SN-HC666 2D Desktop Barcode Scanner

At 200 g without the cable the SN-HC666 is the lightest reader in this desk family, and that number is not a marketing figure — it is the reason the unit survives being knocked off a counter. A light body carries less momentum into the floor. It is also why the base can be a molded foot rather than a steel plate.

The imager is a 640 × 480 CMOS sensor with a 53 × 41 degree field of view, which is wider than the other readers in the range. A wider field means the code does not have to be centered on the window; it only has to be somewhere in it. On a crowded pharmacy counter where the assistant is holding a box in one hand and a bag in the other, that tolerance is the difference between a read and a re-present.

The unit runs in presentation mode by default: it illuminates and decodes continuously, so an item placed in front of it is read without pressing anything. That behavior is what makes it usable at a payment desk where nobody has a free hand.

Core specifications

Depth of field

Both ranges are quoted at 100% print contrast rather than 90%, which is why the number is shorter than on a comparable reader. In real use, a thermal label printed on a warm printer at 20% contrast will not reach 160 mm — it will read comfortably in the 60–100 mm band. Quote the specification to your customer, then set expectations with the 100 mm figure.

Symbologies

1D: UPC-A, UPC-E, EAN-8, EAN-13, JAN-8, JAN-13, ISBN, ISSN, Code 39 (full ASCII), Codabar (NW7), Code 128, EAN-128, Code 93, Interleaved 2 of 5, Addendum 2 of 5, IATA Code, MSI/Plessey, China Postal Code, Code 32 (Italian Pharmacode), RSS-14, RSS-Limited, RSS-Expand.

2D: QR Code, PDF417, Data Matrix, Aztec, MaxiCode, Dotcode, GS1 DataBar Stacked.

Dotcode is the unusual entry here. It is a sparse dot-matrix symbology used on high-speed production lines and on some tobacco and pharmaceutical tax stamps, where a conventional printed bar would not survive the process. Most general-purpose readers at this level skip it. If your account prints Dotcode, very little else in this class will read it.

Optical character recognition

Beyond barcodes, the reader can extract the machine-readable zone on Chinese resident identity cards and on several overseas national identity and travel documents. This is character recognition, not barcode decoding, so it is slower and more sensitive to lighting: a laminated card held flat under the window reads in well under a second, while a card at an angle or with a reflective laminate may need to be re-presented.

If identity capture is the primary requirement rather than an occasional convenience, say so before ordering — there are document-specific readers with controlled illumination that do the job more consistently than a general desk reader.

Presentation mode in practice

The reader decodes continuously and applies a duplicate-read window, so an item left under the sensor does not flood the POS with repeats. The window is configurable by barcode from the manual. Two things are worth knowing:

• Ambient light does not trigger a decode — the sensor looks for code structure, not brightness, so a white receipt under the window is ignored.
• The buzzer and LED confirm independently of the host, so a cashier knows a read succeeded even if the application is still processing.

Physical and electrical

Standby draw of 90 mA is high for a mains-powered device and irrelevant in that context — it only becomes a consideration if the reader is running from a battery-backed terminal, where the 100 mA gap between idle and active is worth accounting for in the runtime estimate.

Environment

Operating −20 °C to +60 °C, storage −40 °C to +70 °C, 5–95% relative humidity non-condensing, 2 m drop resistance, IP52, ESD ±8 kV direct discharge, ambient light 0–100,000 lux.

The 2 m drop rating assumes a hard floor, not tile over concrete with a gap underneath. Counter drops are what the rating is for; being thrown across a stockroom is not.

Interfaces

USB HID keyboard, USB virtual serial port, or RS-232, all from the same enclosure and selected by configuration barcode. Windows, iOS and Android hosts are supported. The USB variants take power from the host at 190 mA, well inside a standard port's budget.

Where it earns its place

• Pharmacy and clinic counters. Two code types in one pass — the retail EAN and the Data Matrix used for batch recall — plus identity capture at a window.
• Small convenience stores. The 100 mm depth leaves the counter usable, and 200 g means a knock does not end the shift.
• Franchise and payment desks. Presentation mode suits a counter where the operator has one hand occupied.
• Production and tax-stamp lines. Dotcode support is the reason to choose this model over its siblings.

What it will not do

No cordless operation. No Bluetooth. It reads at presentation range only, so it is the wrong choice for reading a label on a shelf two meters away. And the OCR capability covers identity documents; it will not read a handwritten invoice or a printed address block.

Compliance and ordering

CE to EN 55032:2015 and EN 55035:2017, EN 62368-1:2014+A11:2017, RoHS, BIS and FCC Part 15 Class B. SKU SN-HC666, interface specified at order. 1.8 m cable included, MOQ 1, 10–15 days standard, OEM branding from 50 units.

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