Which reader supports the credential formats and panel interface already deployed on site?

The HID 20NKS-00-000000 declares its interface explicitly: Wiegand 32-bit MSB output with support for EM 32-bit and ASP10022 card formats. Wiegand is the de-facto legacy protocol on the vast majority of installed access control panels, meaning this reader connects directly to virtually any controller without a protocol converter or middleware.

The Comelit 909020116 specifies Ethernet (PoE+) as its connectivity method and lists 'secure' under Compatible With — the credential protocol and card format supported are not stated in the provided specifications. Buyers must verify directly with Comelit or the datasheet whether the unit outputs Wiegand, OSDP, or a proprietary protocol before assuming panel compatibility.

How does each reader handle power delivery and environmental exposure?

The Comelit 909020116 draws power exclusively over PoE+ (IEEE 802.3at) at 15.4 W via a single Cat6 Ethernet run. No separate power cable is required. The housing is Grade 304 stainless steel, rated IP67, and described as vandal resistant — suitable for exposed outdoor locations, wet environments, and high-abuse surfaces. Dimensions are 100 × 100 × 16 mm.

The HID 20NKS-00-000000 is listed as suitable for Indoor/Outdoor use, but neither an IP ingress rating nor a vandal-resistance rating is present in the provided specifications. Power method is not specified; the reader uses pigtail or flush-mount terminal block wiring, consistent with conventional low-voltage power from the panel's reader port. Dimensions as provided — 45 × 121.5 × 19.5 inches — appear to be a data error and should be verified against the product datasheet.

What does each reader offer for user feedback and physical installation flexibility?

Both readers provide dual-color LED indication and an audible sounder. The Comelit 909020116 specifies red/green LEDs plus an audible sounder. The HID 20NKS-00-000000 specifies red LED in standby, green flash on a successful read, and an audible buzzer — providing granular state indication at high-traffic lanes.

For mounting, the HID unit offers both flush-mount terminal block and pigtail wiring options with surface-mount installation. The Comelit 909020116 is described as an enclosure form factor; mounting details beyond physical dimensions are not provided in the supplied specifications. The Comelit unit's 100 × 100 mm square footprint fits standard single-gang backboxes common in European installations.

Which should you choose: the 909020116 or the 20NKS-00-000000?

Our take: The 909020116 is the stronger choice when the installation demands outdoor weatherproofing, vandal resistance, and cable-simplified PoE+ power delivery. Its IP67 Grade-304 stainless steel housing and IEEE 802.3at power over a single Cat6 run make it well-suited for exposed perimeter doors where conduit separation is costly. By contrast, the HID 20NKS-00-000000 is the stronger choice when the panel ecosystem is Wiegand-based and credential format is already standardized on EM 32-bit or ASP10022 cards — its 32-bit MSB Wiegand output connects natively to the majority of legacy and mid-range access panels with no conversion layer. The Comelit unit does not disclose its panel protocol in the provided specs, introducing integration risk on Wiegand-only panels. Buyers on a Comelit or OSDP-capable panel platform benefit from the 909020116's infrastructure advantages; buyers maintaining an existing Wiegand ecosystem should standardize on the HID Signo 20.

Side-by-Side Comparison

Spec-for-spec, from manufacturer data.

Frequently Asked Questions

Related Resources

• Comelit 909020116 product page — full specs and to add to a quote
• HID 20NKS-00-000000 product page — full specs and to add to a quote