ECS4510-52P Reset

Hi,

We bought a used ECS4510-52P and i can't connect to it via serial port: The port doesn't seem to work.  I tried many speed / data bits / stop bits, etc without success.

The switch transmits packets but doesn't get its IP via dhcp.  So, is there a "hardware way" of resetting it?  Like, a small reset switch somewhere?

Thanks