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TransCore IT241005422 Manual De Usuario

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IT2410 Tag Programmer User Guide
C-6
Note:  * These commands are write only.
Changing the Global Password
As with personal identification numbers, or PINs, which are used with automatic teller 
machines, the first time that a tag’s global password is changed, it is from the default 
setting. You must know the tag’s current global password before you can change it. To 
change it, you must execute a write request to owner Page 4. The host program that is 
being used to communicate with the reader should prompt you for the current global 
password as well as the new password. Once you change the global password, safe-
guard it to prevent unauthorized access to the tag.
Reading and Setting Nonvolatile Status for General 
Pages
Note:  It is important to make any critical information in the tag nonvolatile, or the 
information is lost when the tag batteries run down, or are changed. 
To find out which general pages of data have been set to nonvolatile status, read owner 
Page 3 by using the global password. 
*
001FH
Write User Password for 
Page 000BH
User
4
*
0020H
Write User Password for 
Page 000CH
User
4
*
0021H
Write User Password for 
Page 000DH
User
4
*
0022H
Write User Password for 
Page 000EH
User
4
*
0023H
Write User Password for 
Page 000FH
User
4
*
0000H
Page lock bits
Owner
2
*
0001H
Reserved for Read 
Password lock
Owner
2
*
0002H
Reserved for Write 
Password lock
Owner
2
*
0003H
Page NV RAM bits
Owner
2
*
0004H
Global Password
Owner
8
Table C-1  Tag Page Layout (continued)
Page Number (in HEX)
Field Name
Area
Length 
in Bytes