Cradlepoint USB-Host to Ethernet Adapter PS6U1UHE Uživatelský manuál stáhnout pdf (Strana 7)

US

7,984,226

B2

1

METHOD

FOR

SENSING

AND

AUTO

SWITCHING

BETWEEN

TWO

USB

INPUT

PORTS

TO

A

SINGLE

PORT

ON

THE PDA

FIELD

OF

THE

INVENTION

The

present

invention

relates

to

switching

betWeen

tWo

data

ports,

and

more

particularly,

to

automatically

selecting

one

of

tWo

USB

ports

to

connect

to

a

third

USB

port.

BACKGROUND

OF

THE

INVENTION

A

portable data

device

(PDT)

is

one

of

many

types

of

mobile

data

terminals

(MDTs)

that

periodically

communicate

With

host

devices,

such

as

computers.

Generally

these

MDTs

use

Wired

connections,

the

most

common

of

Which

are

USB

connections

and

connections

over

a

local

area

netWork

(LAN)

such

as

an

Ethernet

LAN.

Suppliers

of

mobile

data

terminals

often

supply

docking

cradles

Which

hold

the

MDTs

and

have

one

or

more

data

jacks

for

plugging

in

the

Wired

data

connec

tions

andpoWer

jacks

or

cables

With

Wall

plugs

to

recharge

the

batteries

in

the

MDTs.

To

accommodate

the

different

data

protocols,

the

docking

cradles

have

tWo

or

more

data

input/

output

jacks

and

conven

tionally

have

a

sWitch

so

that

a

user

can

manually

select

Which

jack

to

use

to

connect

to

the

MDT.

SUMMARY

OF

THE

INVENTION

The

invention

comprises,

in

one

form

thereof,

Routing

circuitry

for

automatically

routing

either

a

?rst

set

of

USB

signals

derived

from

an

Ethernet

local

area

network

(LAN)

at

an

Ethernet

connector

or a

second

set

of

USB

signals

derived

from

a

USB

host

at

a

USB

connector

to

an

output

connector

Which

can

interface

With

a

data

processing

device

includes

USB

supply

voltage

selection

circuitry

that

passes

a

USB

supply

voltage

from

the

?rst

set

of

USB

signals,

or

the

second

set

of

USB

signals,

or

isolates

the

USB

supply

voltages

from

the

?rst

and

second

set

of

USB

signals

from

the

output

con

nector

in

response

to

tWo

or

more

?rst

input

signals,

USB

data

selection

circuitry

that

passes

USB

data

signals

from

the

?rst

set

of

USB

signals

or

the

second

set

of

USB

signals

to

the

output

connector

in

response

to

one

or

more

second

input

signals,

and

USB

supply

voltage

detection

circuitry

that

detects

if

the

USB

supply

voltage

from

the

second

set

of

USB

signals

is

present,

and

generates

the

tWo

or

more

?rst

input

signals

and

the

one

or

more

second

input

signals

in

response

to

the

detection,

Wherein

the

USB

supply

voltage

detection

circuitry

generates

a

?rst

set

of

?rst

input

signals

Which

iso

lates

the

USB

supply

voltages

from

the

?rst

and

second

set

of

USB

signals

from

the

output

connector

When

there

is

a

change

in

the

USB

supply

voltage

from

the

second

set

of

USB

sig

nals,

and

later

generates

a

second

set

of

?rst

input

signals

to

pass

the

USB

data

signals

from

the

?rst

set

of

USB

signals

or

the

second

set

of

USB

signals

to

the

output

connector.

In

still

another

form,

the

invention

includes

a

method

for

automatically

routing

either

a

?rst

set

of

USB

signals

derived

from

an

Ethernet

local

area

netWork

(LAN)

or

a

second

set

of

USB

signals

derived

from

a

USB

host

to

a

connector

Which

can

interface

With

a

data

processing

device.

The

method

comprises

the

steps

of

coupling

the

USB

signals

from

the

?rst

set

of

USB

signals

to

the

connector

if

there

is

not

a

USB

supply

voltage

from

a

USB

host,

coupling

the

USB

signals

from

the

second

set

of

USB

signals

to

the

connector

if

there

is

a

USB

supply

voltage

from

a

USB

host,

and

if

the

USB

supply

voltage

derived

from

the

USB

host

changes

from

not

being

present

to

being

present,

or

from

being

present

to

not

being

20

25

30

35

40

45

50

55

60

65

2

present,

interrupting

the

USB

supply

voltage

to

the

connector

for

a

period

of

time

after

the

change

and

later

applying

the

USB

supply

voltage

from

one

of

the

?rst

and

second

set

of

USB

signals

to

the

connector.

