Quote Originally Posted by cooksydesign View Post
You are correct, I clicked on the wrong link when I was looking at dataseets yesterday. As I mentioned earlier, the circuit was working for quite awhile so I made a few boards. Now I see there are some problems with a few other PC's. Back to my original question, if 16780 works for 2400 baud in a SER2 command, what is the True seeting? I tried 396, then I get something other than what I expect. Looks like a baud rate setting. I can remove the MAX8130 and the circuit works fine, when the SER2 commands are returned to the proper settings. Thanks for pointing out the USART pins. Unfortunately, I have made boards and those pins are used.

b
In the back of the Book, Appendix A
Code:
B/R    OUTPUT  CONVERSION  PARITY      MODE 
2400   DRIVEN  TRUE           NONE      396
2400   DRIVEN  TRUE           EVEN     8588
2400   DRIVEN  INVERTED       NONE    16780
2400   DRIVEN  INVERTED       EVEN    24972
2400   OPEN    TRUE           NONE    33164
2400   OPEN    TRUE           EVEN    41356
2400   OPEN    INVERTED       NONE    49548
2400   OPEN    INVERTED       EVEN    57740