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
GM-160 Mini 23 × 20 mm UHF RFID Reader Module, 902–928 MHz, TTL
Stamp-sized 23 × 20 mm UHF RFID reader module for US-band (902–928 MHz) devices: 18–26 dBm, sensitivity below −85 dBm, TTL UART and a hardware watchdog.
- 23 × 20 mm (±1 mm) footprint for space-constrained OEM designs
- FCC 902–928 MHz band; EPC Gen2 / ISO 18000-6C
- 18–26 dBm output with ±1 dB accuracy and ±0.2 dB flatness
- Receiver sensitivity < −85 dBm; reads 915 MHz long-range UHF cards
- Hardware watchdog plus RF power-amplifier saturation monitoring
- Frequency
- 902–928 MHz (FCC)
- Output power
- 18–26 dBm
- Sensitivity
- < −85 dBm
- Interface
- TTL UART
- Power
- 4.5–5.5 V DC
- Dimensions
- 23 × 20 mm
Reply within 24 hours Tested before dispatch Worldwide shipping
Mini 23 × 20 mm UHF RFID Reader Module, 902–928 MHz, TTL: overview
The GM-160 is a mini UHF RFID reader module measuring just 23 × 20 mm (±1 mm), the smallest UHF reader board in our current range. It gives compact US-market devices, such as handheld scanners, desktop enrollment readers and locker controllers, an EPC Gen2 / ISO 18000-6C engine on a board about the size of a postage stamp.
Transmit power is set between 18 and 26 dBm, held to within ±1 dB of the setting with ±0.2 dB flatness across the band, and the receiver picks up replies weaker than −85 dBm. Firmware is tuned two ways: a multi-tag inventory algorithm for crowded fields, and a quick-response routine for the common case of one or two tags. 915 MHz long-range UHF cards are supported. Internally, a dual-processor layout handles tag polling and host output at the same time, while a hardware watchdog and RF power-amplifier monitoring protect against lockups and amplifier saturation.
This part is specified for the FCC 902–928 MHz band only, for the US, Canada and other regions that follow FCC rules. For ETSI 865–868 MHz projects, choose the dual-band GM-150 or the GM-140-EU instead.
Integration notes
Run the module from 4.5–5.5 V DC. The data sheet gives operating current as 300 mA–2.5 A, so size the regulator for the upper figure and measure actual draw on a sample. The host link is a TTL UART at 115200 bps (default) or 38400 bps. Rated operating temperature is −25 to +70 °C, with storage from −30 to +80 °C.
More features
- TTL UART at 115200 bps (default) or 38400 bps
GM-160 specifications
RF & protocols
| Frequency range | 902–928 MHz |
|---|---|
| Region | US, Canada and other regions following FCC rules |
| Air protocol | EPCglobal UHF Class 1 Gen 2 / ISO 18000-6C |
| Supported cards | EPC Gen2 tags, including 915 MHz long-range UHF cards |
| Output power | 18–26 dBm |
| Output power accuracy | ±1 dB |
| Output power flatness | ±0.2 dB |
| Receiver sensitivity | < −85 dBm |
Reliability
| Architecture | Dual CPU (tag polling and data output in parallel) |
|---|---|
| Supervision | Hardware watchdog; RF power-amplifier saturation monitoring |
| Algorithms | Multi-tag inventory; fast-response mode for few-tag scenes |
Interfaces
| Host interface | UART, TTL level |
|---|---|
| Baud rate | 115200 bps (default), 38400 bps |
Electrical
| Supply voltage | 4.5–5.5 V DC |
|---|---|
| Operating current | 300 mA–2.5 A (size supply for the upper figure) |
Mechanical & environment
| Dimensions | 23 × 20 mm (±1 mm) |
|---|---|
| Operating temperature | −25 to +70 °C |
| Storage temperature | −30 to +80 °C |
| Relative humidity | 5–85% (at +25 °C) |
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 |
|---|---|---|
| GM-160-US | Miniature module, US FCC band (902–928 MHz), TTL UART |
Where the GM-160 is used
- UHF engine for a compact handheld or pistol-grip scanner sold in North America
- Enrollment reader built into a front-desk terminal
- Smart locker or cabinet controller with little board space to spare
- Add-on UHF reader for an existing US-market IoT device
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.
