Security Brands 21-002 Wiegand Extender
The Security Brands 21-002 is a Wiegand signal extender used when a reader, keypad, or Wiegand credential device must be located farther from the controller than a standard installation comfortably allows. In gate work, this often comes up when the reader pedestal is at the entrance lane but the controller is mounted inside a building, gate house, equipment cabinet, or access-control panel some distance away. The 21-002 does not make an incompatible reader compatible and does not convert credential formats. Its job is to help carry the Wiegand communication path between the controller and the Wiegand device. The important installation details are wiring order, wire gauge, polarity, and terminal matching. Wiegand terminals are not labeled the same way on every reader or controller, so the original wiring diagram must be used before landing Data 0, Data 1, 12V, ground, LED, or hold conductors.
Compatible With
- Wiegand card reader and access-control controller installations needing extended distance
- Security Brands Ascent and Edge systems when using compatible Wiegand reader wiring
- SecurePass, HID, Secura Key, AWID, keypad, and proximity reader installations that output standard Wiegand and are wired within the extender limits
- Remote gate pedestals, card-reader posts, guard house reader locations, and access-control cabinets
- Wiegand devices with Data 0 and Data 1 wiring where the device manual supports the connection
- Not a format converter, relay module, gate operator control board, receiver, or credential reader
Features & Specifications
| Manufacturer | Security Brands / American Access Systems |
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| Product Type | Wiegand signal extender |
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| Part Number | 21-002 |
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| Application | Extends Wiegand device range between controller and reader |
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| Maximum Range Reference | Up to 500 ft where installed according to instructions |
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| Recommended Wire | 14 to 22 AWG wire referenced in instructions |
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| Power | No additional power required per manufacturer instructions |
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| Connections | +12V, GND, LED, HOLD, Data 0, Data 1 terminals as applicable |
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| Notes | Terminals vary by reader/controller manufacturer |
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Also Known As / Related Part Numbers
- 21-002
- SB-21-002
- Security Brands 21-002
- AAS 21-002
- Wiegand Extender
- Wiegand Signal Extender
- I-21002-EN instructions
- Wiegand reader extender
- Access-control reader distance extender
Technician Note
A Wiegand extender can help with distance, but it will not fix an incorrect format, reversed Data 0/Data 1 pair, poor grounding, damaged cable, or a reader that is not powered correctly.
Before Ordering
- Confirm the problem is Wiegand distance or signal integrity, not a credential-format issue.
- Confirm the reader and controller use Wiegand wiring.
- Review the reader and controller diagrams before landing terminals.
- Use appropriate low-voltage cable and keep runs away from high-voltage noise where possible.
- Do not use this as a relay output extender or radio receiver replacement.
Professional Advisory
Low-voltage access-control wiring should be handled by a qualified technician when the run is long, shares conduit, or passes near high-voltage equipment. Follow the reader and controller manuals for exact wiring.
Product Q&A
What does the 21-002 Wiegand Extender do?
It extends the Wiegand signal path between a Wiegand reader or device and the access-control controller.
Does it convert one credential format to another?
No. It does not convert HID, Secura Key, AWID, SecurePass, or other formats. It only helps carry the Wiegand signal.
How far can it extend a Wiegand device?
Security Brands instructions reference extending Wiegand devices up to 500 feet when installed correctly.
Does the extender need a separate power supply?
Manufacturer instructions state that no additional power is required.
What wiring should be checked?
Check Data 0, Data 1, +12V, ground, LED, and hold terminals against the reader and controller manuals.
