User's Manual

Hardware Requirement Specification

(HRS)

Orion Energy Management Doc.No: 61 8003 011

Valid from

Revision

Author(s): Jan Elfstrom Page 9/25

CONFIDENTIAL ©TIMELOX AB

5.1.7.4 The serial communication to/from the service interface shall be with

asynchronous half duplex communication (38400 8N1)

5.1.7.5 The serial communication shall be initiated with an “ACK” (0x06) from the

UI when external power is detected at the service connector

5.1.7.6 The initiation shall be complete in the interval 50 - 200ms after external

power is detected

5.1.7.7 The service device shall answer with “ACK” in the interval 0 - 200ms after

the “ACK” is transmitted

5.1.7.8 The UI shall accept a command-set implemented by AAH

5.1.7.9 The UI shall handle communication through the service connector to the

thermostat or RF module over the module communications interface

5.1.7.10 The service-connector shall be placed at the bottom of the UI (Not visible

from front)

5.1.7.11 The service-connector shall be placed such that it is easily accessible

5.1.7.12 The service-connector shall tolerate voltages in the range 3 – 10VDC

5.1.7.13 Logical high level shall be minimum 3.0V

5.1.7.14 Logical low level shall be maximum 0.5V

5.1.8 Power supply

5.1.8.1 The UI shall be possible to run off three AA 1.5V alkaline cells (3.2 – 4.5V)

5.1.8.2 The UI shall be possible to run on an external fixed +3.2 - +5V supply

(Supplied through the Module Communications Interface) from the TC

5.1.8.3 The UI shall have a maximum average current consumption of 4mA @4.5V

(not including other modules)

5.1.8.4 The UI shall have a maximum current consumption of 150mA @+4.5V (not

including other modules)

5.1.8.5 The supplied voltage shall be possible to read with a minimum resolution of

0.1V

5.1.9 Temperature sensor