Hardware Installation Guide for the Polycom SoundStructure C16, C12, C8, and SR12
IR Receiver
The IR receiver port on the
PIN 2: TXD
PIN 3: RXD
PIN 5: GRO
PIN 7: CTS
PIN 8: RTS
OUT IR 12V 
The IR receiver port accepts a standard 3.5 mm terminal block which should be terminated to the IR receiver as shown in the following figures.
Pin
1
2
3
Top View
1
2
3
Signal
+12 V
Ground
IR Signal Data
RS-232
The
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Pin 9 Pin 6
3 - 6