User`s manual

278 digi.com Graphical User Interface
Serial Options
This is where you setup for serial communication. The following options are available when
the
Use Serial Connection radio button is selected.
Debug Baud Rate
This defaults to 115200 bps. It is the baud rate used for target communications after
the program has been downloaded.
Max Download Baud Rate
When baud negotiation is enabled, Dynamic C will start out at the selected baud rate
and work downwards until it reaches one both it and the target can handle.
Disable Baud Negotiation
Dynamic C negotiates a baud rate for program download. (This helps with USB or
anyone who happens to have a high-speed serial port.) This default behavior may be
disabled by checking the Disable Baud Negotiation checkbox. When baud negotiation
is disabled, the program will download at 115k baud or 56k baud only. When enabled,
it will download at speeds up to 460k baud, as specified by Max Download Baud
Rate.
Serial Port
This drop-down menu lists PC COM ports that may be connected to the Rabbit-based
target. The default is COM1. Starting with version 9.60, Dynamic C identifies which
ones are USB ports.
Stop Bits
The number of stop bits used by the serial drivers. Defaults to 2.
Enable Processor Verification
Processor detection is enabled by default. The connection is normally checked with a
test using the Data Set Ready (DSR) line of the PC serial connection. If the DSR line
is not used as expected, a false error message will be generated in response to the con-
nection check.
To bypass the connection check, uncheck the “Enable Processor Verification” check-
box. This allows custom designed systems to not connect the STATUS pin to the pro-
gramming port. Also, disabling the connection check allows non-standard PC ports or
USB converters that might not implement the DSR line to work.
Use USB to Serial Converter
Check this checkbox if a USB to serial converter cable is being used. Dynamic C will
then attempt to compensate for abnormalities in USB converter drivers. This mode
makes the communications more USB/RS232 converter friendly by allowing higher
download baud rates and introducing short delays at key points in the loading process.
Checking this box may also help non-standard PC ports to work properly with
Dynamic C.