Ok here is what I need to do... I must use the palm pilot to emulate a security system keypad... In the security system... the keypad is slave so it listen on the BUS using I2C Bus protocol, to receive lit leds and to input pressed keys.
I must plug the palm pilot serial to the security system bus and emulate the keypad.. To do so... I must be able to listen on the BUS to syncronise... The syncronisation mechanisim is simple... On the I2C Bus protocol there is two wire DATA and CLOCK I must listen on the Clock... when I catch a 32 ms delay between impulse This means Im at the begining of the sequence.. so now Im synchronise. Now each 25 ms the impulse change ( 1 to 0 or 0 to 1 ) I must then Listen if an impulse(1) last more than 25 ms that means A led must be lit... if i need to tell the system a key has been pressed i must send a non-impulse(0) to the bus to override Its impulse to tell him that the user has pressed a key... but to do this I must control Tx to send data at and extreme precise time... If it put it into a buffer... I'll miss my delay and the system will be totally fuzzed and make beep all the time... even maybe call the police... So I must not... Now if you need further information just ask... BTW: Im working for the security compagny... This is not some kind of robber plan to disrupt security system... héhé "Fitzpatrick, Joe" wrote: > You can bypass the RS232 transceiver with a small Phillips screwdriver and a > soldering iron... > > FWIW, you might get more helpful answers if you would explain what it is you > are trying to accomplish. IE, what UART behavior you are trying to > circumvent and why... > > -jjf > -- For information on using the ACCESS Developer Forums, or to unsubscribe, please see http://www.access-company.com/developers/forums/
