Help with command via Serial Port

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i need .... need send number (example '1') via serial, turn on port, , when sending same number again same port turned off , inversion between on , off done whenever same number sent ... me code?

'1' not number. well, ok, is, ist value isn't one, it's 49.  1 number. '1' character , ascii value of '1' 49.

we can code. post , we'd happy take look.


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