FOR Tstat5 LCD type
//rev 38.1
//cc 02-11-2014 fixed in manual mode, on power on stage, relay5 does not work properly bug : RELAY_1TO5 = 0xff  
//cc 12-05-2013 add ID auto lock/unlock function

//38.0
//cc 11-18-2013 fixed digital manual input function

//37.9
//cc 10-28-2013 modify output formula of analog output2 when no airflow sensor present
//cc 10-28-2013 modify responseData() routine to reduce ROM

//37.8
//cc  10-21-2013 add PID3 input select function, AI1 to AI8 can be PID3 input
//cc  10-21-2013 add PID3 off table

//37.7 
//cc 10-18-2013 add no airflow sensor function
//cc 10-11-2013 add pid3 to control airflow
//cc 10-09-2013 add dual max vav reheat function

//37.6 for SANJAY(PM5E SIGEMA)
//cc 09-26-2013 fixed after change to auto mode it back to manual mode problem
//cc 09-26-2013 fixed heat hysterisis display error
//cc 09-26-2013 fixed when hysterisis saving problem

//37.6
//cc 09-22-2013 modify registers list so can be compatible with Tstat_AP product.
//cc 09-22-2013 change serial number write method, after firmware flash/update, the serianl number can not be written   
//37.5
//cc 09-05-2013 fixed register lock function
//cc 09-04-2013 modify customer table for inputs, any input can be set to use customer sensor, but only two channels can be use at the same time. 
//cc 09-04-2013 modify pid2 selection, now can set any input as PID2 input 

//37.4
//cc 08-30-2013 when receive broadcast write command, not response, reduce write error.
//cc 08-20-2013 
//fixed when changing system to auto mode, it not triggered occupied bug
//cc 08-20-2013 add ID write protect register to avoid change ID by wrong.

//37.3 for SANJAY 
//cc 08-05-2013 fixed heating problem 

//37.2 for SANJAY 
//cc 07-02-2013 creat new branch for Sanjay project
//cc add new menu system
//modify default output table
//modify default sequence 

//37.2
//cc 06-08-2013 add new keypad type -4C, fan down key modify to adjust out1 output table (on-off-cycle) on costing mode
//and fan up key modify to adjust fan speed (off-heat-cool-gas-auto) 

//37.1 
//cc fixed when input1 is selected as PID2 input, the value not give to analog_input[0] .
//cc fixed bug that when update multiple units, ID and product model will be changed.  
//cc 06-04-2013 modify system sequency, add additional options sequency-2,sequency-3,sequency-4, use sequency-2 as default option and keep old factory default as sequency-1

//37.0
//cc 05-31-2013 remove test_pin, it will cause red LED flashing
//cc 05-31-2013 modify checkdata routine to solve T3000 can not scan multiple untis problem(scan command not support well before )
//cc 05-21-2013 modify filter for each single analog input, set factory default value to 3


//36.9
//cc 03-28-2013 fixed decima blink function
//cc 03-28-2013 add writing record test code to check which register will be written by wrong
//cc 03-27-2013 modify relay pwm function, changed desire_time[], make sure it not overlap
//cc 03-26-2013 modify digital input and digital interlock function, if define digital input, use reg546 to set the digital range on/off or off on 
//cc 03-22-2013 merge Tstat_AP with normal Tstat5_LCD code
//modify keypad and display function
//modify input function
//modify modbus register address

//36.8
//cc 03-06-2013 fixed temperature definition error in serail.c file
//cc 02-25-2013 modify LCD rotate display function

//36.7
//cc 01-19-2013 fixed after re-initial LCD, the DAY ICON will lost bug.
//cc 01-16-2013 fixed GREEND LED, when system in coastingmode, it will turn on.
//cc 11-23-2012 fixed sun/moon icon disappeared bug after reset LCD for Paul and Runar

//36.6
//cc 11-19-2012 add new register to detect if register101 and register217 have been written by accident, each time do the write operation, the value in relative register will increase one
//cc 11-12-2012 add LCD refresh function every 5 minutes for Runar
//cc 10-17-2012 fixed i2c may not stop properly problem.


//36.5
//cc 09-13-2012 take back setpoint() code
//cc 09-13-2012 blank code in check_range() function to allow user adjust Pterm to any samll value
//cc 09-12-2012 change eeprom initial function, set default state of info_byte, make sure ID not lock after back to factory default
//cc 09-12-2012 fix bug when initial eeprom sometimes will lock the ID
//cc 09-12-2012 add code to clear up the eeprom when version update
//cc 09-07-2012 delete office mode in occupied mode, keep office mode in unoccupied mode to be compatible with previous version 
//cc 09-07-2012 merge 36.1 and 36.2 with 36.4
//cc 09-07-2012 add universal output off table and valve table(done by Robert, not noted in the reversion file)



//36.4
//cc 09-07-2012 delete office mode in occupied mode, keep office mode in unoccupied mode to be compatible with previous version 
//cc 09-06-2012 change LCD display item number to 0: only display temperature when firmware version update or new eeprom 
//cc 09-06-2012 36.3 not used any more
//cc 09-06-2012 remove 36.2 and 36.1 change, back it to 35.7 
//TBD£º add new setpoint group and compatible with old version

//36.3
//cc 08-08-2012 change night setpoint default value, now can use two bytes to store it
//cc 08-08-2012 merge 36.1 and 36.2 function, include window interlock, LCD rotate display function
//cc 08-02-2012 change setpoint_mode to day_setpoint_mode and night_setpoint_mode
//cc 08-02-2012 get rid of hotel and office mode and re-write setpoint formula

//36.2
//cc 06-19-2012 change window interlock function, when it is triggered, system not go into unoccupied mode
//cc 06-20-2012	 change setpoint display when window interlock is triggered

rev36_1_lcd: make compatible with new and old pic protocol.
rev35_9_lcd:
route display .

