CCTV cameras use 5.5mm x 2.1mm or 5.5mm x 2.5mm DC barrel plugs for 12V power supply connections, with the center pin po

Digital security keypads connect to alarm panels via RS-485 4-wire or 2-wire buses for PIN code entry remote arming and

External siren and strobe connectors use 4-wire connections for tamper circuit, strobe power, and siren power, with sepa

4-wire conventional smoke detectors use separate power and alarm circuits allowing detectors to be reset from the panel

Glass break acoustic detectors use a 4-wire connection for power, ground, and relay output to signal when glass breakage

Passive Infrared (PIR) motion detectors use a 3 or 4-wire connection for power, ground, tamper, and relay output to conn

Electric door strikes replace the fixed strike plate with a motorized version that releases when powered, allowing doors

Electromagnetic door locks (maglocks) use a 2-wire connection for 12V or 24V DC power that magnetizes the armature plate

Wiegand 26-bit protocol is the standard for access control card readers connecting to access control panels using 4-wire

PTZ (Pan-Tilt-Zoom) cameras use RS-485 2-wire half-duplex terminal connections for receiving Pelco-D or Pelco-P control