Hi,
I built a Hardware connection for MC9S08MP16, which is the same as described in app note AN1857, page 13. I try to communicate using Freemaster, with correct Baud rate setting. Unfortunately, it doesn't work. When I use P&E micro debugger, the communication is fine.
I measured my PC and found both pin 4 and pin 7 is of voltage around -11V. Anyone has an idea about this configuration?
Thanks
Ed
forgot to mention that I use the "real" serial com port, NOT USB port.
Hi Mike,
that is the point. I don't know anything about the serial source code and I didn't find any information from the Freemaster webpage. Previously, I use P&E micro debugger, it works fine with Freemaster, which means my project code is okay. Now I need to communicate only using com port, that is the problem I have now.
Thanks
Ed
Hello Ed
For the optoisolated interface to work correctly when sending data to the PC, the signal at pin 7 (RTS) need to be set active by the PC, to achieve a voltage level of about +12 volts. At the same time, the signal at pin 4 (DTR) should remain inactive, to retain the negative voltage level.
Regards,
Mac
Hi Mac,
Thanks for the explanation. Should I do anything about this voltage setting? or it is done automatically by Freemaster?
Ed
Hi Mike,
Thanks for your reply. I didn't find the files on the webpage "FreeMASTER Run-Time Debugging Tool". Could you please send me the link to the files or a screenshot of the webpage?
Thanks
Ed