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Chapter 12
– Connectivity
107
FIGURE 90 - PR-7XX USB DRIVER INSTALL COMPLETE.
USB
H
UB
T
YPE
Virtually all modern computers today supply current through the Universal Serial Bus (USB) hub to power
external devices when necessary. Typically, the current supplied is 500 mA. Some external USB hubs supply
only 100 mA or no current at all. The
USB Hub Type
option provides the means of selecting the power available
to the instrument via the PC for charging the battery. If there is insufficient current available for the USB device
(PR-7XX), Windows will issue a warning and the battery will not charge using the USB interface. Normal
communications do not rely on the USB Hub Type setting.
D
ETERMINING
USB
H
UB
P
OWER
(W
INDOWS
7
O
NLY
)
1. Type
Device Manager
in the PC search bar and open it.
2. Expand the
Universal Serial Bus controllers
selection by clicking on
>
icon.
3. Right click on
USB Root Hub
.
4. Click on
Properties
.
5. Click on
Power
. The
Total power available
is displayed as illustrated in
Содержание Photo Research SpectraScan PR-7 Series
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