though  they  had  been  individually  selected  by  the operator. This feature is particularly useful for function sequences  that  are  time  consuming  and  frequently performed. User functions may be linked to other user functions at any sequence, or into a loop, so that they may run continuously until canceled. Time delays may be built into user functions to allow time for correct execution, operator observations, or prescheduled sequences. Discussion of all PUP user functions are beyond the scope of this text.    For a detailed discussion of user functions, time delays within user functions, end user function  definitions,  examining/editing  user  functions, executing user functions, and the canceling of user functions,  refer  to  section  11  of  the  technical  manual, Operation  Instructions  Principal  User  Processor (PUP)  Group/Doppler  Meteorological  Radar. STATUS  AND  ALERTS There are two types of status and alerts: those that are selected and those that are automatically displayed. The  11  operator  selected  status  options  are  as follows: 1. NEXRAD Unit Status (operator selected and automatic  display) 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. Types of Products Available in PUP Data Base Products in PUP Data Base (by ID number) Earliest lime in PUP Data Base RPG  Products  Available Monitor  Performance  Display System  Status Status  of  Archive Communications  Line  Status Status  of  Background  Maps Alert  Status  Display All of these may be selected via the alphanumeric (S)TATUS or (M)ONITOR PERFORMANCE commands. The NEXRAD unit status is also available as a graphic display, selected from the graphic tablet. Discussion  of  PUP  status  and  alert  functions  are beyond the scope of this text. For a detailed discussion of status and alert functions, refer to section 8 of the technical manual,  Operation  Instructions  Principal User  Processor  (PUP)  Group/Doppler  Meteorological Radar. ARCHIVING DATA All  archive  functions  may  be  selected  via  the alphanumeric  (A)RCHIVE  menu.  The  archive functions  are  used  to  record  to  optical  disk  and  recall from  optical  disk:  products,  received  background  maps, and status message data. Only one non-auto archive function may be performed at a time per archive device. Monitor performance data is recorded onto a streamer tape rather than an optical disk. PUP archived optical disks or RPG archived optical disks may be used at any PUP location. However, at a PUP or RPG, created optical disks can only be read, not written to. If archived products are to be read in by another PUP associated with a different RPG, it is possible  to  archive  background  maps  with  them.  The background maps must be requested from the RPG over the dial-up communications line or read in from an optical  disk  in  order  to  be  able  to  archive  them. Optionally, the other PUP may have the necessary set of maps  prestored  on  optical  disk.  When  reading  an archive  optical  disk  with  products  from  another  RPG, you  must  read  the  correct  set  of  background  maps  off this or another optical disk before the products can be displayed with maps. Maps for the associated RPG can be read from optical disk into the associated background map  file.  Additionally,  maps  from  up  to  three non-associated  RPGs  can  be  read  from  optical  disk  and be stored in auxiliary map files where they remain until they are replaced by retrieval of a selected map set from optical disk to a specified auxiliary map file. Optical disks used in the Training mode are created using the write archive functions. If an optical disk is to  be  used  for  training,  and  the  training  is  to  be performed at a different PUP site than where the optical disk was made, follow the instructions in the previous paragraph on using optical disks at other locations. There  are  two  types  of  archive  devices  associated with a PUP system, optical disk and streamer tape. The optical disk is the main archive device and is used for writing to and retrieval from optical disk, background maps (received from an RPG over a dial-up line), status messages,  and  associated/auxiliary  map  sets.  The streamer tape device is used only for the archive of monitor  performance  file  data. Discussion of archiving optical disk and tape usage is  beyond  the  scope  of  this  text.  For  a  detailed discussion of archiving optical disk and tape usage, refer 12-14