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The DS9490B, in contrast, is designed to hold a single iButton, perfect for software authorization solutions. The DS9490 family of 1-Wire USB port adapters comes with the following features:

DS9490R
USB port
Internal 64-bit address
Communicates to all iButtons; can read but not write to DS198x EPROM iButtons
RJ-11 out; compatible with DS1402D-DR8 Blue Dot Receptor

DS9490B
USB port
Internal 64-bit address
Single iButton holder
Can be used as a key-chain fob
Ideal choice for software authorization solutions

Serial-Port Adapters
The DS9097U RS-232 Serial Port Adapters and the DS1402D-DR8 Blue Dot Receptor connect to any standard RS-232-C serial port. The DS9097U connects to the serial port and then the DS1402D-DR8 connects to the DS9097U through a RJ-11 connection. The DS9097U is not a pass-through device. A serial port must therefore be dedicated to perform iButton communication.