UHF RFID for Warehouses, Dock Doors & Portals
Plan RFID for warehouse management: fixed readers and circular antennas at dock doors, conveyor tunnels, handheld cycle counts and on-metal asset tags.
ValenID · valenid.com · sales@valenid.com
FX-120 4-Port Fixed UHF RFID Reader, TCP/IP & RS232, GPIO
Four-antenna fixed UHF RFID reader for dock doors, portals and cabinets, with Impinj R2000 chip, 20–33 dBm output, RS232, TCP/IP and 2-in/2-out GPIO.
- Four antenna ports for dock doors, portals and small cabinets
- Impinj Indy R2000 chip, dual-CPU design, 20–33 dBm with ±0.2 dB flatness
- 700 tags/s peak inventory, 1,000-tag buffer, RSSI on every read
- Reads EPC Gen2 / ISO 18000-6C and ISO 18000-6B tags
- TCP/IP and RS232 host links plus 2 inputs and 2 outputs (≤ 12 V)
- Antenna ports
- 4
- Frequency
- 865–868 MHz (EU) or 902–928 MHz (US)
- RF output
- 20–33 dBm
- Interfaces
- RS232, TCP/IP, 2 GPI / 2 GPO
- Inventory speed
- 700 tags/s peak
- Power
- 12–18 V DC
Reply within 24 hours Tested before dispatch Worldwide shipping
4-Port Fixed UHF RFID Reader, TCP/IP & RS232, GPIO: overview
The FX-120 is a four-port fixed UHF RFID reader sized for the most common portal jobs: a warehouse dock door, a shipping or receiving gate, a retail back-door portal or a cabinet with a handful of shelves. Four external antennas are polled in turn at a minimum of about 25 ms each, so a complete cycle over all four ports takes around 100 ms.
Inside is an Impinj Indy R2000 reader chip with a dual-CPU design. Output power ranges from 20 to 33 dBm with ±0.2 dB flatness, sensitivity is better than –85 dBm, and the reader inventories up to 700 tags per second at peak. It buffers 1,000 tags (96-bit EPC), reports RSSI with every read and supports both EPC Gen2 (ISO 18000-6C) and ISO 18000-6B, switching between them as needed.
The host link is TCP/IP or RS232. For portal logic, the 8-pin GPIO connector offers two polarized inputs for photo-eyes, light curtains or door contacts, and two non-polarized outputs for signal towers or PLC inputs, all rated up to 12 V. Multi-point temperature sensing and dual-backup power calibration are built into the board.
Integration notes
Power the reader from 12–18 V DC; it draws under 70 mA in standby and under 100 µA in sleep. The enclosure measures 200 × 190 × 30.8 mm, weighs about 1.8 kg and is air-cooled for –20 to +55 °C operation. Choose the EU 865–868 MHz or US 902–928 MHz version to suit the site, and quote antennas and cables together so cable lengths match the door layout.
