DS2502-UNW(3)

mac_e mac_fw

read-only, binary
64 bit or 80 bit media access control number. Unique, and unrelated to the 1-wire address. It is apparently used for ethernet or FireWire addressing, respectively.

memory

read-write, binary
128 bytes of memory. Initially all bits are set to 1. Writing zero permanently alters the memory.

pages/page.0 ... pages/page.3 pages/page.ALL

read-write, yes-no
Memory is split into 4 pages of 32 bytes each. ALL is an aggregate of the pages. Each page is accessed sequentially.

project

read-only, binary
32 bit project id. Constant 0x0000 for ethernet and 0x00001128 for firewire. See Datasheets.

DS2502 DS1982

The DS2502 (3) is used for write-once incremental storage. It's main advantage is for audit trails (i.e. a digital purse).

The DS2502-E48 and DS2502-UNW are some of the UniqueWare class of devices. Some of the memory was preprogramed at the factory. See the datasheet for specifics. The DS2502 , DS2505 , and DS2506 differ in their function by the amount of on-board memory they possess. (The internal protocols are slightly different, but the OWFS system handles this automatically.