//35.8
//fixed rotate display function, now can rotate display 12 items
//fixed user information display function, user can set their owm name
//change multuple write registers function, max 16 bytes each time
//cc 4-13-2012 fixed heating deadband when ocuupied  office mode

//REV 35.7
//mhf   03-19-2012
//Added shutdown interlock for all outputs and each input can be set as shutdown interlock
//REV 35.6
//mhf   03-07-2012
//Added window interlock feature
//Fixed problem turn wheel quickly will cause display crashed
//Checked and found already ni filter for digital input
//REV 35.5
//cc   12-20-2011 
//Fixed in occupied mode,can not enter heating mode bug.
//Fixed can not change device ID bug

//REV 35.4
//cc   11-25-2011 
//add eeprom read/write check routine, when read eeprom, read twice and compare the result to avoid interrupt error;
//when write eeprom, read it first and compare with target value, check if need change.
                                      
//MHF 11-25-2011
//Read E2 routine,when ever read ,will send full command to E2,from start signal,device address,data address
//Short code in serial interrupt
//Add stop signal in give_pic_ack routine in PIC.c

//REV 35.3
//MHF 08-23-2011   Put analog output in one routine


//REV 35.2  07-04-2011 BY CHARLEY : disable ALE pin to reduce EMI

//REV 35.2
//MHF 06-27-2011    Recover heating register writable,added a new register 422 use for cooling setpoint,
//					register 135 is middle setpoint.Added anew register 423 for day setpoint option,
//					1 = hotel and 0 = office.default is hotel mode.
//				  Bit6 	of register 184 (base bit is 0)used for write device ID disable/enable.0 = enable
//				  1 = disable,can not change device ID ,defualt is enable.

//REV 35.1
//MHF 06-11-2011    Any output can be configured as PWM output
//					OUTPTU 6&7 be set at ON/OFF,OFF/ON,will put it in relay_routine function.
//					FIlter change to zero when input range is ON/OFF or OFF/ON


//REV 35.0
//cc cc 06-14-2011  add deadmaster function
//cc cc 06-14-2011  change output manual output to register108, combine to one byte
//MHF 05-23-2011    Fixed analog output code,any analog output can be set as cooling output or heating output
//		     Housekeeping: Renamed some parameters in the source code for clarity

//              Put output6 and 7 into same routine as outputs 1 thru 5 when they are configured as ON/OFF or OFF/ON
//		FIxed a bug,the LCD gets stuck in firmware notice, doesnt jump to normal display routine


//REV 34.9
//MHF 04-20-2011    Filter bad pic readings (again), fixed a bug in this routine
//                  Fixed floating mode code here, was missing some code from earlier versions. 
//                  PM_5E and Tstat5E can use the same code,no need to use defines
 
 
//REV 34.8
//MHF 02-17-2011    Added outdoor air feature 
//add a new register 421 use to turn all fan off, 0 = turn off all fan icons, 1 = turn on fan icons.
//fixed write register 184 will cause timeout problem,bit 5 of register 184 use to enable/disable RS485 .
//But the register 184 also use for other features,other feature s will set bit5 of register 184 and cause communication problem.
//Fixed it.
//added a new define 5E_NEW for new version Tstat5E with new PIC

//REV 34.7
//MHF 02-12-2011    Stop reset all parameters when change the units from c to f or back
//					Added a routine do the parameter convertation when Degree_C and Degree_F units changed

//REV 34.6      	Redefine b.eeprom parameters to make the code easy to look through     
//REV 34.5			Redefine b.eeprom parameters to make the code easy to look through 

//REV 34.4
//MHF 01-17-2011  Use pwm control led to dim led 
//REV 34.3
//MHF 01-02-2011  add a bit to disable rs485 for wireless tstat
//REV 34.2
//MHF 12-02-2010  Read multiple pic version when power up to avoid pic error display on LCD.


//REV 34.1

//MHF 09-21-2010  Fixed a bug,the valve time be fixed 250 second,it is wrong,it should user adjustable 

//from 10 to 255 seconds.The defualt time has been changed to 90 seconds,before it was 25 seconds.

//Improve floating valve code to separate it from the PID math and feed PID result to output table properly

//Add feature to let us put the floating valve into manual mode by writing MAN to bit 310.7 and valve percent to register 285


//REV 34.0
//MHF 09-06-2010  Changed pins define for LED and knob button to match latest hardware rev4.
//MHF 09-10-2010  Get rid of AI1,AI2 information from menu.

