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CENTRAL   DATA   BUFFER   (CDB)
SENSOR   CONVERTER   GROUP   (SCG)

Fire Controlman Volume 05-Display Systems and Devices
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Figure 4-5.—Central data buffer (CDB) functional block diagram. Scanner  Control  and  Clock  Generation The   scanner   control   and   clock   generation function  provides  the  controls  to  connect  the  CIU  to a  DMU.  A  scanner  enable  signal  is  generated  and sent  to  a  CIU.  If  the  CIU  needs  to  be  connected  to a  DMU,  it  generates  a  DMU  request.  The  scanner and   clock   generation   function   will   connect   the requested   DMU   to   the   requesting   CIU   for   data transfer.   The   scanner   and   clock   generation   function also  generates  all  system  clocks  used  by  the  CDB. CDB   Front   Panel The   CDB   front   panel   is   shown   in   figure   4-6. The  front  panel  provides  the  power  control  and monitoring. The   four   display   channel   switches   are used  to  select  the  display  source  data.  In  the  AUTO position,  any  computer  can  automatically  interface with   the   CDB.   If   the   switch   is   set   to   select   a particular   computer,   that   computer   will   be   the   only data  source.  The  CDB  can  be  tied  to  six  computers; therefore,   the   computer   7   and   the   computer   8 positions  are  not  used. Display  channels  1  and  2  can  be  tied  to  the  same data   source   when   required   by   placing   the   DATA SOURCE  SELECT  switch  in  the  BACKUP  position. If  you  want  display  channel  1  to  use  the  same  data source   as   display   channel   2,   place   the   display channel   1   DATA   SOURCE   SELECT   SWITCH   in the  BACKUP  position.  For  display  channel  2  to  use display  channel  1’s  data  source,  place  the  DISPLAY Figure 4-6.—Central data buffer (CDB) front panel. 4-5






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