Logomatic over 9600 baud

Has anyone gotten a Logomatic v2 to log/function over 9600 baud?

As soon as I go over 9600, I get garbage text.

Is it possible that my RS-232/TTL circuit can’t keep up with the faster baud rate? Or is it the logomatic?

My Logomatic V1 logs the EB85 at 57600 with no problems. But there is no RS232/TTL converter, and the GPS module is attached to Logomatic, thus 5cm cable.

Angelo