Quote Originally Posted by mbw123 View Post
Wow, thanks Skimask, it appears to be working. I put the 22K resistor in and it is recognizing the voltage from the serial port.

The one thing I didn't understand is

"it'll be inverted from normal RS-232 standards since it's not going thru a MAX-232."

What will be inverted?

-MW
Well, the RX and TX lines are inverted from RS-232 standards right because you're not using a MAX232?
Which serial modes are you using? Probably an N2400 or some other inverted mode...
Aren't the RTS and CTS signals upside-down from what you'd expect (if they were true RS-232 standard signals)?