RDR2S-A and I8O4 Hardware Installation Description of Signals
24-10239-596 Rev. D
14
RDR2S-A Input Points
Wiegand Input
Description of Signals – DATA0/RS485- and DATA1/RS485+ from each
reader, complying with the Wiegand interface specification. These
signals are pulled up to 5VDC by internal 3.92 K Ohm resistors when the
Wiegand/RS485 switch is on. When the Wiegand/RS485 switch is off,
these signal lines are compatible with RS485 communications. See
page 24 for information on Wiegand/RS485 switch settings.
Reference – These signals are referenced to logic ground (COM).
Protection – Each signal has a 6 V transient voltage suppressor between it
and COM.
Input Points
Description of Signals – The following are internally pulled up inputs:
• Reader 1 Door Contact
• Reader 1 REX
•Reader 1 Tamper
• Reader 1 Spare
• Reader 2 Door Contact
• Reader 2 REX
•Reader 2 Tamper
• Reader 2 Spare
• Panel Power Fail
• Panel Tamper
The allowable voltage range for these signals is 0-12VDC.
Reference – These signals are referenced to their associated COM input.
Protection – Each signal is protected with series resistors and dual
clamping diodes.
External Circuits – Two external resistors and switch circuit connected
between an input point and COM is required for 4-state operation. An
external switch connected between an input point and COM is required
for 2-state operation. For wiring details see Wiring Input Devices on
page 21.
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