7
Operating instructions
Additional functions by means of the MFM-611-10 unit
Remote-control functions, subscriber numbers, and switching functions can be assigned to the MFM keys
of the HT-644 module. Furthermore, in order to extend the functionality of this module relevantly,
additional functions can be assigned to the MFM keys as well.
Please, find below a list of the additional functions which can be programmed to any arbitrary MFM key.
(For further information, please refer to the respective "Programming instructions".)
Clearing the voice circuit
In order to carry-out a forced clearing of any voice circuit, apply this function.
Fire-alarm function
In order to activate, or de-activate, any fire alarm, apply this function.
Activating the output 12
In order to activate the output 12 of any internal telephone for three seconds, press any MFM key. (Key
function). In order to switch one potential-free contact, employ the AR-85911 module.
Active/passive mode (HTZ function)
In order to make possible that the internal telephone can be switched into the “Active” state, and switch
all the other internal telephones into the “Passive” state, first program a MFM key regarding the execution
of this function. Then, press this key. When being switched into the active state, the internal telephone
will react to the address 1 and the programmed address as well. When being switched into the passive
state, the internal telephone will react to the programmed address only. However, when switched in
connection with an HTZ-442 module, this internal telephone can be employed as a slave central-position
as well.
Error code table
Instructions which cannot be carried out or operating errors are indicated by the message:
"Not possible XX" and a number.
The table below provides an explanation for the indicated error codes
1This unit has already been switched as the target of a "Call diversion" transaction. Any further call-
diversion transaction will not be possible.
2A call-diversion transaction has already been activated at this unit. Any further call-forwarding
transaction will not be possible.
3A call-forwarding transaction has already been activated at this unit. Any further call diversion will
not be possible.
4There are no subscribers existing which have desired any call-forwarding transaction.
5No request for a call-diversion transaction to any subscriber is existing.
6Forwarding is not possible because both users have a loudspeaking function
7Forwarding is not possible, both speechpaths are engaged
8It is not possible to transfer to a user which is already engaged.
9The function Light ON was not executed. F__0 has not been acknowledged.
10The alarm initiated at HT has not been acknowledged.
11The entered remote control function has not been acknowledged.
12The door release has not been activated.
13Any call-diversion transaction to the subscriber’s own subscriber number will not be possible.
14Any call-forwarding transaction to a subscriber with an active call-diversion transaction will not be
possible.
15The entered switching function has not been acknowledged.
16A door call from an STM or a non-callable TL 545 cannot be forwarded.
17The Doormatic function has not been activated. May be, it has not been enabled yet.
18One porter function has been activated. The activation of a call-diversion transaction will not be
possible.
19The porter function has not been acknowledged. May be, it has not been enabled yet.