It’s important to understand that the “signals” used in fire alarm systems are dc, either on or off, not ac, which carries information like video or. The resistance calculator has 1 to 6 band colors with multiplier (mul) and tolerance (tol) and ppm/kelvin. Rs485 Line Termination Resistor Calculator - Alciroorg This calculator will help you identify the value, tolerance and temperature coefficient of a color coded resistor by simply selecting the bands colors. End of line resistor calculator . So what you do is wire two sensors in parallel. V s v s = supply voltage. When you select a resistor for this purpose, choose a device with a power rating between 2 and 10 times the value calculated below in order to avoid excessive. In electronics, you’ll encounter termination resistors when you’re working with differential pair signals, such as the rs 485. Hover above the tolerance for min. Resistors are identified by the colour bands, each colour represents a different value and th...