Hello,
Under Dynamic C 9.62 at the below path
C:\DCRABBIT_9.62\Samples\BL2600\RS232
there is a sample application SIMPLE5WIRE.C regarding the flow control,
TxF and RxF become the flow control RTS and CTS.
For more information on this , please go through the BL2600 user's manual at the below link
http://ftp1.digi.com/support/documentation/019-0142_M.pdf
Thanks.