Telit Mobile Terminals S.p.A. SAT551 Manuel D’Utilisation

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The micro telephone is fitted with a 3 m wire for connecting it to the cradle 
via the 2.5 mm mono jack. When installing, position the microphone not 
further than 40 cm from the driver and secure it in position using the two-
sided tape or the bracket provided, which is to be screwed to the vehicle 
using the two screws provided in the pack. 

 
Connecting wires for the vehicle IO devices 
 

The wires connecting to the vehicle IO devices are attached to the cradle 

by a 6-pin connector.  

The purpose each wire serves is as follows:  
 
t     the red wire is to be connected to the car battery’s positive terminal 

(+12 V). 

 
Note: A 4 A retarded fuse must be placed in series with the red wire 
on the battery side. Should it fuse, it must be replaced with a similar 
fuse and you must have your car kit checked at an authorised service 
centre. 
 
t     The black wire must be connected to an earth point (e.g. an unpainted 

metal surface on the vehicle).  

t     The white wire must be connected to the vehicle‘s ignition. 
t     The blue wire must be connected to the feature for silencing the car 

radio (stereo mute). 

 
Stereo mute feature (depending on the car radio used) 
 

When the blue wire is connected to the radio in your vehicle, the automatic 

silencing feature silences the radio when a call is received. 

When making a call this feature is only activated after the telephone number 

has been dialled and the call has been started by pressing the 

s key, and a 

dial or engaged tone is established.