Kontron VMOD-2D - Manual (Page 37)

VMOD-2/VMOD-2D
12/15/97
Functional Description
Page 2 - 11 Man. ID 03139, Rev. Index 0200
Figure 2-4: External Reset Connection — Example 4
Note: in example #4, the applied Vcc from machine #2 must be at least
+10V to work the two VMOD-2s connected in series, This does not include
p.d. on length of leads, connector contact resistance, etc.
2.4 ID Byte
An extremely important feature of the VMOD-2 is the ability to "ask it" per software what piggy-
backs are on board. Remembering that once configured and fitted one VMOD-2 is indistin-
guishable from others configured differently. Via this built-in identification feature you can
interrogate the VMOD-2 to return an ID for each of the fitted piggybacks, and if this is inte-
grated into your application software, may be used to check that any given tasks is valid for
the fitted piggyback before execution.
The VMOD-2 can be tested per software in order to determine what type of piggybacks is fit-
ted. If jumper B16 is not set it is offset $7F (location A) and offset $FF (location B), with
jumper B16 set it is $107F (location A) and $10FF (location B). Where our "example" VMOD-
2 fitted with two PB-RELs, would return a "$FC" Byte for both locations.
To synchronize the reset of two (or more)
VMOD-2s (see voltage notes on next
page). The two wires are daisied through two
VMOD-2s and the NC switch/logic before
being joined to Vcc and Gnd at the most
distant end.
Machine #2
VM OD
2
VM OD
2
Vcc
0V or
Gnd
If machine 2's reset logic turns reset loop supply
off, or button pres sed both VMOD-2s will reset
Up
p
er
pi
g
g
yb
ac
k
Lo
w
er
pi
g
g
yb
ac
k
Ma
ch
in
e #
1
Pin-25
Pin-26
Reset
Logic
4).