//REV 33.9
//MHF 08-17-2010  Added LCD sleep feature for Tstat 5E,write 6 to register 203.
//Fixed knob clockwise,make it more accurate,also changed schematic, will use external interrupt
//capture pulse to improve accurate.
//Fan icon will go OFF in off mode

//REV 33.8
//MHF 06-21-2010  Add a flag make sure serial port communication 

//no pic communication

//REV 33.7
//MHF 02-24-2010  Fixed filter arithmatic
//REV 33.6
//MHF 01-21-2010  Sixth bit of info byte used for response delay,0 = right away respond,1 = 10ms delay

//REV 33.5
//MHF 11-05-2009  Add one more screen shows parameters,ther eare two screens show parameters now and display rotatly.
//				  Register 400 use for assign the first screen parameter,register 401 correspond to screen 2.
//				  0 = close current screen,1= temperature,2=setpoint,3= input1,4=input2 and so on.
//				  the units for input 1 through 8 decided by the corresponding range setting.For now we support ON/FF
//				  celsius,Fahrenheit,percentage.
//				  Added register 402 for DAY icon control,403 for NIGHT icon control.0 = AUTO,1= OFF,2 = ON	

//REV 33.4
//MHF 08-18-2009  Add a register 14 for customer, store random data ,range is 0 through 255
//REV 33.3
//MHF 06-18-2009  Add PWM feature for 5E,borrow the  code from 5D .

//REV 33.2
//MHF 06-03-2009  5E has no digital input,so use analog input 3 instead of .

//REV 33.1
//MHF 04-01-2009  Fix analog input1 range bug.


//REV 33.0
//MHF 03-09-2009  Use register 188 ,189 store input 1 and 2 range information for compatible with Tstat 5c,d.

//REV 32.9
//MHF 02-18-2009  Fixed LCD showing when power up.Now only shows VER XXX in first line and second line shows ADDR XXX.

//REV 32.8
//MHF 01-12-2009  Add a register for LCD backlight turn off.

//REV 32.7
//MHF 11-25-2008 Changed display as LCD

//REV 32.6
//MHF 07-23-2007 Added default setpoint feature,added two register .One for default setpoint and another for setpoint control.

//REV 32.5
//MHF 07-23-2007 Fixed interlock timer bug,The timer_flag should be set according to interlock set.

//REV 32.4
//MHF 07-20-2007 Fixed the bug the relay with interlock will turn off after change the detpoint via serial port

//REV 32.3
//MHF 07-18-2007  Fixed factory default ,now read data from flash when write 143 to register16.
//				  Keep the c/f degree after write 143 to register 16,before fixed degree c. 
//				  Added a new keypad mode 6C for tstat with six buttons
//REV 32.2
//MHF 07-04-2007  Fixed the temp flickering bug
//				  Fixed the bug the tstat is unusable after loaded configuration file
//				  Use gridpoint's output table as default output table after updated new firmware

//REV 32.1
//MHF 07-03-2007 I Fixed the pid math in the attached hex file to resolve the flick bug.

//REV 31.9
//MHF 06-13-2007 Fixed the initilization when HC mode is keypad.

//REV 31.8
//MHF 06-12-2007 Fixed timer interlock

//REV 31.7
//MHF 06-06-2007 Get rid of the limitation for cooling deadband and heating deadband.

//REV 31.6
//MHF 05-24-2007 The tstat will take effect after the button be released
//				 Fixed the bug the menu still on even do not operate it in 5 seconds 
//			     The hold LED will turn on you press the up and down temp button simultaneously 5 seconds.
//				 Added a timer for interlock output.Please configure the following registers before you use this feature.
//REV 31.5
//MHF 05-15-2007 Delay the button take effect after be pressed
//				 Short the time enter or and exit HOLD mode
//				 Make sure the HOLD  mode take effect after the button be released

//REV 31.4
//MHF 04-29-2007  Fixed issues about C/F converting

//REV 31.3
//MHF 04-25-2007  Fixed the setpoint bug when change the C to F or back.
// 				  Keep  the SOP and C/F  same with configuration file when the users go to FAC at keypad.
 
//REV 31.2
//MHF 04-10-2007  Keep the value of UTIL register when change C to F or back.

//REV 31.1
//MHF 04-06-2007  Added a limitation to make sure the tstat not go to EMER mode when register 118 = 3.
//				  Changed the e2 chip read routine and serial port communication routine for fixing the read error bug.
 
//REV 31.0
//MHF 04-05-2007  Fixed e2 chip read routine

//REV 30.9
//MHF 04-03-2007  Fixed nothing except version number,Checked a new version number will erase E2 chip.

//REV 30.8
//MHF 03-29-2007  Fixed  the two configuration files not match between before load  and after loaded

//REV 30.7
//MHF 03-28-2007  Fixed bug that registet 310 can not show the right value.
//				  Fixed the bug the cool and heat mode can not switch if be changed from serail port.

//REV 30.6
//MHF 03-26-2007  The SOP has only two values can be selected,1 and 3.
// 				  The register 321 and 322 can be write and read,before the  wo register are read only.
//  			  Added a new register 326  for e2 chip type,0 = old and small e2 chip,1 = new and big e2 chip.

