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I want to sent binary to comms port?
Please explain can it be done
8 data bits
why 8?
It is not necessary, but it's quite likely to be the most convenient:
In most cases, "binary" data will be 8-bit bytes - so setting the serial port to 8 data bits makes sense.
The other important thing is to ensure that the port (including any drivers) will not try to interpret any specific values as any kind of "control" code - eg, software flow control...