AVR-Chat

Hi there,

 

What is the input to the RF transmitter? Does the RF transmitter have
onboard encoding to handle the air interface? IE, does to take your data and
convert it to some form of RETURN TO ZERO format such as Manchester encoding
or PWM?

 

Do you have a datasheet link to the RF module you are using? It would be
useful to know what the module is expecting and help us figure out what you
need.

 

There is a nice little intro to serial communications here that explains the
use of the parity bit. It is a very simple way to check bytes for simple
errors but not reliable enough to guarantee good communications. Better to
use some form of CRC or other error correcting as part of your telegram.

 

http://www.taltech.com/TALtech_web/resources/intro-sc.html

 

 

 

From: AVR-Chat@yahoogroups.com [mailto:AVR-Chat@yahoogroups.com] On Behalf
Of iijfet
Sent: 18 August 2009 13:25
To: AVR-Chat@yahoogroups.com
Subject: [AVR-Chat] 4800bps to 9600

 

  

hi friends,
i want to convert baud rate of input data from a medical module.
my data is 60 packet per second & every packet includes 5 bytes.
this is also 8 data,1 stop & odd parity. 
therefore,my data is 4800bps & i must convert it to 9600bps because of my RF
module.
my RF module can transmit a data that is 9600bps with odd parity,but it cant
transmit 4800bps with odd parity correctly & when it transmits this data
some byte cant be transmitted such as 45 or 7F(hexa).
also i wanna to know how odd parity work & what is its detail. 



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