//REV 30.4
//MHF 03-20-2007  Added two register for address limitation for gridpoint,Added sop == 3 item to use two config

//REV 30.3
//MHF 03-19-2007  Fixed the C/F converter bug.

//REV 30.2
//MHF 03-16-2007  Fixed the bugs about util can not read by serial port,hold can not exit from kepad

//REV 30.1
//MHF 03-14-2007  Added FAC item in the gridpoint  menu.deleted two register 321 and 322 used in util mode.
//				  Added a register 323 for hold mode,write and  read.Fixed a bug in mode transition.

//REV 30.0
//MHF 03-14-2007  Added advanced  menu for grispoint.added util mode and hold mode.

//REV 29.9
//MHF 03-08-2007  Fixed the mode register 106 to show coasting when the mode be set OFF by using keypad

//REV 29.8
//MHF 03-07-2007  Added two register 321 322 to show fan mode and work mode;fixed the LED to show the work mode
//				  immediately when the user adjut the mode using button	

//REV 29.7
//MHF 03-06-2007  Fixed the right lower button use for decrease setpoint

//REV 29.6
//MHF 03-05-2007  Fixed the write and read routine for e2 chip 24c08

//REV 29.5
//MHF 02-28-2007  Fixed the min and max address register address,fixed the button function,fixed the write and read routin for e2 chip 24c08 
//REV 29.4
//MHF 02-01-2007  Fixed the  pid arithmetic.The coasting is not as a stage number when caculte pid's switching point
//                just use cooling stage number plus heating stage number to caculte switching point.
//				  Fixed the analog output state to corespond to the T3000.the analog output 0-100% = 2,
//				  50 - 100% = 3 ,100% = 1.

//REV 29.3
//MHF 02-01-2007  Clear the MSB 4 bits of register 184; Fixed the formula caculating the cooling stage value

//REV 29.2
//MHF 01-30-2007  Make sure the cooling deadband and heating deadband less than the cooling_pterm/2.				   

//REV 29.1
//MHF 01-26-2007  Fixed the PI's algorithm  

//REV 29.0
//MHF 01-19-2007  Added a new range OFF/ON for each input.Fixed the part use DI1 for interlock
//				  In auomode,the register 311 will show the state of DI1

//REV 28.9
//MHF 12-20-2006 In occupied mode,the tstat will go to unocuupied mode after the duration override timer time
//				 if the occupancy sensor input changed.The tstat also go to unoccupied mode after the duration when power up and 
//				 the fan speed bigger than zero. 
   
//REV 28.8
//MHF 12-09-2006 Fixed the occupied bit make sure the bit can show the right status.

//REV 28.7
//MHF 12-05-2006 Fixed occupency sensor mode.In office mode,the tstat will go to occupied mode when the input changing

//MHF 11-30-2006 Changed the resolution of valve travel time from 0.1 second to 1 second.

//MHF 11-30-2006 Added the averaging sensor feature. A new function setting for a temperature sensor input, it
//				 can be assigned to average with the internal sensor and external sensor then feed back to the PID. 
 
//REV 28.6
//MHF 11-21-2006 Delay the tomeout for serila port receive and reset the watch dog when reply mutiple write 
//				 	

//MHF 11-21-2006 Added three functions for analog1,2 input,move the function in register 190 to register 300.
//				 the register 190 only use for digital range.Expanded the digital input function in menu and the parameter 
//				 be stored into register 300.

//REV 28.5

//MHF 11-07-2006 added a 10 second delay when the mode of operation is decreased

//REV 28.4

//MHF 10-26-2006 Initilize the pidoutput array to determine the digital output controlled by which output table.
 
//REV 28.3

//MHF 10-25-2006 Fixed PID2 bug.Can not get the right pid to control the output when the user select min and max funtion in pid control
 
//MHF 09-30-2006 Adjust the involatile data structure because the data has extended the size of E2 chip  

//REV 28.2

//MHF 09-26-2006 Fixed the pid bug .The Pid will get wrong value as temperature nearby setpoint if set the cool statge equals to zero
 
//REV 28.1

//MHF 09-15-2006 Fixed the code of PID2 part.the PID2 also can work  if the range of corresponding inputs is 10K thermistor .
//				 Before the PID2 work only when the range of inputs is customer sensor.

//rev28.1        Added sendZero() routine to reduce code space, used by several routines.


//REV 28.0
//MHF 08-23-2006 Added register 317 to store the value which determine how long time the Tstat will go occupied mode 
//				 after power on and see no serial communication.The value range of the registeris 0 to 255 and the units is minute.
//				 If 0 is assigne din the register means that disable dead mater feature.

//MHF 08-28-2006 Added register 318 for rounding display.There are three possible settings. 0 means round off the display to the neares digit.
//				 1 means round to the nearest 1/10 unit, this is the default;5 means round to the nearest 1/2 unit.

//MHF 08-29-2006 Fixed keypad press counter feature.Counting up the value of register 294 from 1 instead of from 0 after any combination of 
//				 keys is pressed twice.

