HT-CM400 NXP Semiconductors, HT-CM400 Datasheet - Page 98

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

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5.3.2 Changing Keys and Logdata
You do not have to change keys and logdata in order to operate a system with the
read/write device because access to the secret area of the transponder is possible with the
Transport Keys and Transport Logdata. Nevertheless we strictly recommend to change
these data to be sure no other person (and nobody of Philips Semiconductors) than that
who got the authorization from you are able to access the secret area of the transponder.
If you change keys and logdata, you have to place the transponder directly on the
antenna or hold it directly to it (0-distance)! In order to avoid any errors do not move the
transponder during this write process and be sure that you are in a safe environment
without electrical noise.
5.3.2.1 Changing Keys
Please, note the order of the steps!
1.
2.
3.
Caution: On the transponder the key can only be written, which means that you cannot call up the
entry! Moreover, you need to know the old value if you want to change the key on the read/write
device!
Only after carrying out correctly steps 1 through to 3 (execute a read-access test with the changed key
to check it!) may the second key be changed following the steps described above. Conveniently you
change both keys to the same value!
Htswp.doc/HS
Access the transponder (using the Transport Keys).
Change one key (e.g.: Key A) on the transponder, i.e., overwrite the corresponding page
on the transponder (in this case Page 2) with the new key.
Change Key A on the read/write device to the new value.
Page 98 (104)
Rev. 1.0
98-02-10