Access Control Systems

Chase, SP4511A, ASR-503 Proximity Reader

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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


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