No Comm from Micro to STP2

No sync responses have been received from the Stepper 2 Module for 10 seconds, and the unit performs a required shutdown.

Alarm 21100 No Comm from Any Board to Main Micro is not active and No sync responses have been received from the Stepper 2 Module for 10 seconds.

Engine and Electric Operation: Required Shutdown. If alarm remains active for 2 minutes issue a shutdown command to all modules except the display.

Sync response received from the Stepper 2 Module in the past 10 seconds, alarm reset or alarm may be manually reset by turning the unit off, then back on again.