Key Fob Entry Systems for Houston Apartments, Condos, Offices and Townhome Gates

How fob access changes from one part of Houston to the next

The reader looks the same on every wall, but the job around it changes with the building and the neighborhood.

Houston is large and traffic shapes the day, so we group visits by part of town and by each building’s access windows. Call to confirm scheduling for your address.

Copied fobs: the problem most Houston buildings already have

Most older systems in the city use 125 kHz proximity fobs. Each one transmits the same unprotected ID every time it is read, and a pocket copier bought online, or the machine at some key kiosks, can duplicate it in seconds. A resident who would otherwise buy a spare from the office can make five copies for friends, and to the controller those copies are identical to the original. Disabling the resident’s fob at move-out kills every copy too, but until then management has no idea how many working credentials are circulating.

The fix is a credential that cannot be cloned just by reading it:

• 13.56 MHz smart credentials with AES encryption, such as MIFARE DESFire EV2 or EV3 and HID Seos, which authenticate with the reader before giving up anything useful.
• Not MIFARE Classic. It runs at 13.56 MHz, but its encryption was broken long ago and common cloners handle it. It is still sold as an “upgrade.”
• Multi-technology readers during the transition. They accept old prox and new encrypted fobs, so a property can reissue credentials building by building and then switch the old format off on an announced date.

Facility codes, 26-bit numbers and duplicate fobs

The widely used 26-bit Wiegand layout splits into an 8-bit site value, called the facility code, with 256 possibilities, and a 16-bit card value with about 65,000. Properties that reorder bargain fobs from online sellers can receive the same facility code and number range another customer already holds, so a fob from a building across town could, on rare occasions, open your gate. Longer 35-bit or 37-bit formats, or a credential program with numbers registered to your site, remove that overlap.

A duller issue causes many support tickets: the number printed on a fob does not always match what the reader reports. Enrolling each fob by presenting it to a desktop enrollment reader, instead of typing the printed number, prevents a database full of credentials that never work.

Wiegand, OSDP and the wire behind the reader

Wiegand, the wiring used in most existing Houston systems, sends the fob number from reader to controller in the clear over separate data lines. A small logger hidden behind a reader can record every fob presented and replay it later, and nothing alerts the controller if the reader is disconnected. OSDP, the Open Supervised Device Protocol, replaces it with a two-way RS-485 link that supervises each reader and, with Secure Channel turned on, encrypts the traffic.

Whether OSDP can reuse the cable already in the walls depends on that cable. It wants a shielded twisted pair; the untwisted multi-conductor cable on many older installs may pass on a short run and fail on a long one. We meter and test before promising reuse.

The same logic rules out cheap standalone units on exterior doors. When the relay that releases the lock lives inside the outdoor reader, anyone who pries the reader off the wall can bridge the release wires and walk in. Controllers and relays belong on the secure side.

Elevator floor control and parking garage gates

Floor-restricted elevators

A reader in the cab can limit each fob to its own floor plus shared floors. Two things govern the job: whether the elevator’s traveling cable has spare conductors or network capacity to carry the reader, and the building’s elevator contractor, who makes the connections inside the elevator controller. Fire service operation always overrides the restriction. We schedule this work with the elevator contractor, not around them.

Garage gates and barrier arms

Garage readers stand on pedestals at driver-window height, and in Houston that window might belong to a compact sedan or a lifted pickup, so a dual-height pedestal or a long-range tag reader saves drivers from stretching. Exit loops, safety loops under the arm or grille, and a plan for tailgating determine whether the gate secures the garage or merely slows people down.

Floods, outages and where the equipment should live

Harvey showed why an access control panel and its batteries do not belong in a ground-floor garage room. We mount controllers, lock power supplies and batteries above the likely water line and keep gate operator electronics as high as the operator design allows.

Long outages such as those after Hurricane Beryl in 2024 force a question every property should answer on purpose: which doors unlock when power fails and which stay locked. Magnetic locks release without power; most electric strikes stay latched while still allowing exit from inside. Backup batteries buy hours, not days, so we size them against real lock current and tell you the expected runtime.

Working inside managed Houston buildings

• Insurance paperwork. Property managers typically want proof of coverage listing the building owner and management firm before any contractor starts. As a licensed and insured contractor, we send it ahead of the start date.
• Freight elevator and dock reservations, often in fixed windows that set the day’s schedule more than the work itself.
• After-hours cut-overs on occupied floors and in lobbies, so nobody is locked out at lunchtime.
• Scanning before coring. Many concrete buildings here use post-tensioned slabs. Hitting a tendon is dangerous and costly, so no core is drilled until the slab is scanned and the building engineer approves the spot.
• Fire alarm coordination. Any lock that must release on alarm needs the fire alarm contractor to provide and test the release signal.

The sequence EVOTECH follows on a Houston property

1. Survey each opening, the existing panel, the credential format in use and how many active fobs are really in circulation.
2. Export the current cardholder list where the software allows, so no resident or employee is lost in the change.
3. Write an itemized quote that separates hardware, labor, elevator or fire alarm coordination, credentials and any software subscription.
4. Install in phases, one entrance at a time, with old and new credentials both working during cut-over where readers support it.
5. Reissue credentials with management and set the date the old format stops working.
6. Test every door, gate and elevator floor, show the manager how to add and disable users, and leave as-built wiring notes.

What shapes the cost of a Houston fob system

• How many openings there are, and whether elevators or garage gates are included.
• Reusing existing cable and readers versus new home runs.
• Credential type and quantity; encrypted smart fobs cost more than prox, and a large resident count multiplies the difference.
• On-premises software versus a cloud platform billed per door or per user.
• Building rules: after-hours labor, slab scanning, freight elevator windows.
• Coordination time with the elevator or fire alarm contractor.

Why Houston fob systems end up with service tickets

• Nobody holds the admin login after a management company changes, so former residents stay active.
• Fobs enrolled by typed number that never matched the reader’s output.
• Door position switches never installed, so a propped gate never raises an alert.
• Lock power supplies sized with no margin, so voltage sags when several maglocks and a battery charger draw at once.
• Exterior readers with the release relay built in, as described above.

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