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.