MSB=$00  to 
$18, LSB=$00 to 
$3C 
RTC Hours and Minutes 
Holds the hours and minutes to which the 
RTC  should  be  set.  The  most  significant 
byte  (MSB)  represents  the  hour  from  $00 
to  $18  (00-24).  The  least  significant  byte 
(LSB) represents  the minutes from  $00 to 
$3C  (00  to  60).  Note  that  the  seconds 
default  to  zero  ($00)  each  time  the  hours 
and minutes are set. 
Examples: 
13:05   = $0D05 
24:00  = $1800 
Low Alarm Display Setting 
Holds  the  value  of  the  gas  reading  at 
which the low alarm display will activate.  
High Alarm Display Setting 
Holds  the  value  of  the  gas  reading  at 
which the high alarm display will activate. 
Cal Gas Value 
Holds  the  value  of  the  calibration  gas  to 
be  used  on  the  instrument.  The  range  is 
from $0000 to $03E8 (0 to 1000
10
).  
Loop High Scaling 
Holds  a  value  which  indicates  the  gas 
reading  represented  by  a  20  mA  loop 
output signal.  The  range is  from  $0000 to 
$FFFF. 
WX Scaled Reading 
Use with WX series controller. 
Table 6-2 ModBus Registers 
 
NOTE: To get the ModBus reading, register  40103 must be  read  as well as 
register  40102.  Register  40103  specifies  where  the  decimal  should  be 
placed.