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How Swept-RF Works?

2026-06-17

ALike other EAS technologies, swept-rf uses a transmitter to create a surveillance area where tags and labels are detected. The transmitter sends a signal that varies between 7.4 and 8.8 MHz (millions of cycles per second), which is why it is called swept; it sweeps over a range of frequencies.
The transmitter signal energizes the swept-rf tag or label, which is composed of a circuit containing a capacitor and an inductor or coil, both of which store electrical energy. When connected together in a loop, the components can pass energy back and forth or "resonate." The frequency at which the circuit resonates is controlled by matching the storage capacity of the coil and capacitor. The tag responds by emitting a signal that is detected by a receiver.In addition to the small tag signal, the receiver also responds to the much larger transmitter signal. By detecting a phase difference between these two signals, and other properties of the tag signal, the receiver recognizes the presence of a tag and generates an alarm.

Can the HA169 base station work normally if we connect it to the internet through a 4G/5G router with a SIM card and Ethernet LAN output?

How Electromagnetic Technology Works?

Related questions

Does the HPC168 bus passenger counter device support HTTP POST to a custom URL to send count data in real time？What is the data format sent - JSON or hexadecimal string?

The HPC168's RJ45 interface uses the HTTP POST method for uploading and retrieving data. The server response must specify UTF-8 encoding and disable the Accept-Charset response header. All POST field values are hexadecimal strings of the actual data.

Please refer to HPC168 protocol document for details, which contains complete parameter introductions and practical transmission examples for your integration testing.

Does the infrared people counter require good lighting conditions to work properly? Will dim or low‑light environments affect its counting accuracy?

The infrared people counter can work normally without ambient lighting. However, light sources such as sunlight and spotlights contain infrared components, which may interfere with counting accuracy. Turning off the lights only eliminates interference from indoor lamps, while sunlight causes particularly obvious interference.

Does the ESL electronic shelf labeling system work directly via Bluetooth from a mobile phone, or is a gateway / base station required?

Our ESL tags cannot run independently via direct Bluetooth connection from mobile phones, and a dedicated base station gateway is mandatory for full system operation.

All electronic shelf labels rely on the base station to receive data and synchronize display content from the management software. Without the supporting gateway, standalone price tags fail to receive update commands or function normally. This dedicated gateway design also stabilizes wireless communication across the whole supermarket environment.

Can a SIM card be inserted into the sensor of the HPC168 bus passenger counter?

The HPC168 passenger counter unit itself does not support SIM‑card functionality. It can connect to an external GPRS module via the RS485 protocol for network connectivity.

Can we order extra backup items together with the ESL price tag sample or future order?

Absolutely you can arrange extra backup items alongside your sample order or any subsequent formal bulk purchase of ESL price tags.

Please feel free to list required backup parts when confirming your order details. We will combine these spare goods into the same shipment to save extra delivery fees and streamline your receiving process efficiently.

Why is there a deviation between the data output by HPC015S Wi-Fi infrared counter and the actual on-site passenger flow during operation?

A certain margin of error in passenger counting data from infrared counters is inevitable. Since the device continuously accumulates statistical data, all minor errors will pile up over time. The longer the running duration, the larger the total accumulated error value, and the inaccuracy becomes especially prominent when calculating dwell number of people. Most customers primarily rely on this equipment for comparative trend analysis of passenger flow across identical periods.

If you require precise headcount statistics for people lingering within a designated area, we recommend switching to an AI people counter. AI people counter device identifies actual human figures within the target monitoring zone directly, delivering the highest counting accuracy.

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zhang@highlightesl.com

As a supplier with over 20 years of experience in the retail industry, we offer various intelligent solutions and products such as ESL (Electronic Shelf Label), EAS (Electronic Article Surveillance), and people counting (passenger counter) products.