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The calibration process is absolutely necessary for proper rotator control and consist of two parts: setting rotation
limits and calibrating the position indicator. Both calibrations can be done separately.
Prior first use of each uLINK ROTATOR module, A/D converter min/max ranges (CW/CCW limits) must be set if
module is going to be used with analog sensor.
NOTE: For pulse sensors it is not necessary to adjust and the rotator can be directly calibrated.
1. Properly connect the rotator to the uLINK ROTATOR module, refer to the previous chapter for details.
2. Open top cover of the module. There are two miniature multi-turn trimmers labeled OFFSET and SCALE
located on the board. Use a 1mm flat screwdriver for adjusting.
WARNING: Always open the top cover first when assembling or disassembling modules. Failure to do
so may result in damage to the trimmers.
3. When module display is set to AZ position press and hold SET button. AZ led will start flashing and
ADDRESS led will illuminate indicating that the module has entered analog sensor calibration mode and
is ready for CCW limit calibration.
4. Turn rotator with 3 and n button fully CCW. If your rotator does not have hardware limits, turn the
rotator to the desired maximum counter-clockwise position.
If the rotator moves in the opposite direction exchange all three leads connecting CCW relay with all
three leads of CW relay, because rotator is wired backward. When CCW limit is reached continue on
next step.
5. Set the OFFSET trimmer until display shows value 002 or slightly higher number. Number represents
A/D converter RAW data. When set, turn rotator slightly CW with 4 and n button and verify that the
value is increasing. If yes, return the rotator to the desired CCW limit and continue on next step.
If the value is decreasing, sensor is wired backward and must be reversed. The voltage on S relative to
GND terminal must increase in with CW rotation. When fixed return to step 2.
6. Press and hold n and SET for two (2) seconds to register CCW limit. The ADDRESS LED will turn off
and the USER led will illuminate indicating that the module is ready for CW limit calibration.
NOTE: If you want to switch to the next step without setting CCW limit value, press n and SET simultaneously
for less than one second.
7. Turn the rotator with 4 and n button to the CW limit. If your rotator does not have hardware limits, turn
it to the desired maximum clockwise position.
8. Set SCALE trimmer until display shows slightly less than 0.21 (the decimal point indicates that the
leading number is not shown). The raw value is 1021 or almost full scale for the 10-bit A/D converter.
9. Press and hold n together with SET button for two (2) seconds to register CW limit and store both limits
to module EEPROM memory. USER led goes off and AZ led stops flashing. It means that the limit
calibration is finished.
If trimmers were too far off, you may repeat steps 2 to 8 for increased accuracy.
IMPORTANT: Pressing the SET button alone anytime during calibration will abort the calibration process
without saving the limit values. The previous values remain valid.
Once CW and CCW limits are set for each uLINK ROTATOR module, rotators can be calibrated.
microHAM © 2016 All rights reserved
uLINK ROTATOR Calibration
Rotators with analog (potentiometer) sensor
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