Thread: Discussion Another new 2.4GHz system!
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Old Jan 25, 2009, 03:06 PM
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The Netherlands, OV, Almelo
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Description of interface pinning and signals


hello,
here is some more interesting stuff for programmer and hobbyist.

Description of interface pinning and signals
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Chassis connector pinning as seen at the back of the transmitter
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Pin 1 : PMM signal
Pin 2 : +5 Volt
Pin 3 : RX RS232 Serial data input ( TTL levels(0..5Volt) , ATTENTION !!! NOT RS232 levels(+15,-15 .. +3,-3 Volt)
Pin 4 : TX RS232 Serial data output ( TTL levels(0..5Volt) , ATTENTION !!! NOT RS232 levels(+15,-15 .. +3,-3 Volt)
Shield : Ground


RS232 Serial Data specification
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115kilobaud , 8 bit , 1 stopbit , noparity , nohandshake

A string of 18 bytes is send every 20mSec by transmitter.
Data burst duration (86.4uSec * 18 Bytes) is approx 1.5552mSec
So we have 18.4mSec to do some great stuff with a microcontroller.

PMM signal specifations
-----------------------

A burst of 7 falling (H->L) edges is send every 20mSec.
Pulse time is time between 2 falling edges
Low part of pulse time is always 0.4mSec.



I inserted this picture because my 'beautiful' ascii pulses are mutilated by probably every available font.

sorry for the bad quality of the picture, i need a better picture server.


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Last edited by keepitsimple; Sep 25, 2013 at 05:15 PM.
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