18
Rear Panel
No.
Parts/Ports
Description
1
MIC volume
To adjust the volume of the microphone.
2
Line volume
To adjust the volume of the line input.
3
Loudspeaker volume
To adjust the volume of the loudspeaker.
4
Line input
This port can be connected to an external audio device, such as
a CD/DVD player, tuner, etc.
5
Debug interface
To upgrade the firmware.
6
Address
The DIP switch is used to set the address of remote call
stations for communication, which ranges from 1 to 6. This
device has a built-in 120
resistor for the CAN bus, the 4th
switch is to set the end resistor. Only the end device on the bus
can be set to connect to the end resistor.
7
Up link
To connect to the RK-MCU or previous remote call station.
8
Down link
To connect to the next remote call station.
9
Power adapter interface
It is used to supply the power by connecting to an external
power adapter in case
the device can’t be powered by RK-
MCU.
Technical Specifications
Parameters
Values
Power supply
24V DC
Power consumption
10 W
Microphone
Sensitivity
-50dB±3dB
SNR
60dB, A-weighted
Optimal pickup distance
10
～
20cm
Line Input
Input signal
1V(0dBV)
Input impedance
10 KΩ
Frequency response
80Hz-18kHz, ±3dB
SNR
>85dB, A-weighted
THD
<0.1%
Others
Built-in loudspeaker
2W/8Ω
Working Conditions
