HID's recommended cable for the old Prox line is Alpha 1295C, which is a 5 conductor 22 AWG, untwisted, overall shield. The cable I used to use more than any was West Penn 253186B, which is 18/6 untwisted, overall shield. We sometimes used the 22/6 version of that, rarely, if runs were short.
I'm not sure if twists are detrimental, having never tried it. I imagine if they were it would depend upon which pairs were twisted.
Twisted cat5e and cat6 are not good to be used for wiegand readers. The twist by the data can cause problems with the data packets. If you have to use cat5e or cat6, make sure to have the data running on two different twists. Usually the longer the run, the bigger chance of there being reader issues.
As a gerneal rule, wire that are deisgned for wiegand readers are the best to use. (such as Alpha 5388). These cables are usually, shielded, non twisted multicore cables.
IPVMU Certified | 03/11/15 02:03am
Since the HID transceivers are apparently not using a differential signaling method, i.e. common mode rejection, use of twisted-par would be non-optimal at best.
Common mode rejection is the method that UTP uses to reduce noise. But unlike a shield, you need equipment on both ends to get the benefit. Plus the signals and their inverse must be put on the same pairs.
So without a shield, and due to the added crosstalk resulting from twisting non-inverted signals, IMHO, the performance would be worse than the specified cable.
If there were only 4 wires, I would say that you could use STP, Sheilded Twisted Pair, without incident, by assigning each pair to a single signal, but you have 5 and so would have to double one up...
If you look at the composite cables form my original post all the card reader cables are twisted pair shielded cables. These cables are from reputable manufactures so if they are selling shielded twisted pair cabling for card readers is everyone telling me they don’t know what they are doing? Does anyone have actual backup to prove twisted pair cabling is detrimental? I am not interested in opinions as I have enough of those around the shop.
Quote from HID which I found interesting.
"Do iCLASS Revision C readers still require shielded cabling?
No. HID’s new innovations in RFID reader development significantly reduce installation costs by no longer requiring shielded cable to run between the reader and controller. All wire pigtails exiting the reader no longer contain a shield wire. This new enhancement does not affect data- run length maximums. Utilize twisted pair cabling for maximum noise immunity."
I'd be interested in this as well - I'm spec'd to wire a site for HID readers (I believe mostly MiniProx and maybe a few ProProx keypads) and they have me using Cat5e, would be good to know before we start if I have to have them change the cable spec.
Just a couple of thoughts here. Wiegand was invented some 50 years ago before Cat 5 etc. I think you will find that each manufacturer uses their own wiring specification, and most if not all have settled over the years on the accepted "wiegand" standard, 6 conductor non-twisted, overall shield.
CAT 5 or 6 is designed to extend the ability of the cable to transmit data using tighter winding, the winding canceling out interference. The issue is the power. You will drop too much voltage using 24ga wire to properly power your readers.
I would consult the manufacturers documentation or tech support before using CAT anything. We have tried it in elevators and it did not work well at all. We had to use a Wiegand extender down to the elevator car and standard 6 conductor with an overall shield.