Can I define custom ports for COM1 port of the RTS?

Hello,
For use in the project, one of 12 “Cobra FEZ” I bought.
GSM modem connected to COM2.
COM1 RS485 necessary linking.
But I need the output of the RTS for the MAX485. Can I define custom ports for COM1 port of the RTS? For example, IO75

Thanks

One of the COM ports (I think COM2) has handshaking pins RTS/CTS

COM2 RTS-controlled sample code here?
Example of sending and receiving?

It is automatically controlled. You only need to select hardware handshaking.

COM2 - SN75176 - RS485
DIR pin how to connect a tip?
DIR pin = SN75176 (RE & DE pins)

Thanks

Goto code.tinyclr.com and search for rs485