Why can not find the IPM-1200x by IPM1200x Upgrade tool?

With DHCP Server
1)Install the IPM-1200x after DHCP server.
2)Set the IP of PC to “Obtain an IP address automatically”.
3)Power ON the IPM-1200x.
4)Open IPM1200x Upgrade tool to search the IPM-1200x.
　Not with DHCP Server
1)Power ON the IPM-1200x
2)Open the HyperTeminal to disable the BOOTP/DHCP Control via console port.

3)Set the static IP HyperTeminal.

4)Select the “Use the following IP address” and Set the static IP to PC.
5)Open IPM1200x Upgrade tool to search the IPM-1200x.