//

//REV 27.9
//MHF 6-25-2006  Added config tool feature.The tstat will transfer the configuration itself to another tstat by pressing 
//			     the lower right button.we realized this feature by a define predefine comamnd.So if the user need this 
//				 feature ,they have to tell us before we programm tstat.

//MHF 7-12-2006  Fixed the keypad 2A mode.Before the user hit the button only one time the tstat will from unoccuipied mode
//				 to occupied mode. And the fan speed also from OFF to AUTO.Later we fixed that,from unoccupied mode to  
//				 occpied mode,the user can ajust the fan speed but not just fixed AUTO mode.But this conflict with keypad mode 
//				 2A,because 2A mode can not change the fan speed.So now at 2A mode.From unocucpied mode to occupied mode,the 
//				 fan speed is fixed AUTO.At others keypad mode,from unoccupied mode to occupied mode ,the user can changre the 
//				 fan speed.	

//MHF 07-24-2006 Added five register to operate relays when the corresond relay is set to manu mode.
//				 1,open the relay;0,close the relay.

//MHF 07-26-2006 Added a register 15 to select the base address.0,Protocol Address.1,PLC Address

//MHF 08-17-2006 Fixed a bug that the Tstat can not go to Cooling stage3 in some cases.

//REV 27.8
//MHF 7-12-2006  Fixed the occupancy sensor feature for ShragaThere are two modes about using the feature.
//				 one mode is in office mode  and another mode is in hotel mode.Now we have only way to change the 
//			 	 tstat go to occupied mode ,that is write 1 to register 184.Before the tstat go to occupied mode ifthe user 
//				 change the fan speed from 0 to a value bigger than 0.Now we change the fan speed whatever mfrom keypad or 
//				 serial port,tstat will reset the override timer.

//REV 27.7
//MHF 4-27-2006  Added a function item for each input.the function include "normal","freeze protect","occupancy sensor"

//MHF 4-27-2006  Added auto/manu control bit for each input and output

//REV 27.6
//MHF 3-27-2006  Added freeze protect feature

//MHF 3-27-2006  Added timer ON feature,The corespond relay will turn on several minutes after TSTAT run some time

//REV27.5

//MHF 03-01-2006 Changed the value range of filter .The filter can be set from 0 to 100.
//RL:06-02-16	update documents for hotel/office deadband.  document information were flipped.  Office is setpoint.  Hotel is Deadband

//REV27.4
//RL:06-02-09  added LED table option Stage_1-2-3 and Stage_2-3

//MHF: 06-02-14	added fan speed change for Kevin in keypad 2B settings

//REV27.3
//MHF:06-01-20  Fixed trigger override timer mode ,any key be pressed the Tstat enter override timer mode

//REV27.2
//MHF:06-01-20  Fixed the tempetature display mode on LEDs

//REV27.1
//MHF:06-01-20  Clear item zero when the temperature in deadband area

//REV27-0
//RL:06-01-05	removed EA=0 lines from the pic read function.  reduced flicker to the display
//				note that pic was left unchanged.  May be possible that there are less pic reads
//				in the future may observe pic reads not as fast...
//RL:06-01-06	placed back the code which now only enables writing to hardware-rev and Product-Model only once


//REV26.9
//MHF:12-26-05  Fixed pid algorithm.change the pid_error arithmetic when at coating
//				mode to make iterm decrease and increase fast

//MHF:12-27-05  Fixed the protocol of scan.Now read and write register 10 not Modbus protocol.
//				Because added serialnumber data in the data packet

//MHF:12-29-05  Fixed occupied_trigger_handler() and related to make bit3 ofregister 184 can show 
// 				Digital input1 status at any time and any case	

//REV26.8
//MHF:11-14-05  fixed pid bug .expanded pterm greater than night_cooling_db + night_heating_db

//ron:11-14-05	added flash_info function at code 0x100

//MHF:11-24-05  Added a register for last key pressed timer

//MHF:12-15-05  Added serialnumber data when reply modbus function 25

//REV26.7

//MHF 10/25/05	Fixed the value range of 107 MODBUS_MODE_OPERATION register  for compatible backward.Now use the following value:		   	
//				coasting 0  cooling1 1  cooling2 2  cooling3 3  cooling4 14  cooling5 15  cooling6 16

//				coasting 0  heating1 4  heating2 5  heating3 6  heating4 17  heating5 18  heating6 19

//MHF:10/28/05 Fixed pid bug ,the PID was winding up past 100, taking too long to wind down. 
//             Also in the deadband region, made sure the I term can decay but will not incease. 

//MHF:10/28/05 Added 0---50% item for output table to determin how much the valve open.now the EEP_VALVE_OPER_TABLE_BEGIN register every bit is defined  like this:
//             7 : '0' heating valve(output7)not select 0---50% ;  '1' heating valve(output7)select 0-----50%  
//             6 : '0' cooling valve(output6)not select 0---50% ;  '1' cooling valve(output6)select 0-----50%  
//             5  4  :  floating valve ,the range of valve open
//             3  2  :  heating valve(output7), the range of valve open
//             1  0  :  cooling valve(output6),the range of valve open

//MHF:10/31/05 After a load of the configuration file or new hex file of the same rev number, the occupied state is left unchanged. 
//                                 (if the hex file is a major update requiring the flash to be erased, 
//                                   then the occupied stat is lost after a hex file s sent. )
//             changed file :serial.c 
//			   fixed some code when POM == 1,	in this mode,only when fan_speed_usee ==0 do something
//             changed file :tstat.c 

//MHF:11-07-05 when tstat at unoccupied status ,recaculate cooling_db and heating_db to make PID work correctly
// 			   changed setpoint() and update_pid() function

//MHF:11-09-05 Fixed calibration bug which if  TSS = 0,could not calibrate

//MHF:11-10-05 Fixed LED status,turn all leds off except OFF led when the tstat working in the OFF mode, the left vertical row of status leds.