BRIEF

DESCRIPTION

OF

THE

DRAWINGS

The

aforementioned

and

other

features,

characteristics,

advantages,

and

the

invention

in

general

Will

be

better

under

stood

from

the

folloWing

more

detailed

description

taken

in

conjunction

With

the

accompanying

draWings,

in

Which:

FIG.

1

shoWs

a

mobile

data

terminal

(MDT),

a

docking

cradle,

an

Ethernet

local

area

netWork

(LAN)

and

a

personal

computer

interconnected

together

according

to

at

least

one

embodiment

of

the

present

invention;

FIG.

2

is

a

schematic

diagram

of

a

poWer

supply

section

in

a

docking

cradle

in

accordance

With

at

least

one

embodiment

of

the

present

invention;

FIG.

3

is

a

schematic

diagram

of

an

Ethernet

dongle

inter

face

board

With

a

voltage

regulator

for

the

interface

board

and

an

Ethernet

jack

in

accordance

With

at

least

one

embodiment

of

the

present

invention;

FIG.

4

is

a

schematic

diagram

of

a

USB

jack

in

accordance

With

at

least

one

embodiment

of

the

present

invention;

FIG.

5

is

a

schematic

diagram

of

a

MDT

connector

Which

mates

With

a

MDT

resting

in

a

docking

cradle

in

accordance

With

at

least

one

embodiment

of

the

present

invention;

FIG.

6

is

a

schematic

diagram

of

circuitry

for

connecting

a

connector

in

a

docking

cradle

to

signals

to

and

from

a

USB

jack

or

to

and from

an

Ethernet

jack,

either

manually

or

automatically,

in

accordance

With

at

least

one

embodiment

of

the

present

invention;

and

FIGS.

7A

and

7B

are

voltage

Waveforms

of

three

nodes

in

the

circuitry

shoWn

in

FIG.

6

during

a

time

When

the

nodes

are

changing

state.

It

Will

be

appreciated

that

for

purposes

of

clarity

and

Where

deemed

appropriate,

reference

numerals

have

been

repeated

in

the

?gures

to

indicate

corresponding

features.

Also,

the

relative

siZe

of

various

objects

in

the

draWings

has

in

some

cases

been

distorted

to

more

clearly

shoW

the

invention.

DETAILED

DESCRIPTION

Reference

Will

noW

be

made

to

exemplary

embodiments

of

the

invention

Which

are

illustrated

in

the

accompanying

draW

ings.

This

invention,

hoWever,

may

be

embodied

in

various

forms

and

should

not

be

construed

as

limited

to

the

embodi

ments

set

forth

herein.

Rather,

these

representative

embodi

ments

are

described

in

detail

so

that

this

disclosure

Will

be

thorough

and

complete,

and

Will

fully

convey

the scope,

structure,

operation,

functionality,

and

potential

of

applica

bility

of

the

invention

to

those

skilled in

the

art.

FIG.

1

shoWs

a

mobile

data

terminal

(MDT)

10,

a

docking

cradle

12,

an

Ethernet

local

area

netWork

(LAN)

14

and

a

personal

computer

1

6

interconnected

together

according

to

at

least

one

embodiment

of

the

present

invention.

An

Ethernet

cable

18

connects

the

Ethernet

LAN

14

to

an

Ethernet

jack

20

in

the

docking

cradle

12

and

a

USB

cable

22

connects

the

personal

computer

16

to

a

USB

jack

24

inside

the

docking

cradle

12.

The

personal

computer

16

is

the

USB

host terminal

to

the

MDT

10.

A

manually

operated sWitch

26

on

the

dock

ing

cradle

12

has

three

positions,

a

?rst

position

for

manually

selecting

the

Ethernet

connection

and

a

second

position

for

manually

selecting

the

USB

connection.

A

third,

auto

select

position

causes

the

docking

cradle

to

pass

data

signals

back

and

forth

to

the

MDT

10

through

the

USB

jack

24

if

a

host

USB

device

is

connected

to

the

docking

cradle

12,

otherWise

1 2 3 4 5 6 7 8 9 10

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