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.