GM-160 FAQ
Can I use the GM-160 in Europe?
No. It is specified for the FCC 902–928 MHz band only. For ETSI 865–868 MHz, use the dual-band GM-150 or the GM-140-EU.
How much board space does it need?
The module measures 23 × 20 mm (±1 mm). Request the pad layout with your sample before finalizing your PCB.
What supply should I design for?
A 4.5–5.5 V DC rail. Operating current is specified as 300 mA–2.5 A, so size the regulator for 2.5 A and confirm real consumption on a sample.
Which host interface does it use?
A TTL-level UART at 115200 bps by default, with 38400 bps selectable.
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.
Related products
GM-130
UHF RFID Reader Module, 33 dBm, UART/TTL, Single Port
Embeddable single-antenna UHF reader engine on the Impinj R2000: 0–33 dBm output, more than 700 tags/s and a 15-pin TTL UART header, in FCC and ETSI versions.
860–960 MHz (US or EU version)0–33 dBm1
Details →
GM-120
4-Port UHF RFID Reader Module, 33 dBm, UART/TTL
Four-antenna UHF reader engine on the Impinj R2000 for smart cabinets, shelf readers and portals: 0–33 dBm, 700+ tags/s, TTL UART, FCC and ETSI versions.
860–960 MHz (US or EU version)40–33 dBm
Details →
GM-110
8-Port UHF RFID Reader Module, 33 dBm, UART/TTL
Eight-antenna UHF reader engine on the Impinj R2000 for multi-shelf cabinets and tunnel readers: 0–33 dBm, 700+ tags/s, 1,000-tag buffer, TTL UART.
860–960 MHz (US or EU version)80–33 dBm
Details →
GM-150
US/EU Dual-Band UHF RFID Reader Module, 7–30 dBm, TTL
One UHF reader module for both 865–868 MHz and 902–928 MHz builds: 7–30 dBm output (±1 dB), sensitivity below −85 dBm, hardware watchdog and TTL UART.
865–868 MHz and 902–928 MHz7–30 dBm (±1 dB)< −85 dBm
Details →
GM-140
Ultra-Thin Low-Power UHF RFID Module, 18–26 dBm, TTL
50 × 50 mm integrated UHF RFID module for handhelds and desktop card issuers: 18–26 dBm, 100–250 mA, TTL UART, reads up to 3 m with no heatsink. US and EU versions.
902–928 MHz (US) / 865–868 MHz (EU)18–26 dBmUp to 3 m
Details →
LR-110
30 m Long-Range UHF RFID Reader for Parking, IP66
IP66 integrated UHF reader that identifies vehicle tags at up to 12 m (9 dBi) or 30 m (12 dBi), with Wiegand 26/34, RS485, USB and optional TCP/IP.
Up to 12 m (9 dBi) / up to 30 m (12 dBi)865–868 MHz (EU) or 902–928 MHz (US)Wiegand 26/34, RS485, USB; TCP/IP optional
Details →
LR-150
Standalone UHF RFID Access Controller, Bluetooth, IP66
IP66 all-in-one UHF reader and access controller: stores 5,000 users, controls the gate lock, opens by Bluetooth and reads tags at up to 10 m or 20 m.
5,0002–10 m (309 mm) / 10–20 m (445 mm)865–868 MHz (EU) or 902–928 MHz (US)
Details →
LR-140
20 m Long-Range UHF RFID Reader, 12 dBi, Wiegand & RS485
445 mm IP66 integrated UHF reader with a 12 dBi linear antenna that reads vehicle tags at 10–20 m and reports over Wiegand, RS485 or optional TCP/IP.
10–20 m865–868 MHz (EU) or 902–928 MHz (US)Wiegand, RS485; TCP/IP on -NET-BT
Details →
Get pricing for the GM-160
Send your card type, interface and quantity. You get a quote, lead time and compatibility notes within 24 hours — samples available for most items.