ranadala
Newbie level 3
i use max 232 to communicate with gsm module GM47.
There is level different between them. max 232 serve 0-5V and GM 47 serve 0-3V.
First i use level shifter using bjt shifter to step-down from max232 to GM47
and bjt shifter to step-up from GM47 to max232 but fail in hyperterminal looping test.
Then i use buffer uln 2803 to step-down but direct connection to step-up because
level 3V is still valid for max232, but then hyperterminal test is still fail.
Pease help me
There is level different between them. max 232 serve 0-5V and GM 47 serve 0-3V.
First i use level shifter using bjt shifter to step-down from max232 to GM47
and bjt shifter to step-up from GM47 to max232 but fail in hyperterminal looping test.
Then i use buffer uln 2803 to step-down but direct connection to step-up because
level 3V is still valid for max232, but then hyperterminal test is still fail.
Pease help me