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-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.
- Eight antenna ports on one Impinj R2000 board with dual-CPU design
- 0–33 dBm adjustable output; receiver sensitivity < −85 dBm
- More than 700 tags/s peak with a 1,000-tag buffer (96-bit EPC)
- Tag RSSI, antenna-connection protection and temperature monitoring
- EPC Gen2 / ISO 18000-6C plus full ISO 18000-6B read/write
- Frequency
- 860–960 MHz (US or EU version)
- Antenna ports
- 8
- Output power
- 0–33 dBm
- Interface
- TTL UART
- Inventory speed
- > 700 tags/s
- Dimensions
- 69.5 × 91 × 7.8 mm
Reply within 24 hours Tested before dispatch Worldwide shipping
8-Port UHF RFID Reader Module, 33 dBm, UART/TTL: overview
The GM-110 is an 8-port UHF RFID reader module for OEM builds that must watch many read zones from one board: multi-shelf smart cabinets, conveyor tunnels, tool cribs and dock-door frames with antennas on both posts and overhead. Eight antenna ports on a single Impinj R2000 board mean fewer reader boards to buy, wire and power per installation, and your host controls everything over a TTL UART.
RF performance is that of a full 33 dBm reader: output adjustable from 0 to 33 dBm, receiver sensitivity below −85 dBm, more than 700 tags per second at peak and room for 1,000 tags (96-bit EPC) in the on-board buffer, so a burst of reads from a busy tunnel can wait until the host collects it. Where neighboring readers share the space, switch to dense-reader mode. RSSI per tag, antenna-connection protection and ambient temperature monitoring are built in, and the full ISO 18000-6B command set is implemented next to EPC Gen2 / ISO 18000-6C.
GM-110-8P-US is the FCC version for 902–928 MHz markets; GM-110-8P-EU is the ETSI EN 302 208 version for 865–868 MHz markets. The transceiver itself spans 860–960 MHz.
Integration notes
At 69.5 × 91 × 7.8 mm this is the largest board in the series, so leave room for the external heatsink it needs for air cooling. Budget 1.2 A (±10%) from a 3.7–5 V DC supply. The 15-pin header keeps the signal assignment of the 1-port and 4-port modules: TTL UART at 115200 bps (38400 bps optional), two 3.3 V inputs, two 3.3 V outputs, a buzzer driver, an active-high enable and an RS485 direction-control line. An SDK is available.
More features
- TTL UART at 115200 or 38400 bps; 2 GPI + 2 GPO at 3.3 V
- 69.5 × 91 × 7.8 mm; US (FCC) and EU (ETSI) versions
GM-110 specifications
RF & protocols
| Reader chipset | Impinj R2000, dual-CPU design |
|---|---|
| Frequency range | 860–960 MHz |
| Order versions | US: FCC 902–928 MHz; EU: ETSI EN 302 208 865–868 MHz (with or without LBT) |
| Other region plans listed | China, Japan, Korea, Malaysia, Taiwan |
| Air protocols | EPCglobal UHF Class 1 Gen 2 / ISO 18000-6C; ISO 18000-6B (full read/write) |
| Output power | 0–33 dBm, adjustable |
| Receiver sensitivity | < −85 dBm |
| Antenna ports | 8 |
Performance
| Read range | 5 cm – 20 m, depending on antenna and tag |
|---|---|
| Peak inventory speed | > 700 tags/s |
| Tag buffer | 1,000 tags @ 96-bit EPC |
| Work modes | Single-reader / dense-reader |
| Built-in diagnostics | Tag RSSI, antenna-connection protection, ambient temperature monitoring |
Interfaces
| Host interface | UART, TTL level (15-pin header) |
|---|---|
| Baud rate | 115200 bps (default), 38400 bps |
| GPIO | 2 inputs + 2 outputs, 3.3 V level |
| Buzzer output | Driven, > 50 mA |
| RS485 | Direction-control pin for an external transceiver |
| USB pins | Factory test only |
| Development | SDK available |
Electrical
| Supply voltage | 3.7–5 V DC |
|---|---|
| Operating current | 1.2 A ±10% |
Mechanical & environment
| Dimensions | 69.5 × 91 × 7.8 mm |
|---|---|
| Cooling | External heatsink, air-cooled |
| Operating temperature | −15 to +55 °C |
| Storage temperature | −20 to +70 °C |
| Relative humidity | 15–90% |
15-pin host header pin definition
| Pin | Signal | Function |
|---|---|---|
| 1 | GND | Ground (connect both GND pins) |
| 2 | GND | Ground |
| 3 | VCC 3.7–5 V DC | Supply input (connect both supply pins) |
| 4 | VCC 3.7–5 V DC | Supply input |
| 5 | GPIO 3 | Output (3.3 V level) |
| 6 | GPIO 4 | Output (3.3 V level) |
| 7 | GPIO 1 | Input (3.3 V level) |
| 8 | BUZZER | Driven buzzer output, > 50 mA |
| 9 | UART_RXD | Serial data in, TTL level |
| 10 | UART_TXD | Serial data out, TTL level |
| 11 | USB_DM | USB D−, factory test only |
| 12 | USB_DP | USB D+, factory test only |
| 13 | GPIO 2 | Input (3.3 V level) |
| 14 | EN | Module enable, active high |
| 15 | GPIO 5 | Direction control for an external RS485 transceiver |
Same header on the 1-, 4- and 8-port versions. Tie both GND pins to ground and both supply pins to the 3.7–5 V rail.
Order codes
| SKU | Antenna ports | Band / regulation | Host interface |
|---|---|---|---|
| GM-110-8P-US | 8 | FCC, 902–928 MHz | TTL UART |
| GM-110-8P-EU | 8 | ETSI EN 302 208, 865–868 MHz | TTL UART |
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-110-8P-US | 8-port module, US FCC band (902–928 MHz), TTL UART | |
| GM-110-8P-EU | 8-port module, EU ETSI band (865–868 MHz), TTL UART |
Where the GM-110 is used
- Smart cabinet with up to eight shelf or door antennas on a single reader board
- Conveyor tunnel reading cartons from several sides at once
- Dock-door frame with antennas on both posts and overhead
- Laundry sorting station reading tagged garments in bulk
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.
RFID Laundry & Linen Tracking
RFID linen tracking hardware: washable UHF laundry tags, fixed tunnel readers, antennas and handhelds for hotels, hospitals and laundries. Samples available.
GM-110 FAQ
When should I choose the GM-110 instead of the 4-port GM-120?
Choose it when one board must serve more than four antennas. RF and electrical specifications are the same (0–33 dBm, 1.2 A at 3.7–5 V DC); the GM-110 board is larger at 69.5 × 91 × 7.8 mm versus 67.5 × 51 × 8.2 mm.
How much power and cooling does the GM-110 need?
Plan for 3.7–5 V DC at 1.2 A (±10%) and mount the board on an external heatsink, which it relies on for air cooling.
How many tag reads can it hold before the host collects them?
The on-board buffer stores up to 1,000 tags with 96-bit EPCs, and peak inventory speed is above 700 tags per second.
Which UHF standards does it support?
It handles EPC Gen2 (ISO 18000-6C) tags and implements the full ISO 18000-6B read/write command set. The radio covers 860–960 MHz, sold as US (FCC) and EU (ETSI) versions.
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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Get pricing for the GM-110
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