>>>YOUR ELECTRONICS QUESTIONS ANSWERED HERE BY N&V READERS
detector for each 'leg' of the fence.
Since its pulsed, you could probably
create some sort of 'missing pulse'
detector (the old retriggerable mono-stable trick), just be sure to drop that
16 kV down to something safe.
However, rather than trying to
detect fence events, it seems like a
more robust approach would be to
add some sort of motion detection for
both sides of the barrier. And, indeed,
I'd suggest a 'fence integrity violation'
detection capability. I am imagining an
array of mirrors arranged such that
you get a 'curtain' of light alongside
the wires, with a laser at one end of
the curtain and some sort of photo
detector at the other. If you extend the
light curtain above the fence, you
could detect jumping events (but you
might also detect birds landing on
the wires!). Maybe a combination of
traditional motion detection (sonar, IR,
or radar) to enable the notification
from light curtain events.
If you had two fences (pretty
close together), you could detect ANY
motion inside that 'no animal zone'
and declare an event (somehow you
need to ignore birds, though).
[#9107 - September 2010]
Keystone Jack Wiring
I need data/instructions on how to
wire a keystone jack per specs 368A/B.
EIA/TIA 368 is a standard for
frequency division multiplexing. I am
going to assume you mean EIA/TIA
wiki/T568A#Wiring; see Figure 2.
Note that the only difference
between T568A and T568B is that
pairs 2 and 3 (orange and green) are
swapped. Both configurations wire the
pins "straight through," i.e., pins 1
through 8 on one end are connected
to pins 1 through 8 on the other end.
Also, the same sets of pins are paired
in both configurations: pins 1 and 2
form a pair, as do 3 and 6, 4 and 5,
and 7 and 8. One can use cables
wired according to either configuration
in the same installation without
significant problem; problems involving
crosstalk can occur (which is normally
minimized by correctly twisting a pair
together), but are usually insignificant
in all but the most stringent specifications such as Category 6 cable. The
primary thing one has to be careful of
is not to accidentally wire the ends of
the same cable according to different
configurations (unless one intends to
create an ETHERNET crossover cable).
NEW MESSAGE DISPLAY
Shop online: noritake-vfd.com
• Bright VFD technology
• Easy to use
• USB or RS232
2635 Clearbrook Drive
Arlington Heights, IL 60005
(847) 439 - 9020
Various VFD modules available