The DS9490B is a USB bridge and holder for a single F5-size iButton . The iButton is securely held behind a latched door. The DS9490R is a USB bridge with 1-Wire RJ11 interface to accommodate 1-Wire receptacles and networks. For a list of suitable 1-Wire network cables, refer to the Connectivity Matrix table in the DS1402x 1-Wire network cables data sheet. Both adapters are based on the DS2490 USB-to-1-Wire bridge chip. Free software drivers for Windows -based PCs can be downloaded from www.maximintegrated.com/1-Wiredrivers.
High-Speed 12Mbps Universal Serial Bus (USB) Interface
Supports Standard and Overdrive 1-Wire Communication
Slew-Rate-Controlled 1-Wire Timing and Active Pullup for Improved 1-Wire Network Performance
DS9490R has an RJ11 Interface for Standard Connectivity Accessories such as the DS1402D-DR8
DS9490B has an iButton Interface and Retains a Fixed iButton
Built-In Custom DS2401 Identification Chip
Reads all 1-Wire and iButton Devices. Writes All Except EPROM 1-Wire/iButton Devices