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HTC - PROGRAMMER COMPARISON TABLE

Manufacturer

Model

 
 
 
Recommended
Replacement
Horstmann                                
423 Amethyst 10
X
 
X
   
X
   
X
     
X
X
C
   425 Diadem/Tiara
   CentaurPlus C21
   ChannelPlus H21
423 Amethyst 7
X
 
X
   
X
   
X
     
X
X
C
423 Diamond
X
 
X
   
X
   
X
     
X
X
C
423 Emerald
X
 
X
   
X
 
X
   
X
     
C
   425 Coronet
   CentaurPlus C11
   ChannelPlus H11
423 Pearl Auto
X
 
X
   
X
 
X
   
X
     
C
424 Coral
X
 
X
   
X
     
X
 
X
 
X
C
   425 Diadem/Tiara
   CentaurPlus C21
   ChannelPlus H21
424 Diamond
X
 
X
   
X
   
X
     
X
X
C
424 Emerald
X
 
X
   
X
 
X
   
X
     
C
   425 Coronet
   CentaurPlus C11
   ChannelPlus H11
424 Gem
X
 
X
   
X
   
X
     
X
X
C
   425 Diadem/Tiara
   CentaurPlus C21
   ChannelPlus H21
424 Pearl Auto
X
 
X
   
X
 
X
   
X
     
C
   425 Coronet
   CentaurPlus C11
   ChannelPlus H11
425 Coronet
X
 
X
   
X
 
X
   
X
     
A

   425 Coronet
   ChannelPlus H11

425 Diadem
X
 
X
   
X
   
X
     
X
X
A
   425 Diadem or
   ChannelPlus H21
425 Tiara
X
 
X
   
X
   
X
     
X
X
A
517  
X
   
X
X
 
X
   
X
     
A
   ChannelPlus H17
525  
X
X
     
X
 
X
     
X
 
A
   ChannelPlus H21
527  
X
   
X
 
X
 
X
     
X
 
A
   ChannelPlus H27
Centaur SC1  
X
X
   
X
 
X
   
X
     
C
   CentaurPlus C11
   ChannelPlus H11
Centaur SC7  
X
 
X
 
X
 
X
   
X
     
C
   CentaurPlus C17
   ChannelPlus H17
Centaur TC1  
X
X
   
X
     
X
 
X
 
X
D
   CentaurPlus C21
Centaur TC7  
X
 
X
 
X
     
X
 
X
 
X
D
   CentaurPlus C27
   
A =  Direct plug-in replacement
B =  Direct plug-in replacement with simple wiring changes
C =  Replace backplate and Re-wire required
D =  Replace backplate but terminal connections the same

Please note: In ALL cases where a 24 hour model is stated as the recommended replacement its 7 day equivalent can be used and fitted in the same way.

NOTE: For the sake of clarity CentaurPlus models C21 and C27 have been shown
as recommended replacement models. However, where these are shown replacing
a common time base programmer, CentaurPlus models C121 and C127 could also

be used.