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USB modems often allow limited options in terms of settings and this can lead to communication problems.
We have had success establishing communication using these modems by adjusting some settings in the clock and in the software. The Smart Clock will need to be set to SPACING for parity (there are detailed instructions in this FAQ for changing the clock's settings). The baud rate should be at 9600.
The software settings need to be adjusted to NONE for parity, data bits 8, stop bits 1 and the baud rate 9600.
Once those settings are in place, you can test the modem communication to the Smart Clock once again.