Our Mentor II drives communicated with an HMI using a serial cable, we know this is becoming obsolete, do you have a recommendation for upgrading and what protocols do you have available?

The Mentor II provides a RS422 connection, which is a legacy serial protocol for Control Techniques.

The Mentor MP drives have a built in RS485 port but additional option modules can be added. The MP has a total of three slots for option modules. The most popular communication protocols that can be used with the Mentor MP by attaching an SM option module are EtherNet/IP,  EtherCat, Modbus TCP/IP and DeviceNet.