Black Box ServSwitch Wizard SW651A, User Manual

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SERVSWITCH™ WIZARD
4.2.4 E
NFORCING
M
OUSE
S
PEED
In its factory-default state, the ServSwitch Wizard allows each CPU to handle mouse
communication any way the CPU wants to. However, some CPUs with particular
rare combinations of operating systems, mice, and mouse drivers can be
abnormally sensitive to small timing changes in mouse communication. These
CPUs can react badly to the presence of the Wizard, making persistent timing
errors that cause the mouse to seem slow or sluggish. This has especially been
noted to occur while using Logitech mice with some HP
® Vectra ® machines
running later versions of Windows NT ® and Logitech mouse drivers.
One way to fix this problem is to change the mouse driver. But if this isn’t an
option, at least in the short term, you can send the Wizard the [L][6] command.
This causes the Wizard to take a more active role in mouse communication,
ensuring that the CPU won’t have timing problems and keeping the mouse up to
speed.
L5 ServSwitch Wizard allows CPU to react to the mouse at any speed (default)
L6 ServSwitch Wizard forces normal mouse speed
4.2.5 S
ETTING THE
C
ASCADE
-Q
UERY
C
ODE
Each ServSwitch Wizard uses a special “query code” to detect whether or not it is
connected in a cascade to another ServSwitch Wizard (or to a ServSwitch Wizard
LP, ServSwitch Wizard Pro, or ServSwitch Duo). By default, your Wizard uses query
code “AD” hex; this code should be fine for most applications. However, older
ServSwitch Duos with firmware versions earlier than 1.09 always use query code
“EF” hex, and because it is essential that all of the switches in a ServSwitch
Wizard/Duo cascade use the same query code, you’ll need to change the Wizard’s
query code to “EF” if any of those older Duos are hooked up to your cascade.
L7
Cascade-query code = “AD” (default)
L8 Cascade-query code = “EF”