Honeywell RK-MCU - Page 13

11
No.
Parts/Ports
Description
19
70V interface of
external power
amplifier
70V audio interface of external power
amplifiers includes CH1B IN, CH2A IN,
CH2B IN and the IN/OUT of spare amplifier.
20
MODE
DIP switch to set the work mode of current
device and system.
21
Calibration key
To calibrate speaker line impedance.
22
DC power output
24V DC power output.
23
System extension
interface
Zone expander connection.
24
Fan
Cooling fan controlled by temperature.
25
Backup power input
24 VDC backup power supply connection.
Note: This function is not applied in North
America.
26
Grounding screw
Grounding wire connection.