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The cable is very simple, it contains only 2 conductors:
Center pin RD receive data, pin 2 on 9 pin connector and pin 3 on 25 pin connector.
Ground shield Signal ground, pin 5 on 9 pin connector and pin 7 on 25 pin connector.
It is not possible to send any data from the pc to the light meter, but the light meter transmits data constantly.
See Anemometer AM-4204 if necessary, as this device contains similar electronics.
Baud rate 9600, no parity, 1 stop, 8 data bits.
No version command.