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EPICS Motor Variants

BEC exposes three closely related EPICS motor classes through ophyd_devices:

  • ophyd_devices.EpicsMotor
  • ophyd_devices.EpicsMotorEC
  • ophyd_devices.EpicsUserMotorVME

Which one should I use?

The right choice depends on your EPICS motor implementation.

  • If you have an ECMC-based motor, choose ophyd_devices.EpicsMotorEC to get ECMC-specific signals and checks.
  • If you have a VME user motor, choose ophyd_devices.EpicsUserMotorVME to get VME-specific signals and behavior.
  • For everything else, start with ophyd_devices.EpicsMotor as the normal default.

What to remember

  • BEC provides several EPICS motor classes because different motor backends expose different behavior and signals.
  • ophyd_devices.EpicsMotor is the normal default choice.
  • Use ophyd_devices.EpicsMotorEC for ECMC-based motors and ophyd_devices.EpicsUserMotorVME for VME user motors.
  • Choosing the closest matching motor class gives you the right backend-specific interface in BEC.