
Chapter 3
DPU Switch Settings and
Button Controls
Overview
The DPU chassis contains four hexadecimal rotary switches (labeled S1-S4)
and a key lock switch, while the DPU front panel contains pushbuttons for
Reset and Takeover. The three Network rotary address switches (S1, S2 and
S3) are used to establish part of the DPU’s IP address, while the mode switch
(S4) is used to determine the operational mode of the DPU during startup.
The key lock, Takeover and Reset buttons can be used when the DPU is
operational. Refer to this chapter for discussions of these DPU front switches
and buttons.
Setting Address Switches
Use the three rotary switches at the center of the chassis panel to set a unique
DPU Ethernet (maxNET) IP address for the DPU. Proper system operation
requires that no two devices in the system have the same IP address. A
DPU’s IP address is made up of four fields, w.x.y.z. Field w is defaulted to a
setting of 172 decimal. Field x is defaulted to 16 decimal for Network A and
17 for Network B. Field y is set by the left most address switch (S1). The
possible values for field y are hexadecimal 0-F (0-15 decimal).
The remaining two rotary hexadecimal switches (S2 and S3) set the fourth
field of the IP address (z). The range is hexadecimal 00-FF (0-255 decimal).
The two digit hexadecimal number in the switches must be converted to a
single decimal number. Refer to the following table to learn how to convert
hexadecimal values to decimal values.
For example if the three address switches were set to S1 = 1, S2 = 5 and S3 =
7 , the DPU’s Network A address would be 172.16.1.87 (hexadecimal 57 =
87 decimal). The Network B address would be 172.17.1.87.
The number to which a switch is set is the one at the top of the circular face
of the switch (the twelve o’clock position if you think of the switch face as a
clock). This position is indicated by an index mark on the body of the
switch.
The following table explains how to convert the hexadecimal value in the
switches to decimal.
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