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CHAPTER 4: Operation
4.3.10 S
ET
S
CAN
-D
ELAY
T
IME
Issue the Set Scan-Delay Time command to set how long, in seconds, the
ServSwitch Jr. 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. 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.
4.3.11 S
ET
K
EYBOARD
M
ODE
Keyboard “modes” are electrical signaling protocols that determine how a powered
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 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. supports all three of these modes: As it receives signals from
one of the keyboards, it sends them to the currently selected 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.
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.
The ServSwitch Jr. can’t detect the CPU’s keyboard mode if the CPU doesn’t
send “mode commands” (most CPUs that use mode 2 fall into this category) or if
the CPU is already ON when you connect it to the Switch (it shouldn’t be). In
these situations, the Switch tries to use the keyboard-mode setting stored in its
nonvolatile memory for that port. The factory-default is mode 2 for all ports. Send
the Set Keyboard Mode command to change the keyboard mode for a port if:
• the CPU on that port uses mode 1 or 3,
• it uses mode 2, but the default setting of the port you want to connect it to has
been changed, or
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