RDR2S-A and I8O4 Hardware Installation Description of Signals
24-10239-596 Rev. D
16
I8O4 Input/Output Points
Input Points
Description of Signals – The following are internally pulled up inputs:
• Terminal 1: IN1, IN2, IN3, IN4
• Terminal 2: IN1, IN2, IN3, IN4
• 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.
Open Collector Output Points
Description of Signals – The following are open collector outputs:
• Terminal 1: OUT1, OUT2
• Terminal 2: OUT1, OUT2
The allowable voltage range for these signals is 0-24VDC, limited to
50mA.
IMPORTANT: These open collector outputs can be damaged with the use of
alternating current (AC) potentials as low as 1VAC. The LED outputs can only
be connected to direct current (DC) loads up to 24VDC.
Reference – These signals are referenced to logic ground (COM).
Protection – Each signal has a 30V transient voltage suppressor between
it and system ground.
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