serout2 using Open Inverted

[Pimentel]

Hi,

Explaining better… I have 2 PICs sending data for a radio configured for 9600, N, 8,1. When I insert a 4k7 resistor to VCC the circuit fail.
Now, as attached figure always functions!

[Bruce]

For inverted serial the TX pin should idle low, so a pull-down resistor would be
required. If you were using true mode then a pull-up resistor would be needed.

[Pimentel]

Hi Bruce,

Now I understood. I go to insert a pull down resistor then!

Thanks again

Pimentel