//MHF:11-11-05 Fixed occupied status in REG184,if the fan speed goes greater than 0 from the keypad, then the occupied bit goes to 1 (TRUE)
//                                             if Fan speed goes to zero from the keypad, the occupied bit is 0 (False). 
//                                             at night, if the fan goes on to maintain the night setpoint, 
//                                             then the occupied bit stays at 0.
// 
	   			
//MHF:11-11-05  limit TSS less than 2 if the tstat is 5A or 5B  ,because the tstat 5A and 5B only have 
//				temperature chip and external thermostor

//REV26.6

//MHF 9/23/05 Add DDC mode in AUTO_ONLY regiser to make the user can not change setpoint and ON/OFF mode from keypad.
//	      	  The user only can change these things from serial port.

//MHF 9/23/05  Add interlock for each output.Add seven registers 285 to 293 to store the interlock, connected to inputs only (for now). 

//MHF 9/27/05  Added a new register to adjust the setpoint increment as a user variable. We store it as a user defined variable 
//			   in a one byte register, minimum value is 0.1, the maximum value could be set at 1.0.Now cooling setpoitn and 
//				heatinng setpoint are stored in the E2 chip by using two bytes.Whatever the setpoint be set by keypad or serial port 
//             the setpoint value should multiply 10.

//MHF 9/28/05  Tss register is left unchanged when the user changes C to F or  F to C.

//MHF 9/28/05  Added a new item DEF which store current configuration  into flash as new default in the menu

//MHF 10/5/05  Tstat displays "---" when the tstat can not detect the pic chip though there is a pic chip
 
//MHF:10/24/05 if the tstat is working on OFF mode,turn off cool and heat LED, lower row of status leds. 


//REV26.5

//MHF 9/6/05 shorten the delay between chatacters when tstat response .the tstat response should have a pause between two characrers,
//           but the maximum allowed pause is 1.5 character times or .83 ms * 1.5 or 1.245 ms at 9600 baud.

//MHF 9/21/05 The baudrate does not change after changed C to F or back.

//MHF 9/22/05 Fixed bug in TSS register.Because the TSS can not be set to zero even that the tstat has internal teperature
//			  sensor when update the tstat's software from before revision 26.4  to after revision 26.4 .

//REV26.4

//MHF 8/18/05  Added "floating valve" feature.Added five  registers from 280 to 284 to determine relay1 to relay5 output mode.
//			   Relay 4 and relay5 be used to control valve by pulse mode if MODE_OUTPUT4 AND MODE_OUTPUT5 be set '1'.
//			   in this mode,the relays not be controled by PWM.

//REV26.3

//MHF  8/18/05 fixed the original PID's Pterm = cooling_db+heating_db+10 to avoid always staying coasting mode
//             because of  the user set the Pterm less than cooling_db plus heating_db

//REV26.2

//MHF 7/12/05 Added PWM to pin ENABLE_2003, for decrease the current by using pulse control relays.

// TODO allow writes to registers 180, 181, 215, 216 - automatically adjust calibration values when writing to these registers.

//REV26.1

// MDF 6/23/05 Fixed bug in EEP location of UPDATE_STATUS register..
//		tstat.c, serial.c, define.h

// MDF 6/30/05 Got rid of LED_Init_table and function.  LED defaults now stored same as the rest of the b.eeprom registers.
//		tstat.c, serial.c, define.h

// MDF 6/30/05	Set Flash-stored address to 0 whenever writing to EEPROM-stored address.  This invalidates the address stored in Flash.
//		tstat.c, serial1.c

// MDF 6/30/05	Reset factory defaults to 0 at startup.
//		tstat.c	

// MDF 6/30/05	Added a prevention measure so that 0 or 255 cannot be written to the address.
//		serial.c

// tbd... ask ron about the address initialisation... i wanna add some code but doesn't seem to work out...


