What does a Unity Quantum "Dead error 405 81" indicate?
Issue:
What does a Unity Quantum "Dead error 405 81" indicate?
Product Line:
Unity Quantum
Resolution:
Dead error 405 is defined as "time out waiting for Modbus Plus"
Sub code 81 means "Prom Checksum error"
During operation the MB+ processor (on the CPU) periodically performs self tests. This error means that the computed checksum was bad.
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