Insys Modem 56k 4.1 m/UL 11-02-01-01-40.022 Manuale Utente

Configuration 

 

INSYS Modem 56k UL

 

18   Juni 

05

 

The voice mode of the modem allows  

• 

to digitize telephone audio data and to transmit them over the serial line 

• 

to play back digitized audio data to the telephone line 

• 

to transmit and receive control signals as DTMF 

Keyboards of fixed network and mobile telephones produce DTMF sounds for the charac-
ters (0..9, A..D, *, #) as a combination of two frequencies which do not occur in the human 
voice. 
DTMF sounds are used for dialing in the telephone network. They may be used as well to  
transmit control signals during a voice connection – e.g.  for answering machines or 
telebanking. 

The latest firmware updates for INSYS Modem 144/336/56k 4.0 from January 2003  al-
low to set the control outputs and to query the status of the alarm inputs by DTMF sig-
nals. The INSYS Modem is ready to receive DTMF signals in incoming calls when the 
DTMF mode has been activated. The connect is indicated by the OK signal and must be 
answered by a 4 digit PIN. The PIN is acoustically acknowledged. 

The following commands are available for remote DTMF control by telephone keyboard: 

Close connection 

Control output 1: 

x: 

1 

set control output 1 to 1 

 

0 

reset control output 1 

Return: „OK“ 

Control output 2: 

x: 

1 

set control output 2 to 1 

 

0 

reset control output 2 

Return: „OK“ 

Status query of both alarm inputs: 

Status of both inputs is indicated in the form of HIGH (not active) or LOW (active). 

Return: „OK“ – Status Input 1 – Status Input 2 

The connection is closed by the INSYS Modem after a idle time of 25 seconds without 
further DTMF signals.