Interface between Ericsson 6xx/7xx phones and a PC


Posted on Mar 10, 2013

This interface is needed to connect the phone to a PC, because the PC`s serial port works with voltage levels between -12 and 12V (RS232 protocol) and the phone operates between 0 and 5V (TTL protocol). Don`t even think in conecting your phone directly to the serial port, this would certainly damage your phone and/or the PC serial port!!! The interface main component is IC1 - MAX232, a common IC in RS232 - TTL interfaces, with some external components wich are needed for the IC to work correctly. The main difference between this and other interfaces is the S1 switch and the phone System Connector. To get more info about the System connector, like pin.out, go to the pin-out page.


Interface between Ericsson 6xx/7xx phones and a PC
Click here to download the full size of the above Circuit.




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