Cannot access ports on second RapidPort/4


I have had a RapidPort/4 connected to my windows XP machine for several weeks now and all has been working great, today I pluggd a second rapidport/4 into the first one using the usb port, XP saw the device and installed all the drivers and modem devices, however I am unable to get any of the modems on the second rapidport to answer, all the modems on the first rapidport respond correctly when send the AT cmd using hyperterminal.

Is there anything special I need to do to get the second set of 4 modems to respond ?

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