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CHAPTER 4: Operation
4.3.8 S
ET
M
AXIMUM
P
ORTS
(SW628A-R2 O
NLY
)
Use this command to tell a 4-port ServSwitch Jr. MP the total number of CPU ports
to which computers are or will be connected. This allows the scan function to cycle
correctly if you have computers attached to only two or three of the Switch’s CPU
ports. To issue the Set Maximum Ports command, press and release the left
Control Key, type [P] followed by the total number of ports accessible to that
Switch ([2] or [3]), and press [ENTER]. To save a new Maximum Ports setting,
you must issue a Keep Settings command.
4.3.9 S
ET
S
CAN
-D
ELAY
T
IME
Issue the Set Scan-Delay Time command to set how long, in seconds, the
ServSwitch Jr. MP will pause at each of the CPU ports when it’s scanning them. The
factory-default setting is 5 seconds. To set a different delay time, press and release
the left Control Key, type [T] followed by the new delay time in seconds (1 to 15),
and press [ENTER]. (If you issue this command with an argument of zero, the
ServSwitch Jr. MP will set the scan-delay time to the default value most recently
saved in NVRAM.) Enter the Keep Settings command after you enter this
command.
4.3.10 S
ET
K
EYBOARD
M
ODE
(PC CPU
S
O
NLY
)
Keyboard “modes” are electrical signaling protocols that determine how a powered
PC type CPU and keyboard interact. A CPU and keyboard must use the same mode
in order to work with each other. Of the three standard keyboard modes currently
in use, mode number 2 is the one used by the vast majority of PC CPUs. It is also
the default state of all 101-key and PS/2 keyboards. Mode 1 is used primarily by
certain PS/2 CPUs. Mode 3 is used by RS/6000
®
CPUs, some other UNIX
®
based
computers, and certain specialized servers.
The ServSwitch Jr. MP supports all three of these modes: As it receives signals
from one of the keyboards, it sends them to the currently selected PC CPU by
emulating a keyboard of the appropriate mode for that CPU; as it receives signals
for one of the keyboards from the currently selected or scanned CPU, it sends
them to that keyboard by emulating a CPU of the appropriate mode.
Most CPUs that use keyboard mode 1 or 3 send a “mode command” to the
keyboard at power-up, to put the keyboard in the proper mode. A ServSwitch Jr.
MP can use these commands to automatically detect each such CPU’s keyboard
mode when you turn on the CPU
after
it has been cabled to the Switch. However,
the Switch doesn’t automatically save this value; unless you send it a Keep Settings
command, it will forget the modes it has detected when it is powered down, then
default to each port’s most recently saved setting when it’s powered up again.
