA-485-A, ANSI/TIA/EIA-485 or TIA/EIA-485.

RS-485 is widely used when the communication distance is required to be tens of meters to thousands of meters. Serial bus standard. RS-485 adopts balanced transmission and differential reception, so it has the ability to suppress common-mode interference. In addition, the bus transceiver has high sensitivity and can detect the voltage as low as 200mV, so it can recover the transmission signal thousands of meters away.

RS-485 works in half-duplex mode, and only one point can be transmitted at any time. Therefore, the transmitting circuit must be controlled by the enable signal. RS-485 is very convenient for multipoint interconnection, which can save a lot of signal lines. The application of RS-485 can be networked to form a distributed system, which allows up to 32 drivers and 32 receivers to be connected in parallel.

Extended data

The basic communication mechanism of RS485 and RS232 is the same, and its advantage lies in making up for RS232? The communication distance is short, so it is impossible to manage the network of multiple devices at the same time.

Computer communication? RS232？ RS485 converter, which is connected with several 485 devices (access controller) in turn, and communicates with the devices on the bus in turn by polling.

RS485 has the following characteristics:

1, high communication speed-up to 50mbits/s.

2. Long communication distance-up to 1200m (note: 100Kbps).

3. Differential transmission-no noise radiation

4. Multi-drivers and receivers

Baidu Encyclopedia -RS485 Communication Interface