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HID® Indala® Proximity™ Legacy ASR-503

125 kHz Proximity Mullion
HID Indala Proximity Legacy ASR-503

The Legacy Mullion proximity reader, formally known as the "ASR-503 SlimLine", is a member of Indala's proximity card and reader family. Designed to mount on metal door frame (mullion) or a flat surface, it is also suitable for locations that require a small footprint reader.

Key Features:

The single-piece Legacy Mullion Reader delivers read ranges up to 4 inches (10 cm) and operates from 4 to 16 VDC allowing for great flexibility in power supplies. In most cases, it can be powered directly from the access control panel. The electronics are sealed in a UL-approved epoxy potting material, making the reader vandal and weather resistant.


5.5”H x 1.7”W x 0.7”T (14.0 cm x 4.3 cm x 1.7 cm)

Read Range:

Up to 4”(10 cm) using FlexCardTM standard card

Input Voltage:

4-16 VDC at reader

Current Draw:

Off Metal: 65 mA @ 12 VDC

85 mA @ 5 VDC

On Metal: 76 mA @ 12 VDC

96 mA @ 5 VDC

Maximum: 88 mA @ 12 VDC

100 mA @ 5 VDC

Operating Temperature:

-31°F to +149°F (-35°C to +65°C)

LED Indicator:

Tri-color standard (red,green,amber)

Audio Tone:

Standard,independently controllable (not tied to LED function)

Output Formats:

Wiegand,ABA Track II Magnetic Stripe


125 kHz (excitation)

Read Time (26 bit):

200 ms (from read to data output)


Various levels (configurable)


Factory only (field programmability not available)

Other Features:

SelfTest,QuickFlash,and WatchDog

Part Number: