Ok thank you for your comments I've inserted a zener diode between the ground and Rx pin to reduce the tension.
http://baseband-devel.722152.n3.nabble.com/file/n2983706/Motorola_T191_unloc...
-- View this message in context: http://baseband-devel.722152.n3.nabble.com/hmm-sorry-data-cable-question-tp2... Sent from the baseband-devel mailing list archive at Nabble.com.