----- Original Message -----
From: "Greg Hartung" <ghartung@USWEST.NET>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Saturday, May 20, 2000 2:44 PM
Subject: usart to usart


>    I am trying to get a 16f877 to talk to another one over the built-in
> serial usart.  I don't think I need a Maxim or Dallas rs-232 chip.  Can
> I simply hook tx to rx?  Receiving 877 never gets anything.  I tried a
> series resistor and a pullup.  No luck.

I'm using a PIC 16F873A to talk with a PIC 16F874A by doing essentially what
you described and it works. Although it's not a direct connection (I have an
FSK modulator/demodulator so I can multiplex several signals on a single
coax), it should do the same thing. I'm using the CCS C compiler to develop
my code.

Dan