//REV25.7

// MDF 4/30/05	Added MODBUS_OVERRIDE_TIMER_LEFT to hold the remaining value on the override timer.
//		serial1.c	

// MDF 4/30/05	Implemented display blank option by setting MODBUS_DISPLAY = 2.
//		display.c	

// MDF 5/01/05	Created calibration terms for both the Analog In2 and for the Internal Thermistor .
//		modbus.h, define.h, tstat.c, serial1.c, output.c

// MDF 5/01/05	Created registers to show the internal temperature sensor IC and the internal thermistor value at all times.
//		modbus.h, define.h, serial1.c,	

// MDF 5/01/05	Combined CAL and CAE into one menu item, making it automatically adjust the correct calibration term based on the TSS..
//		LibDisplay.h, tstat.c	

// MDF 5/19/05	Fixed bug. 5Bs were not reading the temperature chip because they do not have analog inputs..
//		output.c

// MDF 5/24/05	Fixed bug in filtering algorithm..
//		output.c, temperature.c

// MHF 5/25/05	Added partial menu lock..
//		tstat.c

// MDF 5/30/05	Fixed bug in calibration implementation regarding degrees F.
//		tstat.c, serial1.c

// MDF 6/3/05	Set Flash-stored address to 0 whenever writing to EEPROM-stored address.  This invalidates the address stored in Flash.
//		output.c, temperature.c

//REV25.6

// MDF 4/19/05	Adjusted HC setting so that when the external sensor is hotter, we are in heating mode, not cooling mode..
//		control_logic.c	

// MDF 4/20/05	Rearraged location of many RAM variables to free up space in the data memory.
//		control_logic.c	

// MDF 4/20/05	Gave serial interrupt priority to reduce communication errors
//		tstat.c	

// MDF 4/25/05	Added a prevention measure so that 0 or 255 cannot be written to the address.
//		serial.c	

// MDF 4/28/05	Reset factory defaults to 0 at startup.
//		tstat.c	

// MDF 4/28/05	Fixed factory defaults bug when setting defaults from keypad.
//		tstat.c	

//REV25.5

// MDF 4/05/05	Made TEMPERATURE FILTER a variable rather than a constant.  Set up new menu item, FIL, to control this variable.
//		serial1.c, tstat.c, LibDisplay.h, Temco.h, define.h, temperature.c			

// MDF 4/07/05	Added support for the Tstat5B2
//		tstat.c			

// MDF 4/08/05	Change plug_n_play address to register 10.
//		modbus.h			

// MDF 4/14/05	Fixed bug that caused the iterm to rollover from a positive to a negative number.
//		PID.c	

// MDF 4/14/05	Adjusted filter so that the temperature does not jump when the new reading is very different.
//		temperature.c	

// REV25.4

// RL	03/25/05	update_status missing in the ISP update routine in Ver25.3
//					update_status variable was missing when writting through modbus, therefore no update was possible given Tstat did not reset

// MDF 4/01/05	Fixed bug in check hardware and model regarding 5A with rev0 hardware
//		tstat.c, 				

// MDF 4/01/05	Made change to auto_plug_and_play check_data() routine. Now tstat will not respond if randval != 1;
//		serial1.c, 

//REV25.2

// MDF 1/27/05	Fixed bug in PID.
//		pid.c,

// MDF 1/28/05	Fixed bug that prevented tstat from jumping into ISP mode..
//		serial.c, 

// MDF 3/23/05	Changed PID so that iterm will continue to influence the tstat even when the temperature is between the deadbands
//		pid.c, 


//REV25.1


// MDF 12/30/04 Changed the function of occupied/unoccupied.  It no longer has a correlation to fan speed. The mode can
//				only be changed by the digital input or by a command from the modbus.
// 		tstat.c, keypad.c, serial.c 

// MDF 1/6/05	If there is an E2 error, the tstat no longer freezes.  instead it simply does not start up any of the timers.
// 				the serial communications will still work.  This is to allow you to adjust the 
//				product model and hardware rev registers
//		tstat.c

// MDF 1/11/05	Added 2 more button configurations - 2b and 4b.  2b is the same as 2, except cooling and heating mode
//				can only be controlled via the serial interface.  In 4b, the lower left button switches between cooling 
//				and heating mode, while the lower right button scrolls through the fan speeds - off, 1, 2, 3, auto.
//		tstat.c, serial.c, control_logic.c, temco.h

// MDF 1/14/05	Implemented blinking display whenever setpoint or fan speed is changed via the serial interface.
//		serial.c, 


//REV25.0

// MDF 7/14/04 Added display_integer() to show integers better in the menu
//		tstat.c

// MDF 8/2/04 analog input is now raw the look_up_table now gets applied when checking temperature
//		output.c, pic.c

// MDF 8/4/04 Added code to display setpoint instead of temperature according to menu item, dIS
//		temperature.c, temperature.h, define.h, modbus.h, serial1.c

// MDF 8/4/02 added code to check for an analog module on Tstat5C boards
//		tstat.c

// MDF 8/5/04 Added code to allow tstat5c to do analog out functions
//		output.c

// MDF 8/5/04 Changed extern_operation_default table so that OUT4 and OUT5 correspond to table.
// 		Temco.h, Output.c

// MDF 8/5/04 Added code so that an Analog Tstat can fuction as ON/OFF
//		output.c

// MDF 8/16/04 Added code to automatically switch between displays depending on the 
//		hardware revision.
//		tstat.c, libdisplay.h

// MDF 8/17/04 Setup PRODUCT_MODEL and HARDWARE_REV registers to keep track of 
//		the hardware and model.
//		tstat.c, Temco.h, revision.h, serial1.c, define.h

// MDF 8/18/04 changed default sop1 table for Fan OFF to match AUTO
//		now that we have the occupied/unoccupied settings working correctly
//		control_logic.h

