Trouble with IDE debugger and gdb

Hello everybody, I have a problem with the IDE debugger.

-I have QNX Momentics IDE ver. 6.2.1A
-I have to download and test my application sw from host (pc with windows 2000) to a target (with basic sw using libraries of QNX ver. 6.2.1A).
-The target and the host are connected with a serial line.
-pc uses an rs232, target uses an rs485, a converter rs232-rs485 is
used.

When I transfer my application with kermit(speed 115200)every time goes ok.

When I transfer my application with IDE debugger (speed 57600, upload executable from host, com1) on the target (pdebug -v /dev/ser1,57600) some times goes OK, most of time goes KO

What can I done?

If I debug my application with IDE debugger using executable on target I think is not safe, is true?