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SERVMANAGERS
4.3.10 S
ET
U
NITS
Use this command to tell a ServManager how many submasters (as opposed to
CPUs) are directly attached to it. It doesn’t matter what kind of ServSwitch
device the submaster is. For example, if you were to take an 8-port
ServManager and directly attach another ServManager, three Matrix
ServSwitches, an original ServSwitch, and two CPUs, the ServManager would
have five submasters on it, so you would set Units to 5.
CAUTION!
We strongly recommend that you do not attach submasters of different
types to a master ServManager. If you must do so, make sure that all of
the CPUs attached to any submaster Matrix ServSwitches or original
ServSwitches are IBM type CPUs, and that all of the CPUs attached to
each such submaster use the same type of keyboard and mouse input.
ServManagers use the Units value to find CPU ports. If you select a CPU that
is directly attached to the ServManager, the ServManager can simply switch to
that CPU port. However, if you select a CPU attached to a submaster, the
ServManager has to switch to the submaster’s port and issue switching
commands to the submaster. The Units setting is the only way it knows where,
for example, CPU 18 is, and how to go about accessing that port.
Figure 4-2 on the next page shows a typical pair of alternatives that the
ServManager can’t resolve properly unless Units is set correctly. The
ServManager in the diagram can’t tell merely from its hardware connections
how many submasters it is attached to. Without a number for Units—even
assuming that Width is set correctly to 4—if you were to select CPU 7 on that
ServManager, it would not know whether CPU 7 was attached to a submaster
on port 2 or directly attached on port 4. With Units, the ServManager knows
to switch to port 4 if Units is 1 or to switch to port 2 and send the “switch to
port 3” command if Units is 2.
The default value for Units is 0 (zero). To set Units for a ServManager
(which you may do at any time), press and release the left Control Key, type
[U] followed by the number of submasters (from 1 to 3 digits), and press
[ENTER]. Enter the Keep Settings command after you enter this command.
Units can be set to any value from 0 to 255, but Units values higher than the
number of ports on your ServManager (allowed in order to support future
expansion capabilities) might cause the ServManager to behave
unpredictably.
Please note that if you are sharing Matrix ServSwitch submasters betwen two
ServManager masters in your system, and especially if you have submasters of
other types attached to one or both masters, the Units value might have to be
set differently for each master.
Summary of Contents for ServManager SW995A-R2
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