Hi Rudy,
I have tried serial IR to a PIC16F628. It worked well after I slowed down
the TX/RX speed. I doubt you are having this problem with RF, but you could

try and slow down your TX/RX speed, like 2400.
The I/O pin on the PIC12C509A should have no problem driving the F628 pin.
Also, you could try outputting the TX to the RX on your PC serial port.

Good Luck,
Kevin

>Hi everyone,
>
>I am working with serial communication of the 16F628, and I am getting some

>strange results.  What I am trying to do is to get serial communication
>through RF from my laptop to a 16F628 (for remote control application later

>on).  I first set up using COM1 output of my laptop to a serial line
>receiver (LM1489) that converts RS-232 voltage level to TTL level, and then

>connect the TTL level output to the Serial RX line of F628.  Everything
>works!  Commands are transferred through correctly (I made it to turn on and

>off an LED).
>
>So, after that I tried it through RF.  I have built my own RF "interfacer"

>that will reliably transfer digital data across the Wenshing/Velleman RF
>modules.  I have tested the "interfacer" many times and it works very
>reliably.  The RF "interfacer" is a 12C509A.  The output of the 12C509A is

>fed into the Serial RX pin of 16F628.  Now, sometimes it works (the command

>is tranferred), most of the time, it doesn't.  I am very sure about the
>correctness of the transmitted RF signals i.e. when I look at the signal in

>a fancy digital scope, the correct serial data is received.  My intuition is

>that the current output of the 12C509A (using pin 3/GP4) is not enough to
>drive the Serial RX of the 16F628.  Has anyone faced this problem before?
>
>Help please!  Thank you very much in advance.
>
>
>Rudy
>
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