How to calibrate KBD300A , PTZ drifts after release of KBD300A joystick

Issue

  • PTZ camera drifts to the right after release KBD300A joystick.
  • How do I manually calibrate the KBD300A

Product Line

Pelco Matrix

Environment

  • KBD300A keyboard Version (5.10 - 5.60)
  • PTZ camera

Cause

Buffer corruption

Resolution

To calibrate the keyboard,  Version 5.10 - 5.60 please follow the calibrations steps provided.

1. Cycle power to the KBD300A and hold down either the F1, F2 or F3 key until the version display for the keyboard has finished. Select the appropriate option: NOTE FOR EACH KEY YOU MUST UNPLUG THE KBD300A BEFORE MOVING ONTO THE NEXT KEY FOR CALIBRATION.

Example Unplug KBD300A hold down F1 continue to hold down F1 plug Cord back into KBD300A, when done with that unplug again and then press F2 down and plug back in continue until finished with full calibration.

  1. F1 key:  Holding down the F1 key will calibrate the PAN axis of the joystick.
  2. F2 key: Holding down the F2 key will calibrate the TILT axis of the joystick.
  3. F3 key: Holding down the F3 key will calibrate the ZOOM axis of the joystick.

 

2. The Seven-Segment LED’s on the keyboard display a numerical range of joystick A to D readings. This range goes from -99 to +99. On the KBD300A, the SHIFT LED represents a negative sign.  When either LED is on you are looking at negative readings. When either LED is off, you are looking at positive readings.

3. The way to do calibration is to move the joystick all the way in one direction (left or right) then gradually release it. At this point record the number shown (also whether it’s positive or negative). Next move the joystick all the way in the opposite direction then gradually release it. At this point record the number shown (also whether it’s positive or negative).

4. Determine where the axis center is by finding the reading that is in the middle of the two readings found in step 3. A simple example would be a high reading of 7 and a low reading of -7 (in this case you want the calibrated center to be at 0). Another example would be a high reading of 10 and a low reading of -3 (in this case you want the calibrated center to be at either 4 or 3 because 3.5 is the true center in this case). If the high and the low reading differ by more than 33, the keyboard should be returned (this means the joystick components are too worn out to go back to center properly).

5. Now that you have determined a calibrated center, position the joystick at the calibrated center and press the F4 key this is also the same key as the "ON-AUX". Pressing the F4 key will save the calibrated center for the next time the keyboard does a regular power-up.

Note: the same process as above is repeated for TILT, except the joystick is moved up, then down while recording numbers for correction.  To correct the ZOOM function, again follow steps 3 - 5 but this time twist the joystick knob clockwise or counter-clockwise initially then in the other direction for the next step.

Note Addition: Sometimes a customer will go through the joystick calibration procedure without being able to calibrate the pan/tilt axis’. If the joystick causes slow drifting in the pan/tilt directions after the joystick has been calibrated, it’s possible that the customer is not seeing the full range of joystick readings when he does the calibration. Another approach to joystick calibration is to move the joystick center reading further toward the direction where slow drifting is occurring. For example, if the joystick slowly drifts to the left, move the joystick calibrated center more to the left.

The above procedure is also useful for determining whether a customer has a bad joystick or fried components on their PC board. If the axis you are calibrating shows -99 or +99 on the Seven-Segment LED display and the joystick is in a rest position, you know you are looking at a defective keyboard which should be returned.