cisco 891F router access without console cable

We just got a Cisco 891F router and I am having trouble accessing it on the Ethernet so that I can configure it.  I had configured our previous Cisco 820 router and I was able to access it initially be setting my Ethernet adapter to and then I was able to access the router through to configure it.  This does not seem to work with the 891F.  I do not have a com port on any of our PCs to attach the console cable and I do not have a USB to Serial adapter.  I have tried resetting it to factory(press reset within 5 seconds of powering on) but that did not work.  Since this is brand new, I guess I can call cisco, but I wanted to see if anyone had an idea here.
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Jody LemoineNetwork ArchitectCommented:
Initial configuration on those routers needs to be done with a serial console as they have no IP address configured by default. If none of your systems have a serial port, a $10 USB serial adapter will work well. I've been keeping one in my toolbag for years.

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