In this diagram you can see how to install Zkteco F18 with Door lock and push button.

• Connect NC (Yellow) of F18 to +ve (Red) on Door Lock.
• Connect COM(Red) and +ve(Red) of F18 to +ve of the power supply (12v 3A)
• Connect both the -ve (Black) of F18 and -ve (Black) of Door Lock to -ve of Power supply.
• Connect BUTTON (Grey) of F18 to 1 of the connections in Push button.
• Connect the other connection on the button to -ve of Power supply.