Pieter, Check the DC levels of the signal at the MCU end with your 'scope. If it is not getting up to 3 or more volts and/or does not drop to near zero volts, it may not be properly sensed by the MCU.
You could also have a problem with marginal voltage swings on the RS-232 signal from the computer which could cause some bitsd in the data stream to be improperly detected. Another possible cause could be a weak MC1406 chip in the KIO2. 73, Don W3FPR > -----Original Message----- > > Thanks, Jim. > This is most bizarre! > I have a scope and have checked that the rs232 signal goes right > back to pin > 26 on the MCU. > I have also replaced the MCU (version 2.04P) with the previous > version (2.03D) > without result. > Pieter > -- No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.0.322 / Virus Database: 266.11.16 - Release Date: 5/24/2005 _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
