Hola aqui algo de ayuda :Protocol description
FMS cable uses the serial interface, to transmit data from TX to computer. For proper work, COM-port must be configured in following way:
- 19200 baud
- 81N (8-bit data, 1 stop bit, no parity)
- RTS set to HI (+10v)
- DTR set to LO (-10v)
TX channel data been combined into packets and transmitted to computer. Data is combined into packets for each PPM cycle:
- Every packet starts with 0xFF
- For each channel, 1 byte been added to packet (after 0xFF).
Channel byte value vary from 0 to 0xFE. Table below describe dependency between pulse length and channel data.
pulse length converted to
760 uS 0x00
1528 us 0x80
2284 us 0xFE
each 1 in data is equal to 6 uS (+/- 6 uS in signal => +/- 1 in data).
EXAMPLE:
pause 0xFF 0x80 0x80 0x80 0x80 pause 0xFF 0x80 0x80 0x80 0x80 ...
That means, we have 4-channel transmitter, and all sticks are now in the midle position.
(!) Note, when transmitter is off, cable sends to computer 0xFF bytes constantly. That helps to determine, that cable itself is ok.