Aiphone AI-900 - Manual (Page 25)

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12.3.2. External recording device and AI-900MS connection
An external recording device can be connected to each master station line.
[Connection]
To connect the external recording device, use a twisted pair cable for voice output, and a twisted pair cable for
control output. The voice output is 0 dB* and of unbalanced type. The control output is an open collector
output 20 mA, 24 V DC max. Connect as shown below.
*0 dB = 1 V
External recording device and AI-900MS connection
2 twisted pair cables
2 twisted pair cables
HOT
GND
HOT
GND
HOT
GND
HOT
GND
AI-900MS
CN1
CN2
CN3
CN4
Line 1 for
recording
Line 2 for
recording
To voice input (HOT)
To voice input (GND)
To recording start input (HOT)
To recording start input (GND)
Recording device
Recording device
Voice output
Control output
Voice output
Control output
Front view of
the circuit board