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| The controls
are recessed under the surface edge of the turntable to help prevent damage
due to objects which might be dropped from above, since the turntable is
often located on a floor surface. Most of the functions are self explanatory.
The LT360 supports both Unipolar (0 to 360 degree) and Bipolar (0 to ±180
degree) formats. • USB Interface This is a standard type-B connector providing connection to a USB bus. The USB interface of the LT360 uses only Low-Speed connection speed. This is more than adequate for control of the turntable. • RS-232 Interface The DB-9F connector is wired as a DCE device, so only a straight-through cable connection is required to the DTE host (computer). The LT360 does not require any handshaking, so only the RX and TX signals are used in addition to Ground. • Pulse Input This BNC connector provides a means to step the turntable via a TTL pulse. Each pulse will cause the turntable to rotate by the current step size, and in the direction of either CCW or CW. Triggering based on the Rising or Falling edge can be selected. • Analog Input This BNC connector provides a means to control the location of the platter by analog voltage. The scale factor is 10mV/deg, and the resolution of the LT360 is 0.1 degree. • Analog Output This BNC connector provides a means to obtain an analog control voltage from the LT360. This can be useful if driving some other display, chart recorder, or other plotting device. The scale factor is 10mV/deg, and the resolution of the LT360 is 0.1 degree. • LED Display The four digit LED display is used primarily to give the current position of the platter. The readout can be either Unipolar or Bipolar as selected through the Win32 software or commands. However the display has many other purposes. When various switches are pressed the display will show Position (Degree), Step Size (DegPerStep), Velocity (RPM), Torque (%), or the Accel Function (#). • Step CW / CCW (White switches) These two switches are mainly used to step the platter by the current step size, either clockwise (CW) or counter clockwise (CCW). When the switch is pressed, the platter will rotate by the current step size. These switches are also used with other switches to increment/decrement parameter values. • Zero CW / CCW (Green switches) These two switches are used to move the platter to the origin (0.0) either by clockwise (CW) or counter clockwise (CCW) rotation. • Set Origin (Blue switch) This switch is used to reset the origin to the current platter position. No platter movement occurs. • Set Step Size DPS (Blue switch) This switch is used to change the step size. When this switch is pressed, the display will show the current step size. The step size can then be changed up/dn by pressing the White buttons. The minimum step size is 0.1 degree. • Set Velocity RPM (Red switch) This switch is used to change the velocity in revolutions per minute. When this switch is pressed, the display will show the current RPM setting. The RPM can be changed up/dn by pressing the White buttons. The minimum RPM is 0.01 and the maximum is 3.00. • Set Torque % (Red switch) This switch is used to change the motor torque in percent. When this switch is pressed, the display will show the current torque setting in percent. The torque can then be changed up/dn by pressing the White buttons. The max value is 100% and the min is 10% |
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