More features
- EU 865–868 MHz and US 902–928 MHz versions, 12–18 V DC supply
FX-120 specifications
RF & tags
| Reader chip | Impinj Indy R2000, dual-CPU architecture |
|---|---|
| Air protocols | EPCglobal UHF Class 1 Gen 2 / ISO 18000-6C and ISO 18000-6B (switchable) |
| Frequency | 865–868 MHz (EU versions); 902–928 MHz (US versions) |
| Regional frequency plans | FCC (US, Canada); ETSI EN 302 208 with and without LBT; Japan, Korea, Malaysia, Taiwan |
| RF output power | 20–33 dBm |
| Output power flatness | ±0.2 dB |
| Receive sensitivity | < –85 dBm |
| Antenna ports | 4, polled in sequence; minimum about 25 ms per antenna |
| Peak inventory speed | 700 tags/s |
| Tag buffer | 1,000 tags at 96-bit EPC |
| Tag RSSI | Supported |
Interfaces
| Host interfaces | RS232, TCP/IP (Ethernet) |
|---|---|
| GPIO | 2 inputs, 2 outputs, ≤ 12 V (see pin table) |
Electrical
| Supply voltage | 12–18 V DC |
|---|---|
| Standby current | < 70 mA |
| Sleep current | < 100 µA |
Mechanical & environment
| Dimensions | 200 × 190 × 30.8 mm (±5 mm) |
|---|---|
| Weight | 1.8 kg |
| Cooling | Air cooling |
| Operating temperature | –20 to +55 °C |
| Storage temperature | –20 to +85 °C |
Variant matrix
| SKU | Antenna ports | Band | Host interfaces |
|---|---|---|---|
| FX-120-4P-EU | 4 | 865–868 MHz (ETSI) | RS232, TCP/IP, GPIO |
| FX-120-4P-US | 4 | 902–928 MHz (FCC) | RS232, TCP/IP, GPIO |
GPIO pin definition
| Pin | Function | Electrical notes |
|---|---|---|
| PIN 1 | GPIO 1 input + | Inputs: ≤ 12 V between pins 1–2 and 3–4, polarized, 470 Ω equivalent LED resistance, response ≤ 150 µs |
| PIN 2 | GPIO 1 input − | |
| PIN 3 | GPIO 2 input + | |
| PIN 4 | GPIO 2 input − | |
| PIN 5 | GPIO 4 output | Outputs: ≤ 12 V across pins 5–6 and 7–8, non-polarized, 110 Ω on-resistance, response ≤ 6 ms |
| PIN 6 | GPIO 4 output | |
| PIN 7 | GPIO 3 output | |
| PIN 8 | GPIO 3 output |
Inputs accept up to 12 V and are polarized; outputs switch up to 12 V and are non-polarized.
Specifications can change between production batches. Confirm the current revision with us before placing volume orders.
Ordering options
Quote the SKU that matches your frequency, interface and mounting. Not sure? Send us your controller model and we will pick the variant for you.
| SKU | Configuration | Actions |
|---|---|---|
| FX-120-4P-EU | 4 antenna ports, 865–868 MHz, RS232 + TCP/IP + GPIO, unbranded housing | |
| FX-120-4P-US | 4 antenna ports, 902–928 MHz, RS232 + TCP/IP + GPIO, unbranded housing |
Where the FX-120 is used
- Warehouse dock door with two to four antennas on the door frame
- Shipping and receiving gate that confirms tagged pallets against the order
- Retail stockroom portal counting tagged goods between back room and sales floor
- Asset cabinet or cage with an antenna per compartment
RFID Asset & Tool Tracking
Build an RFID asset tracking system: on-metal, ceramic and tie-on tags matched to each asset, handheld audits, smart cabinets and IP67 HF heads for tooling.
FX-120 FAQ
Is four ports enough for a dock door?
Usually yes. Most dock doors use two to four antennas, and at a minimum of about 25 ms per port the reader completes a four-antenna cycle in roughly 100 ms.
How do I start reading only when a pallet passes?
Connect a photo-eye or light curtain to one of the two GPIO inputs (up to 12 V) and use it as the read trigger in your software; an output can then drive a signal light.
Which host interfaces are available?
TCP/IP over Ethernet and RS232. The reader buffers up to 1,000 tags with 96-bit EPC for the host to collect.
Can I move to more antennas later?
For more read points, the FX-110 offers eight antenna ports with the same RF specification, interfaces and footprint.
Before you buy
Related buyer guides
UHF RFID Frequency by Country: 902–928 MHz vs 865–868 MHz and Other Bands
Compare UHF RFID reader bands by country, including US, EU, UK, China, India and Japan. Understand ERP, EIRP, channel conditions and radio approvals.
How to Wire a Long-Range UHF Reader to an Access Controller or Barrier
Wire a UHF reader's D0, D1 and ground to your controller, match 26/34-bit Wiegand, size 12 V power and trigger the barrier by relay. Diagrams included.
Does RFID Work on Metal? How to Choose On-Metal Tags
Yes, RFID works on metal with tags built for it. See why metal detunes standard tags, compare ABS, PCB, ceramic and label tags, and test read range properly.
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