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FreewayRange
Pro-Bel Ltd
• 3.10 Setting the destination assign switch
What s the purpose of the switch marked HIGHER DEST DECODE? Well, because
we make all
Freeway
modules the same, in a router bigger than 16x16, you have
to tell each card what range of sources and destinations it s assigned to. That s
the purpose of this switch. The range is assigned thus:
SW 1
SW2
SW3
SW4
Source and destination Range
0
0
x
x
1-16
1
0
x
x
17-
32
0
1
x
x
33
-4 8
1
1
x
x
49-64
• 3.11 LED indications
Two of the three LEOs simply indicate that power is arriving at the board.
Freeway
routers all operate from two rails
only
(where others
are
needed these
are generated on the
Freeway
cards themselves). The two rails are +SV and -SY.
The third LED is labelled HELLO
.
This is useful in determining if th
e
con tro l
system has spoken to a particular board and
, specifically,
to tell you if you set the
level and
higher dest
decode switches correctly.
When the control system sends a command (say in response to a button push), the
appropriate part of the router responds, depending on how the board
configuration switches are set.
If a board receives a command on which it should act
,
it winks the HELLO LED.
Meaning, Hello, I ve
j
us t received a command that s relevant according to my
programmed
pla
ce
in th
e scheme
of things.
6540T-00
l'Jov
97
28
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