----- Original Message -----
Sent: Sunday, June 30, 2002 12:05
PM
Subject: Re: Controlling the Nokia phone
using Microcontroller
I assume that you have an interface between
the Nokia 5110 and your computer
com port. This will contain a Max 232
level shifter chip plus a few zenners
and diodes and a 7805
regulater. I built the fbus interface from a drawing
off the Net, but
you could buy one. The interface has an RB9female at one
end and a Nokia
5110 plug on the other end. The idea is for your project to
offer the same
electrical conditions to the interface as your computer com
port does. On
the enclosure (the box) for your project fit a DB9male socket
(just like
the computer port). From your project circuit board take a line
from the
GND to pin 5 of the DB9male. Now identify unregulated 12 volts
DC
(roughly) on your project and run a line to pin 4 of the DB9male.
Identify
your project's Rx line (on the 68HC11 this is port D bit 0) and
run it to
pin 3 of the DB9male. Identify your project's Tx line (on the
68HC11 this is
portD bit 1) and run it to pin 2 of the DB9male. Leave all
the other DB9male
lines unconnected. (You could run DB9male pin 6 to -12
volts on your project
if you have -12 volts, but it is not
essential)
Best wishes
Mike Robson
----- Original Message -----
Sent: Friday, June 28, 2002 7:18
AM
Subject: Controlling the Nokia phone
using Microcontroller
Hi,Mike and Phil and all the kind
friends,
I am working on the MCU
<-> Nokia handphone too. I plan to using MC51 and Nokia
8210/6210. The cable is just FBUS TX,FBUS RX,FBUS GND. THe C51's working
voltage is 3.0V. Can the cable working? how about your
connection?
Regards.
JaneXie
AVR_Nokia6110_connection.gif