Keri Systems MS Format (MicroStar) Compatible Cards & Fobs
Keri's original proprietary format: MicroStar credentials for MS-series readers and PXL-500 Tiger controllers — one of the most widely deployed small-commercial access platforms of its era, still running in thousands of buildings.
Does American Key Cards make Keri Systems MS Format (MicroStar) compatible cards?
Yes — American Key Cards supplies unbranded Keri Systems MS Format (MicroStar) compatible cards and key fobs (AKC Keri MS-Compatible Proximity Card), encoded to your facility code and card-number range and ready to use on your existing Keri Systems readers. No hardware changes and no dealer account required.
- 125 kHz
- Frequency
- RFID prox (Keri proprietary air interface)
- Technology
- 1
- Bit format
- 4+
- OEM part nos.
- American Key Cards
- Order from
The MS format powered a generation of small and mid-size commercial installations: a PXL-500P Tiger controller, a handful of MicroStar readers, and a stack of KC-10X cards was a complete access system, and it simply refused to die. The format is Keri's own — the bit structure was never published — which historically made replacements a single-source affair even as the installed base aged. Our MS-compatible credentials address exactly that: unbranded cards and key tags programmed to register on MS-series readers and enroll through your PXL-500 like the originals. Because MS deployments vary in configuration, we verify against your system details — reader models and a sample credential — before production, and we tell you plainly if your particular configuration needs OEM-channel stock instead. Systems this old deserve straight answers, not guesswork.
Keri Systems MS Format (MicroStar) specifications
- System brand
- Keri Systems
- Technology
- Passive RFID proximity (Keri proprietary air interface)
- Frequency
- 125 kHz
- Credential platform
- Keri MS-family 125 kHz proprietary transponder (MS-series readers also read Indala-family credentials on PXL-500 controllers)
- Bit formats
- Keri MS (MicroStar) proprietary format — exclusive to Keri MS-series readers and PXL-500 Tiger controllers
- OEM part numbers
- KC-10X, MT-10X, PKT-10X, MT-10XP
Specifications reviewed August 2026
Our compatible Keri Systems MS Format (MicroStar) credentials
American Key Cards manufactures unbranded credentials engineered to work with your existing Keri Systems readers — no hardware changes, encoded to your facility code and card-number range before they ship.
Full specifications, form factors and ordering FAQ: Specialty & legacy prox credentials
American Key Cards is an independent manufacturer of unbranded, compatible-by-specification credentials. We are not affiliated with, endorsed by, or sponsored by Keri Systems, and we never supply OEM-branded product — for brand-original credentials, order from Keri Systems or an authorized dealer. Brand names appear only to identify compatibility, and all trademarks remain the property of their respective owners.
Where Keri Systems MS Format (MicroStar) is used
- Commercial buildings with Keri PXL-500P Tiger controllers and MS-series readers
- Retail and small-business installations using MicroStar readers
- Multi-tenant office buildings on legacy Keri MS infrastructure
- Badge replacement programs for Keri MS deployments
Works with these readers
Related formats
You might also need
Keri Systems PXL-250 / Keri Classic 26-bit (K-Format)
The open-standard side of the Keri world: KC-26X-class credentials in plain 26-bit H10301 Wiegand, used on PXL-250 controllers and IntelliProx installations — and readable by any standard 26-bit system.
View compatible cardsKeri Systems NXT
Keri's modern 125 kHz platform: NXT credentials speaking Keri's own card-to-reader protocol on NXT-series readers — the successor generation to MicroStar, deployed across schools, offices, and multi-door commercial systems.
View compatible cardsIndala FlexPass 26-Bit
The classic Indala credential: standard 26-bit facility-code-plus-card-number data delivered over Indala's PSK-modulated air interface — a different radio language from other 125 kHz systems, on millions of legacy doors.
View compatible cardsKeri Systems MS Format (MicroStar) — FAQ
Which readers use the Keri MS format?
The MicroStar family — MS-3000 mullion, MS-5000 single-gang, MS-7000 extended-range, and MS-4000 vandal-resistant readers — feeding PXL-500 Tiger controllers. If your readers carry MS-series model numbers, your credentials are MS-format.
Can MS-series systems also read Indala-family credentials?
Keri's PXL-500 platform historically supported Indala-family credentials alongside MS stock in certain configurations. If your site runs a mixed fleet, tell us — the right replacement depends on which credential type your readers were commissioned around.
How do I know if my building uses Keri MS versus Keri 26-bit?
MS is Keri's proprietary format on MicroStar readers; 26-bit Wiegand appears on Keri systems using standard-format readers or PXL controllers configured for Wiegand input. Your reader model numbers plus a photo of a current card let us identify which you have before you order.
What details do you need for an MS replacement batch?
Your reader models, controller type, and a working sample credential or its printed numbering. MS systems were configured site-by-site, so we confirm compatibility against your actual setup before manufacturing anything.