Which reader supports a broader or more specific set of credential technologies?

The HID-920-PTNN reads 13.56 MHz (high frequency) and 125 kHz (low frequency) cards, fobs, and mobile devices via HID Mobile Access®. The spec does not enumerate specific card protocols beyond the two frequency bands.

The Kantech KT-SG-MT-KP2 explicitly lists DESFire, MIFARE Plus EV1, ISO/IEC 14443A/B, HID Proximity, ioProx, and NFC/13.56 MHz at the 13.56 MHz band, plus 125 kHz Prox — providing named protocol granularity that the HID spec does not match. It also adds an integrated numeric keypad, enabling PIN-only, card-only, or card-plus-PIN multi-factor authentication at the reader level without a separate keypad device.

For sites already standardized on HID Mobile Access® credentials or mixed HID card/fob populations, the HID-920-PTNN covers the use case. For deployments requiring explicit MIFARE Plus EV1 or DESFire card support — common in university, healthcare, or government card programs — the Kantech's enumerated protocol list provides clearer spec-level assurance. The KT-SG-MT-KP2's keypad also adds a factor of authentication that the HID-920-PTNN does not provide in a single device.

How do the two readers integrate with access control panels and third-party systems?

The HID-920-PTNN communicates exclusively via OSDP (Open Supervised Device Protocol) over a wired interface. OSDP is an industry-standard, bidirectional, supervised protocol that supports encrypted communication and remote management with compatible panels. The spec confirms wired connectivity and does not list Wiegand.

The Kantech KT-SG-MT-KP2 supports OSDP, Wiegand, and RS-485, giving integrators three interface options. Wiegand compatibility is significant for legacy panel infrastructure — a large share of installed access control panels in North America still use Wiegand. RS-485 enables multi-drop bus wiring. The KT-SG-MT-KP2 also specifies AES-256 encryption; the HID-920-PTNN spec does not state an encryption standard.

For new OSDP-native panel deployments, both readers are viable. For retrofit projects where Wiegand panels cannot be replaced, only the Kantech KT-SG-MT-KP2 is specified to be compatible. The absence of a stated encryption spec for the HID-920-PTNN is a gap worth clarifying with HID for high-security applications.

What are the physical installation requirements and power considerations for each reader?

The HID-920-PTNN is described as a wall-switch proximity reader powered by DC (input voltage listed as DC; marketing copy also notes AC/DC). It features intelligent power management rated at up to 59% energy reduction compared to a baseline not specified in the provided specs. Physical dimensions and weight are not provided in the spec sheet.

The Kantech KT-SG-MT-KP2 is a single-gang mullion form factor measuring approximately 4.56 in. (W) × 1.76 in. (H) × 0.97 in. (D) and weighing 0.45 lb. It is specified for North America and Europe electrical box mounting and requires 5 VDC input. Dimensions listed in the raw spec data (115.8″ × 44.6″ × 24.7″) appear to be a data entry error and should be verified against the manufacturer datasheet before ordering.

The HID-920-PTNN's wall-switch form factor may suit locations where a standard wall-plate aesthetic is required. The Kantech's single-gang mullion profile suits narrow doorframe and mullion installations. The KT-SG-MT-KP2's 5 VDC input is narrower than the HID's stated DC (range unspecified); installers should confirm panel power supply compatibility for both units.

Which should you choose: the HID-920-PTNN or the KT-SG-MT-KP2?

Our take: The Kantech KT-SG-MT-KP2 is the stronger choice when the deployment requires legacy Wiegand panel compatibility, explicit MIFARE Plus EV1 or DESFire card protocol support, integrated PIN keypad for multi-factor authentication, or a compact single-gang mullion form factor. It adds Wiegand and RS-485 alongside OSDP — covering retrofit and new installations — specifies AES-256 encryption, lists six named credential protocols versus the HID's two frequency bands, and integrates a keypad without a second device. It also carries a lifetime warranty versus HID's 2-year coverage. The HID-920-PTNN is the stronger choice when the site is standardized on HID Mobile Access® smartphone credentials, the panel is OSDP-native, and a wall-switch aesthetic is preferred — it is the only unit here with stated mobile device support. Platform qualifier: on Kantech EntraPass or Tyco Software House C•CURE environments, the KT-SG-MT-KP2 will have validated integration; confirm HID reader certification for your specific panel before specifying either unit.

Side-by-Side Comparison

Spec-for-spec, from manufacturer data.

Frequently Asked Questions

Related Resources

• HID HID-920-PTNN product page — full specs and to add to a quote
• Kantech KT-SG-MT-KP2 product page — full specs and to add to a quote