HT-CM400 NXP Semiconductors, HT-CM400 Datasheet - Page 81

• Manufacturer Part Number: HT-CM400
• Description: Ht Cm400; Ht Rm440 Family; Ht Rm800 Family Interface Protocol Reader - Host
• Manufacturer: NXP Semiconductors

98-02-10
Rev. 1.0
Transponders
Blocks 4 to 7 can be used either as secret or public areas (configurable), and Blocks 2 to 7 either
as read / write or read only areas (configurable). You can also modify keys and logdata and
prevent them from being accessed.
Finally the Configuration Page itself can be set to read only.
It is extremely important to be particularly careful when using the Configuration Page (it
only can be set to read only once!), keys and logdata as you can lose access to the secret
area on the transponder if you make a mistake.
ATTENTION:
Changing of the Configuration Page (Page 1), Keys and Logdata must be done in secure
environment. The transponder must not be moved out of the communication field of the
antenna during programming! We recommend to put the transponder close to the antenna
(zero-distance) and not to remove it during programming.
4.1.2 Anticollision
Anticollision Mode in Long Range applications including HITAG 1 transponders permits you to
process several transponders simultaneously. Theoretically up to 2 32 transponders can be
processed simultanously. In practice this number is limited, because of the mutual influence of the
transponders - they detune each other, if there are too many too close to each other.
In Proximity applications only one transponder is handled even if there are several transponders
within the communication field of the antenna. In this case either no communication takes place or
the "stronger" or closer transponder takes over.
By muting a selected transponder (HALT Mode) another transponder that is to be found in the
communication field of the antenna can be recognized.
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Htswp.doc/HS