wiegand data interference
Dave White
data to my controller. all voltages are good at the reader. think it may be
interference causing problems.
will a wiegand extender fix this issue?
Effenpig1
It's impossible to answer that question without further
troubleshooting.
Have you used a program like Hyper-terminal to check the data string
at the controller end?
Silicon Sam
Have you tried pull-up resistors at the panel end on the data lines
0 and 1 yet?
Bob La Londe
news:%L7%m.30$nR4...@newsfe01.iad...
1. What is the total distance of wire from reader to controller?
2. Is the wire shielded with the shield connected to the ground lug at
the central controller?
3. Did you use the correct gage wire?
3. Did that reader work reliably before?
kjwkjw
wrote:
I used to work for an access control manufacturer and a wiegand
extender was always recommended when interference was present. Another
option that I've seen work well in the field is a unit now made by
Schlage (or IR or whatever):
http://www.ir-swa.com/GEK.shtml
These are expensive, though.
Bill
cable. This keeps outside electrical noise out. Ground one end of the metal
foil.
Then there is "voltage drop" with long distances. Use a larger gauge wire
for long distances. Something which starts out as 5 volts on one end can be
2 volts at the other end!
Voltage drop calculator...
http://www.nooutage.com/vdrop.htm
Shielded cable...
http://images.google.com/search?q=Shielded+cable&hl=en&sa=N&um=1&ei=ixs-S8_8DIyGtAOlod0G&oi=images_breadcrumbs_list&ct=images-breadcrumbs-list&cd=1
"Dave White" wrote in message
techie
interferecne has been known to be in the traveler cables of some MFRs
elevator. An extender may or may not work, that would depend on the
tolerance of the receiver of the weigand signal.
"Dave White" <renof...@shaw.ca> wrote in message
news:%L7%m.30$nR4...@newsfe01.iad...
Dave White
"Silicon Sam" <silic...@gmail.com> wrote in message
news:73bdfce8-8353-4ba1...@d20g2000yqh.googlegroups.com...
nope, what value of resistor? is it manufacturer specific?
Dave White
elevator company ran the wire which is 18/2 gauge pairs with overall shield.
"Bill" <billnoma...@yahoo.com> wrote in message
news:7q6kfi...@mid.individual.net...
Dave White
extender that will work with 18/2 wire with overall shield.
all the manufacturers extenders that i can find spec out twisted pair wire,
I think most of them convert the wiegand to 485 then back to wiegand at
receiving end.
"techie" <nor...@techie.com> wrote in message
news:hhmcu...@news3.newsguy.com...
Dave White
I would assume that is dependant on the wiegand format?
I am using paradox R885 readers with 26 bit weigand format.
"Effenpig1" <dirtysp...@hotmail.com> wrote in message
news:63fb6195-c23d-47b5...@u41g2000yqe.googlegroups.com...
Silicon Sam
> "Silicon Sam" <silicon...@gmail.com> wrote in message
I was just going by one install I did where 12 of the 36 readers
would not read a card correctly and they all happened to be the
readers that were farthest away. Our tech guru at our office said to
put some pull up resistors between the power and Data 0 and power and
Data 1 lines at the panel. Every reader was working after that.
I just happen to be going by the site tomorrow morning for remodel
work, I'll look at the resistor value. It's been 3 years since I did
it. It is a Lenel system with the Indala readers.
Gonna say it's either 1K or 4.7K resistors. I'll look when I get
there and post tomorrow.
Silicon Sam
> the reader is in the elevator car. the problem i am having is finding an
> extender that will work with 18/2 wire with overall shield.
> all the manufacturers extenders that i can find spec out twisted pair wire,
> I think most of them convert the wiegand to 485 then back to wiegand at
> receiving end.
>
> "techie" <nor...@techie.com> wrote in message
>
> news:hhmcu...@news3.newsguy.com...
>
>
>
> > Does the reader travel with lift or is it at a floor for access? A lot of
> > interferecne has been known to be in the traveler cables of some MFRs
> > elevator. An extender may or may not work, that would depend on the
> > tolerance of the receiver of the weigand signal.
>
> >news:%L7%m.30$nR4...@newsfe01.iad...
> >>I am having issues with a card reader in my elevator not sending wiegand
> >>data to my controller. all voltages are good at the reader. think it may
> >>be interference causing problems.
> >> will a wiegand extender fix this issue?
What kind of system is it? Controller model? Brand and model of
reader?
Dave White
cool, I am going to my site today, will try out some different resistor
values
Silicon Sam
Went by today, it was 4.7K resistors.
Dave White
corrected the problem today.
I split up the wiegand wires onto different pairs.
works great now!
Effenpig1
> what settings would i set up hyper-terminal for?
> I would assume that is dependant on the wiegand format?
> I am using paradox R885 readers with 26 bit weigand format.
>
>
> news:63fb6195-c23d-47b5...@u41g2000yqe.googlegroups.com...
> On Dec 31, 3:24 pm, "Dave White" <renofus...@shaw.ca> wrote:
>
> > I am having issues with a card reader in my elevator not sending wiegand
> > data to my controller. all voltages are good at the reader. think it may
> > be
> > interference causing problems.
> > will a wiegand extender fix this issue?
>
> It's impossible to answer that question without further
> troubleshooting.
>
> Have you used a program like Hyper-terminal to check the data string
> at the controller end?
Usually set the baud rate at 9600 and leave the rest of the settings
default.Hyper terminal is great for determining that the data is being
sent properly before you start chasing ghosts. Kinda makes you regret
tossing those old windows 95 laptops with the serial port among other
reasons