The discrete inputs may be simple state (on/off) inputs, or may be configured for counting (total count, or frequency). There are P/DI pulse/discrete input terminals on AddMe III. The pulse inputs share terminals with the last two analog inputs on AddMe Lite.

These physical inputs correspond to BACnet AI objects starting at the object number just after the last analog input.

Type: Select State, Frequency, or Total Count. When total count is used, the total is stored to non-volatile memory (EEPROM) every 15 minutes. Raw counts or state are placed in the integer register corresponding to the input.

Invert: This applies to state input only, and simply inverts the logic state produced by the input. Normally a voltage at the input generates a binary one for data.

Slope: Slope and intercept are applied to raw counts from the integer register assigned to the input to derive the values that are placed in the corresponding floating point register. This allows conversion to virtually any engineering units (especially useful converting tachometer frequency to RPM).

Intercept: See slope comment above.

P/DI#: Enter a number or use up/down arrows to scroll through the available discrete input objects.

The AddMe Lite pulse inputs overlap the last two analog inputs. When using the pulse inputs for counting pulses, it is necessary to configure the corresponding analog input as dry contact, inverted. Pulse counting will be inhibited otherwise.