Supervised Input technology is used on discrete inputs (Dry Contact) and provide indication on attempts to tamper with the wiring. There are two types in the market:
- 3 State – Identifies On, Off, Open. Will alert in case of switch removal.
- 4 State – Identifies On, Off, Open, Short. Where Open and Short are the Tamper alerts indicating removal of the switch or short-circuit to bypass the switch.
DPU3000 controllers are using the 4 State model. By default, the Supervised Input feature is disabled, to simplify installation when it is not needed. When disabled, unused inputs can be left open without any resistors installed. Supervised Input can be enabled by changing DIP#3 on switch#2 to ON (UP). From that moment, all inputs cablings need to be in compliance to the wiring rules. Unused inputs need to be “terminated” with the resistors.
Supervised Input Wiring
An input device can be any type with Dry Contact (Relay, Switch) signal. In order for it to work correctly, install the resistors right on the switch in a way that any attempt to remove the switch will remove the resistors with it. Note that the resistors are not interchangeable. See below chart on how to identify resistor value. KEYKING is supplying the resistors with the controllers, but, if needed, they can be purchased in any component store. These are standard ⅛W or higher with 5% accuracy or better.
Resistor Color Coding
To identify resistor value, use the chart above. Note that there are 2 coding types, 4 & 5 bands. They are both simple to use
Green Brown Orange in 4-Band
Green Brown Black Red in 5-Band
Brown Black Yellow in 4-Band
Brown Black Black Orange in 5-Band