I looked at the resistors that I used successfully. My previous post was in error with regard to the resistor value used in the TX line from the PIC. I used a 10k, not a 1k. I don't know if a 1k will work in the TX line, but I know the 10k works.

I still use the 1k in the RX line to the PIC, though.

I am next going to install an RS232 converter to avoid all this resistor roulette!

Best regards to all,
Bob