I  worked for the home and building control division of Honeywell india  during the years 1998-99. I was involved in several projects (three to be precise). Most of my work involved designing firmware for embbeded  devices like the Wall  module unit and the Human Interface panel.  A brief description of each  of the projects is given below
 
 

Project : "WALLY-2 , Digital display wall unit module"

Description:  Enhancing the display and schedule functionality of a device called "WALLY-2". The device consists of a neuron chip with an on-chip ROM. The neuron chip implements a protocol called LONTALK which is used by the controllers to  communicate over the echelon bus (similar to a 1 persistent  CSMA/CD protocol). WALLY-2  functions  as a monitoring node on the controller network and would enable the user to set controller paramters such as humidity, temperature , gas concentration etc.  New display functionality was added and the device was made capable of handling schedules, which would provide an automatic way to  schedule the activities of the controllers such as CVAHU (constant volume air handling unit), UV(Unit ventilator), SBC (small building controller).
 
 
 

Project : "Human Interface Panel", a man machine interface for a small building system

Description:  The HIP is designed to function as a man machine interface for a small building system ,consisting of a network of controllers . The HIP uses a Motorola microcontroller (MCU  68HC11) as the host processor and the neuron chip as the communications processor . The two processors communicate via a MIP (Microprocessor Interface program). The HIP uses a RTOS , which in this case is a non preemptive multitaskiing kernel.  The device is  provides the following functions :
 

•    View/Modify controller parameters
•    View/Modify controller schedules
•    Display list of  all active devices in the network of controllers
•    Display alarms log which is obtained via file transfer from the small building controller.
•    It can be commisioned (intialized) using a PC based configuring tool called LONSPEC (developed at Honeywell )