Page 10 RS500/600 Series Doors Part No 4801-5158 Rev 1-2017
4 How the SC-325 & SC-650 Controllers Communicate with the
RollSeal RS-500/600 Door.
Inside the upper right housing of the RollSeal RS-500/600 Door is an Encoder that sends electrical pulses to the
SC-325 & SC-650 Controllers. When the door is moving, the Controller is in normal operating mode. (See Section
20 or Manual #4801-5156 for wiring diagram of the Encoder). The SC-325 & SC-650 Controllers refer to the
position of the door in units of “Counts”, which is based upon the number of encoded pulses that the Encoder sends
to the Controller.
NOTE: The term Position Units is used throughout this document and refers to the position of the
door in units of Counts.
A Count of zero is assigned to the full open position where the Home Switch operates, and the highest count is
assigned to the full closed position. The maximum number of Counts that the SC-325 & SC-650 will read depend
upon the particular installation. In general, a Count is approximately equal to 1/8 inch of door movement. Several
of the parameters of the SC-325 & SC-650 are displayed in units of Counts, such as the Actual Position, the Open
and Closed Limit Positions and the Acceleration and Deceleration Ranges.
RS-500/600 Door and Controller
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