Zmodem Use Existing Open Com Port

Hello. We are connected to a device that uses ZModem for file transfer. We connect to the device using a Modem. Once connected we issue a DIR to the deive to get a list of files. From the file list we have to download all the *.ZIP files. To download a file we send a the command "Send path\filename" to the device. Then the Zmodem transfer starts. How can we use the com port open from our application with the Zmodem component? Thanks for all your help.