Access control applications
3.30 EST3 Installation and Service Manual
Multiple card readers
Description of the application
Several access control applications require the use of multiple
card readers. For example:
• Visitor and escort readers
• High and low position readers
The CRC lets you use multiple card readers of the same
technology or of mixed technologies. It can support up to four
card readers, provided that the total current draw of the readers
does not exceed the limits specified on the CRC installation
sheet.
A visitor and escort application using multiple card readers is
shown in Figure 3-10, below. In this application, both the escort
and visitor must badge in to gain access.
The escort has a permanent, plastic card, and uses the proximity
card reader. The visitor is issued an inexpensive paper bar code
card, and uses the bar code reader.
CRC
Bar code
card
reader
Proximity
card
reader
Power supply
Other factors
Hardware configuration
SDU programming
ACDB/KDC operation
X
X
Outside card readers
Bar code
card
reader
Proximity
card
reader
Inside card readers
X
Figure 3-10: Multiple card readers
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