Philippe TECHER wrote: > I'm not interesting in PWM but in PCM standard. R/C receiver get - in analog > > This is analog coding. Today, the R/C transmitter use another system to send > servo position. To avoid some trouble, it use PCM coding, that means there > is some numerical codes are sent to the receiver. This sequence is a standard. > > Does any one know this standard ? Means code, pulse width and so on ... I don't believe there is a standard - all the manufacturers have their own encoding schemes. The servos are still driven with PWM signals, and are more or less compatible, but the PCM receivers are not interchangable, unlike the PWM receivers, which like the servos, are more or less compatible between manufacturers. Clyde -- Clyde Smith-Stubbs | HI-TECH Software, | Voice: +61 7 3300 5011 clyde@hitech.com.au | P.O. Box 103, Alderley, | Fax: +61 7 3300 5246 http://www.hitech.com.au | QLD, 4051, AUSTRALIA. | BBS: +61 7 3300 5235 ---------------------------------------------------------------------------- For info on the World's best C cross compilers for embedded systems, point your WWW browser at http:/www.hitech.com.au, or email info@hitech.com.au.