RFID reader Promag GP20 125 kHz EM4102 — 125 kHz EM4102 proximity reader, serial interface

Promag GP20 is a compact 125 kHz EM4102 RFID proximity reader engineered for reading low-frequency EM4102 tags and cards. The device supports contactless identification at distances up to 20 cm and is supplied with an open cable end for flexible connection. It is suitable for integration with access control systems, time-and-attendance solutions, and basic asset tracking where short-range tag reading is required.

Advantages

The reader offers support for EM4102 125 kHz tags, multiple interface outputs including RS232 and Wiegand, and a built-in MSR ABA Track 2 magnetic stripe reader. Its small dimensions (43 × 15 × 78 mm) and open cable end simplify installation and wiring in tight spaces. The contactless reading capability up to 20 cm provides reliable identification for typical proximity applications.

Suitable for

• Access control doors and turnstiles
• Time and attendance terminals
• Simple asset tracking systems
• Integration with controllers via RS232 or Wiegand

Key specifications

• RF frequency: 125 kHz (EM4102)
• Read range: up to 20 cm (contactless)
• Interfaces: RS232, Wiegand
• Magnetic stripe: MSR ABA Track 2
• Dimensions (W×H×D): 43 × 15 × 78 mm
• Cable: open cable end
• Brand: Promag, MPN: GP20-10, EAN: 5711045706462

How to use

Connect the open cable end to the target controller or interface module according to the controller wiring diagram and the reader pinout. Configure the controller to accept Wiegand or RS232 input as required by your system. Place EM4102 tags or cards within the specified range (up to 20 cm) in front of the reader for reliable identification. If using the magnetic stripe function, swipe cards following the MSR ABA Track 2 orientation.

Usage recommendations

Install the reader in a sheltered location away from strong electromagnetic interference and metal obstructions to maintain stable read range. Verify wiring and interface settings before commissioning and test with sample tags and cards representative of those used in the installation.