The SEI-USB is an interface device that connects US Digital’s SEI compatible devices to a standard USB 1.1/2.0 port. SEI (Serial Encoder Interface) bus is a simple, quick and convenient network that connects up to 15 addressable SEI devices.
The SEI-USB will supply power form the USB port to a limited number of SEI devices on the bus. The SEI-USB limits the power to the maximum design spec of the USB port. A red LED will be lit when additional power is required and the PS-12 power supply should then be used. For applications requiring a large number of SEI devices which exceed the SEI-USB power rating, an external 12 VDC power supply can be connected to the SEI-USB’s power port.
The SEI bus uses two RS-485-like differential pairs, one for “busy” flow control, and the other for bi-directional serial data.
Features:
RoHS compliant
USB 1.1 device communicates at 12 Mbit/sec
Compatible with USB 2.0 hubs, and host adapters
Supports USB suspend and resume modes
USB drivers are included for Windows 2000 / XP / Vista
Supports up to 15 total devices on the SEI bus
Supports SEI bus lengths up to 1000 feet, depending on the number of devices attached.
USB port on the PC provides power for the SEI-USB and SEI bus devices (120mA max using USB port power).
Includes two LED indicators: green for USB power-sense and red to indicate additional external power is required.
Short-circuit power protection between the USB port and the SEI bus.
