Black Box ServManager SW995A-R2, Руководство пользователя

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CHAPTER 4: Operation
4.3.13 R
ESET
This command, along with the two commands described in the next two
sections, comes in handy when certain problems arise. It will reset or refresh
your shared equipment. Issue it if (a) your shared keyboard gets stuck or
begins behaving oddly, (b) you need to send mouse data to a CPU which
hasn’t enabled the mouse (this can happen if you boot up the CPU while the
ServManager is off or disconnected), (c) your video display has not been
updated to show current conditions, or (d) while using a PS/2 type mouse,
you unplug it, then plug it back in. To issue the Reset command, press and
release the left Control Key, then type [R].
If you’re using a PS/2 type mouse, don’t issue this command to a CPU that
doesn’t have a mouse driver loaded. Many CPUs will crash if you send them
unexpected mouse data.
4.3.14 S
END
N
ULL
B
YTE
PS/2 type mice send control data to CPUs in three-byte increments.
Sometimes, because of electronic transients, unusual power-up effects, or
plugging and unplugging of cables from live equipment, the currently
selected CPU in a ServManager system can lose one or two bytes of this
control information and get “out of sync” with the shared mouse. In this
situation, the mouse might seem to refuse to move the pointer or cursor,
open windows for no reason, or exhibit other strange behavior. To get the
CPU back in sync, send this command to tell the ServManager to send a “null
byte” to the CPU’s PS/2 mouse port (this has no other effect than getting the
CPU “caught up”). To issue the Send Null Byte command, press and release
the left Control Key, then type [N].
If the mouse still isn’t right after you issue this command, the CPU must
have been two bytes out of sync. Issuing the command again should do the
trick.
The CPU will be thrown out of sync if it uses a PS/2 mouse and it’s in sync
when you issue this command. Issue this command two more times to get it
back in sync again. This command has no effect on serial mice, or on CPUs
that are not attached to your ServManager system through a PS/2 mouse
port.
If you have version 9.01 or higher of the Microsoft mouse driver, the CPU
should never get out of sync. Contact Microsoft if you would like to upgrade
your Microsoft mouse driver.