// MDF 9/16/04 Changed the default valve setting table for Heating2 and Cooling2.
// 		control_logic,h

// MDF 9/21/04 Added short cycle and changeover delays for the mode of operation.
//		control_logic.c, tstat.c

// MDF 9/21/04 Increased max temperature and setpoint to allow tstat to function with boilers.
//		if the temperature/setpoint goes over 100, the decimal point gets shift in order to display properly.
// 		tstat.c, define.h, temperature.c

// MDF 10/20/04 Added 15ms delay anytime a relay switches to avoid reading or writing to the EEPROM during a switch.
// 		output.c

// MDF 10/20/04 Setup system of registers to control the functionality of the LEDs
//		modbus.h, serial1.c, tstat.c

// MDF 10/24/04 Setup bit1 of info_byte to reflect a watchdog reset.  SRS will be displayed on power-up
//		tstat.c

// MDF 10/24/04 Setup bit2 of info_byte to prevent reset during serial writes.
//		serial.c

// MDF 10/12/04 Added code to control zero-voltage crossing based on External Interrupt 1 
//		output.c, tstat.c

// MDF 10/12/04 Added Low voltage test to prevent writing to the E2 chip if the voltage gets too low 
//		tstat.c, TH_ee.c

// RL	18/11/04
//			- added memory storage when doing ISP.  NOw only has laddress in it.  If more data... need to do memory allocation

// MDF 12/01/04 added a 2nd query of PIC on startup incase first one was missed.
// 		pic.c

// MDF 12/01/04 Changed routines of PIC slightly to fix small bugs in I2C communication.
// 		pic.c 

// MDF 12/06/04 Added feature to tSS and DI1 to allow for 2-pipe operation.
// 		Temco.h, control_logic.c 

// MDF 12/06/04 Added Ort - OVERRIDE_TIMER to allow user to override the unoccupied mode of the clock
// 		Temco.h, define.h, LibDisplay.h, tstat.c  

// MDF 12/07/04 Fixed bug with changing the address from the keypad menu
// 		tstat.c  

// MDF 12/08/04 Changed units of output delays from 0.1 seconds to 1.0 seconds
// 		tstat.c, output.c 

// MDF 12/08/04 Modified the update_status register to allow for a complete erase of the eeprom by writing 0x8F
// 		tstat.c, serial.c 

// MDF 12/10/04 Users now allowed to write to the COOL_HEAT_MODE register if tstat is in 6-button mode.
// 		serial.c 

// MDF 12/14/04 Fixed eeprom erase function triggered by writing to register 16..
// 		tstat.c 

// MDF 12/14/04 Fixed serial write to AUTO_ONLY.
// 		serial.c 

//REV24.4

// MDF 6/29/04 Added code to switch between occupied and unoccupied mode
// upon trigger of digital input
//		tstat.c, Temco.h

// MDF 6/30/04 Added menu items, night heating setpoint, night cooling setpoint.
//		tstat.c, define.h, temco.h, LibDisplay.h, modbus.h

// MDF 7/1/04 Added response_data() before reset on certain serial com items so that tstat replies
// 	before resetting.
//		serial1.c

// MDF 7/5/04 Moved the addition of the calibration term to after the temperature filtering.
// 		temperature.c

// MDF 7/5/04 Changed code so that AUT=0 allows manual fan speeds.  AUT=1 only allows off and auto
//		tstat.c, serial1.c


//REV24.3

// MDF 6/21/04 TXEN pin needs to be set low immediately.  This will prevent interference
// 		on the 485 bus in case of E2 failure
//		tstat.c

// MDF 6/24/04 Now make sure that the fan does not increase above the allowed level set by FAN_MODE
//		control_logic.c, Temco.h, tstat.c

// MDF 6/25/04 changed the timing of responses to valid and invalid packets.
//		4ms needed to recover from invalid packet. 10ms delay when responding to a valid packet.
//		serial1.c, tstat.c, serial.h

//REV24.2

// MDF 6/1/04 Increased the EVENT_QUEUE_SIZE from 3 to 6
// 		define.h

// MDF 6/1/04 Changed display of nHS and nCS parameter to nHd and nCd
//		tstat.c

// MDF 6/7/04 Added REVT define to specify for various differences in the new tstat
//		define.h, Temco.h


// MDF 6/7/04 Added EXTERNAL_SENSOR_1
//		define.h, modbus.h, serial1.c

//REV24.1


// MDF 5/3/04 Changed LED_r to look better when displayed.
// 		LibDisplay.h

// MDF 5/7/04 Added register 180 - EXTERNAL_SENSOR_0 register.  now 
//		it is possible to always read the external sensor reading regardless of TEMP_SELECT.
// 		modbus.h, define.h, serial.c, output.c

// MDF 5/31/04 - Changed default night heating and cooling setbacks from 3 to 10
//		temco.h

// 4/5/04-Rev.24  Added code to initialize_eeprom() to set the address to 1 as a default.

// MF 4/13/04 when an on/off module is detected, MUX pins will also be used to drive relay4 and relay5

// MDF 4/29/04 re-wrote modbus routines to comply with modbus standards and to reduce error rate
// 		serial1.c, tstat.c - COMDEALWITH