electronic terms reference

Resistor connected to output interface of the device, which is also conencted to the VCC . The resistance of resistor should be 10kOhm. In the standard no-connected output device - the interface has the VCC voltage - which equals HIGH LEVEL

Resistor, the same like pull-up resistor, but is connected to the ground. The resistor should be 10kOhm. In standard no-connected output device - the interface will have ground = 0V voltage - wich equals LOW LEVEL

The zero of the device - usually is the same as power source (-) polarity.