Re: PIC USART troubles

On 2007-03-03, hybrid_snyper <wayne_tams@xxxxxxxxxxx> wrote:
Hello all,

Im in a bit of a desperate situation. I am trying to get my PIC 16f876
to talk to a Ericsson T28. The T28 has both TX/RX pins and I have
connected them directly to the TX/RX pins on my PIC. I measured the
voltage across the VDD and GND on the phone and I am running my PIC at
the same voltage. I have written a simple program that should send the
AT command AT+CFUN=0 this should turn the phone off. However this is
not the case, I am not sure if i am understanding the USART spec,
people have mentioned something about inversion but i thought this
would only apply when wishing to reach RS232 levels.

are you connecting PIC TX to phone RX (and vice versa) ?
and also connecting signal ground at both ends?



--

Bye.
Jasen
.