Intercom Central FM246 User Manual Download Page 8

Using the Function Keys: 

Volume: 

Press the + to increase the volume and a beep corresponding to the audio 
level will sound every time when the + is pressed.  

Press the 

 to decrease the volume and a beep corresponding to the 

audio level will sound every time when the - is pressed.  

The beeps will stop after the level reaches the max & the min. 

LOCK: 

Press the 

LOCK

 button to engage into 

monitor mode

.  In the monitor 

mode the system is constantly on.  

We have replaced 

voice activation

 with constant on. There is no need 

to raise your voice to activate the mode anymore. Constant-on eliminates 
such problems like 

missing the first part of the conversation

 which is a 

common defect among 

voice activation

 design.  It also eliminates the 

problem of not triggering the 

voice activation

 if the sound is not loud 

enough. Only one party is able to engage in the monitor mode at any given 
time. To talk to the party being monitored, the LOCK button at the 
monitored unit must be disengaged. Depress the LOCK button or pressing 
any function button will de-activate the LOCK mode.  

TALK: 

Press the 

TALK 

button to initiate a conversation. Depress the button to 

wait for the reply. 

CALL: 

Press the 

CALL

 button to "ring" your intended party. A ring tone is 

generated to the intended party that you are calling. Depress the button to 
terminate the ringing. 

Standby: 

Idling all function buttons (LOCK, TALK, and CALL) will put the system 
into a standby mode such as waiting for incoming communication 

6

Using The Channel Keys & Channel Setup 

Set all units to the same  channel for Pan-Paging Communication Mode. 

Functionality: 

Any time when the LOCK, TALK & CALL function is pressed, the 
conversation will be sent to all units on the same channel. 

Recommended Usage: 
1) Use in a  PA  system setup
2) Baby monitor  throughout the whole  system 

Dedicated Communication: 

Set each unit  to different channels  for designated communication  

Functionality: 
Any time when the LOCK, TALK & CALL button is pressed, the 
conversation will only be sent to the unit that is on that  designated 
channel. 

Recommended Usage: 
For different parts of the household or different departments in the 
business 

Mixed Mode Communication: 

Set some units on the same channel, while the remaining units on 
different Channels. 

Functionality: 

Any time when the LOCK. TALK & CALL button is pressed, the 
conversation will be sent to designated unit on the same channel. When 
the conversation is ended, you can  go back to monitoring channel. 

Recommended Usage: 

Set one unit in monitor mode on one channel. Set all remaining units to 
other designated channels. From any of the remaining units, you can 
switch the channel back and forth & use the system as monitors and 
designated communicators. 

7

Pan-paging Communication:

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