User's Manual

Hardware Requirement Specification

(HRS)

Orion Energy Management Doc.No: 61 8003 011

Valid from

Revision

Author(s): Jan Elfstrom Page 17/25

CONFIDENTIAL ©TIMELOX AB

5.2.12 Real Time Clock (RTC)

5.2.12.1 A RTC shall be designed based on a standard low power 32kHz crystal

5.2.12.2 The RTC function can be an internal MCU timer clocked by the low power

crystal

5.2.12.3 Maximum time deviation over a year shall be +/-15 minutes

5.2.12.4 The minimum resolution shall be one minute

5.2.12.5 The real time shall be an incremental number with the length of four bytes

5.2.12.6 The start time for the real-time count (0) shall be 1996-07-20 00:00

5.2.12.7 No support for day-light saving shall exist

5.2.13 Counters

5.2.13.1 Counter for total HVAC run time [32-bit value, minute resolution]

5.2.13.2 Counter for HVAC run time maintaining the guest set-point (starts when

guest set-point is first reached from set-back) [32-bit value, minute resolution]

5.2.13.3 Counter for total HVAC run time in unoccupied and unsold set-back

including recovery time from setback to set point [32-bit value, minute resolution]

5.2.13.4 Counter for total occupancy time [32-bit value, minute resolution]

5.2.13.5 Three maintenance run time parameters [32-bit value, minute resolution]

• tlmMaintenanceCounter1

• tlmMaintenanceCounter2

• tlmMaintenanceCounter3