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The short story here without using any EMS is to use:

• A window:, such as FenestrationSurface:Detailed in which you define the bare construction
• WindowMaterial:Blind
• WindowProperty:ShadingControl with Type of Slat Angle Control for Blinds set to BlockBeamSolar

If BlockBeamSolar, the slat angle is set each timestep to just block beam solar radiation. If there is no beam solar on the window the slat angle is set to the value input for the WindowMaterial:Blind that is contained in the construction specified by Name of Construction with Shading or is specified by Material Name of Shading Device. The BlockBeamSolar option prevents beam solar from entering the window and causing possible unwanted glare if the beam falls on work surfaces while at the same time allowing near-optimal indirect radiation for daylighting

This is going to allow you to vary:

• The slat angle
• Whether the blind is deployed or not. That's binary, not varying. Either fully deployed, either fully retracted.