Nebb USB Sharing Device Switch

The main purpose of the USB Sharing Device Switch (USB-SDS) is providing an industrial solution for sharing one USB device (e.g. keyboard, mouse, printer etc.) between two computers.

The switching is achieved by an external control voltage (a switch, PLC etc.) of 24 VDC between M and L+K.

An auxiliary switch (C+A/B) is incorporated for indicating the current state to a third device (e.g. a PLC) or for performing additional switching of, for example, a KVM solution.

M	Ground
L	Control signal for power and aux. switch
K	Control signal for data switch
USB A	USB connector type A for the switched device
A-C	Connected while no power on L
B-C	Connected while power on L
USB B/1	Connected while no power on K
USB B/2	Connected while power on K

There is no interference with the USB protocol itself, just passive switching. Introducing this unit may reduce the maximum cable length allowed. USB cables are not included.

Operation

Normal state	A to B/1	No control voltage on L+K	A-C is closed
Switched state	A to B/2	24 VDC between M and L+K	B-C is closed

L+K are normally connected; when not so the USB device may draw power from the other USB source.

Options

The unit can be supplied with support for alternative control voltages above 5 VDC.

Technical data

Control voltage M – L+K	24 VDC, 4 mA
Max load on A/B to C	0.5 A at 125 VAC, 2 A at 30 VDC (60W)
External connections	1x USB connector type A 2x USB connectors type B
Weight	90 grams
Dimensions H x W x D	100 x 75 x 24 mm
Installation	DIN-Rail
Product number	USBS01/24

Datasheet valid as of May 2008.

For more information, please contact Nebb Norway.