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Hot plugging PS/2-style connections and mouse restoration
For computer systems that use PS/2-style keyboard and mouse connections,
it is strongly recommended that you switch off the computer system before
attempting to connect it via the SAM. However, if this is not possible then you
need to ‘hot plug’ the SAM while power is still applied to the system (keyboards
and mice with USB connections are unaffected by hot-plugging). There is
not normally a danger of damage to the system, however, when PS/2 mouse
communications are interrupted, often they fail to reinitialise when reconnected.
SAMs provide a feature to reinstate mouse communications once the necessary
connections have been made.
There are two main types of data formats used by current PC mice, these are the
older ‘PS/2’ format and the more recent ‘IntelliMouse
®
’ format introduced by
Microsoft. These use slightly different data arrangements and it is important to
know which type was being used before you hot-plugged the SAM module. The
previous setting depends both on the type of mouse and the type of driver as
various combinations of PS/2 and Intellimouse are possible. Using the incorrect
restore function may produce unpredictable results and require the system to be
rebooted.
Which restore setting do I use?
The general rule is that unless both the mouse
and
the driver are
both
Intellimouse compatible then you need to restore the mouse as ‘PS/2’.
Recognising an Intellimouse-style mouse
The Intellimouse format was introduced to support, among other features, the
scroll wheel function. If your mouse has a scroll wheel, then it is likely to support
the Intellimouse format. If you have a Microsoft mouse, then it will usually state
that it is an Intellimouse on its underside label.
Recognising an Intellimouse driver
Before hot plugging your SAM (or afterwards using only keyboard control),
access the Windows Control Panel and select either the
Mouse
option (on
Windows NT, 2000 and XP) or the
System
option (on Windows 95, 98, ME).
Look for the name of the driver, which will usually include the words
PS/2
or
Intellimouse
.
To restore mouse operation when hot plugging:
1 Carefully connect the SAM to the system and its keyboard, mouse, monitor
and audio output (if used).
2 Simultaneously, press the hotkeys (by default,
and
) along with
to enter configuration mode.
3 Enter the appropriate restore function code:
•
PS/2
– press
•
IntelliMouse
– press
4 To exit configuration mode, press
.
5 Move the mouse a short distance and check for appropriate on-screen
cursor movement. If the mouse cursor darts erratically around the screen,
then cease moving the mouse. This is an indication that the chosen restore
function is incorrect. Try again using the other restore function.
Note: The restore functions predict the likely mouse resolution settings but
may not restore the exact speed or sensitivity settings that were originally
set.
Microsoft and Logitech -specific mouse settings
In certain installations some Logitech mouse drivers may lose the action of the
mouse buttons when used with the standard ‘Microsoft compatible’ signalling
protocol used between the modules. To solve this problem, select the ‘Logitech
compatible’ mouse signalling protocol.
To change mouse signalling protocols
1 Simultaneously, press the hotkeys (by default,
and
) along with
to enter configuration mode.
2 Enter the appropriate protocol code:
•
Microsoft compatible
– press
•
Logitech compatible
– press
3 To exit configuration mode, press
.
