HT 644-01 Operating instructions Contents Page Unit structure Survey of functions Meaning of the unit buttons Volume settings Meaning of the LEDs Telephone operation Calling a user Accepting door calls Door release Transferring calls between two users Light switching Remote control functions...
Page 3
Operating instructions HT 644 - 01 SSS SIEDLE The HT 644-0 is a dialogue-oriented in-house telephone with a display for indication of all actions and responses. Operating errors and faults are indicated with the message "not possible xx". XX stands for an error code which is explained in the table on page 7.
HT 644-01 Survey of functions Meaning of buttons Using the key combination F and a number between 0 and 9, it is possible to activate remote control functions 0 - 9. Call inhibit on/off The software version, the logic address and the assigned number are displayed for around 2 secs.
Operating instructions Calling a user. In order to call a user, the receiver must be lifted and a call number with max. 4 digits dialled. If a series 44x or 54x unit is called, the following message appears for around 2 seconds: "Call to XXXX".
Page 6
Operating instructions A diverted call cannot be diverted to a further destination over again (please note: the call-diversion feature refers to a single-stage call diversion).
HT 644-01 Collective call If the unit is programmed for entitlement to transmit collective calls, a collective call can be started by actuating the key and 0. The collective call is terminated by replacing the receiver. If the unit is programmed for entitlement to receive collective calls, before a collective announcement a brief attention signal sounds and the message "Collective call from XXXX"...
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.
Page 9
Operating instructions The forwarding transaction cannot be deleted. A call-diversion transaction has been activated by the respective unit.
Page 10
Special electronicdepartement S. Siedle u. Söhne Telefon- und Telegraphenwerke Stiftung & Co Postfach 20 D78113 Furtwangen Bregstraße 1 Germany Telefon ++49 7723/63-378 Telefax ++49 7723/4573...
Need help?
Do you have a question about the HT 644-01 and is the answer not in the manual?
Questions and answers