Grandstream GDS37XX-RFID-RD USB RFID Card Reader

The Grandstream GDS37XX-RFID-RD USB RFID reader is a desktop accessory for registering 125KHz EM4100 access cards into a site’s credential system before they are handed to a door station or an access-control panel. It plugs into a PC or laptop over USB and needs no driver installation, appearing to the operating system as a standard USB HID device, so a card’s identifier types out directly wherever the cursor is placed, in the same way a barcode scanner would. Housed in a compact square enclosure measuring 108.5mm x 108.5mm x 24mm, it sits on a desk at a reception or security office, or mounts on a wall near an enrolment station, and connects over a 1.5-meter USB cable. Within the GDS37 family, it is the companion tool to the GDS37XX-CARD card pack, used to read a new card’s ID before it is added to a door station’s whitelist.

How the Grandstream GDS37XX-RFID-RD USB RFID reader works

Reading distance is short by design, at 0 to 40 millimeters, which means an operator holds a card directly against or just above the reader rather than the device picking up nearby cards accidentally, useful when enrolling one card at a time at a busy front desk. The reader draws power entirely from the USB port at DC 5V with a ±4% tolerance, with a standby current of 20mA and an operating current under 35mA, low enough that it adds no meaningful load to a PC’s USB bus. It supports the 125KHz EM4100 RFID card protocol used by the GDS37XX-CARD pack and by the reader built into the GDS3710 door station, so a card enrolled through this desktop unit reads correctly at any 125KHz-compatible door on the same site.

Where it fits on a Saudi site

A dedicated enrolment reader suits any site issuing more than a handful of access cards, such as an office building, a residential compound, or a facility with staff turnover, where security or reception staff need to register new cards without walking to the door station each time. Because it requires no driver and works as a standard USB HID device, it can be set up on almost any Windows PC running the site’s access-control or visitor-management software without an IT support call. The desk or wall mounting option lets a site place it wherever card enrolment actually happens, whether that is a reception counter or a dedicated security office.

Positioning within the GDS37 family

The GDS37XX-RFID-RD is not a door station: it has no camera, no call button, and no outdoor rating, and its working temperature range of -10°C to 70°C and storage range of -20°C to 80°C reflect an indoor desktop accessory rather than a device meant for an exposed entrance. Its role in the family is administrative rather than physical access control, working alongside the GDS37XX-CARD card pack to get new 125KHz credentials into a system before a visitor ever reaches a GDS3710, GDS3725, or GDS3727 door station. Where those door stations combine a camera, a card reader, and a call button in one weatherproof unit, this reader does one job only, and does it from indoors.

Deployment notes

The unit measures 108.5mm x 108.5mm x 24mm with a ±3mm manufacturing tolerance, in a compact square form factor that sits flat on a desk without needing a stand. The 1.5-meter USB cable reaches a nearby PC tower or laptop port without an extension in most desk layouts, and because it draws power from the USB port itself, no separate power adapter or PoE injector is needed for this unit. Setup consists of plugging it in and confirming the operating system recognises it as a HID device; no software installation or driver download is required before the first card can be read, which makes fitting out several enrolment stations at once a quick job.