HT-CM400 NXP Semiconductors, HT-CM400 Datasheet - Page 71

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

98-02-10
3.8.8 WriteSecret_LT
This command writes new HITAG 2 personalization data (4 data bytes) into the EEPROM of the
read/write device.
This command requires the old data to be transmitted as well, which means that data can only be
changed if the user knows the old written data.
Access rights and conformity between the sent old data and the stored data are verified before
command execution.
C-Function: void proloc_WriteSecret_LT (BYTE_T num, DWORD_T od, DWORD_T nd);
Header-File: PROLBLT6.H
Serial protocol:
HOST - READ/WRITE DEVICE
num:
OD[0] ... OD[3]:
ND[0] ... ND[3]:
READ/WRITE DEVICE - HOST
Status:
If any error occurs, KeyInit Mode is exited immediately.
0x0B
0x02
Status
'W'
defines which information is to be written
0x00 ... KEY LOW
0x01 ... KEY HIGH
0x02 ... Password TAG
0x03 ... Password RWD
- 11 ... EEPROM WRONG OLD DATA
- 12 ... EEPROM WRITE PROTECTED.
- 1 ... SERIAL ERROR (in this case the error can also mean, that the read/write
0 ... no error
BCC
num
Old data
New data to be written
device is not in the KeyInit Mode!)
7
OD[0]
0
-----
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Page 71 (104)
Rev. 1.0
31 24
OD[3]
7
ND[0]
0
-----
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Communication Reader-Host
31 24
ND[3]
Htswp.doc/HS
BCC