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Green LED.... Technical
A place to share information, drawings, schematics, ideas, concepts, hints, techniques about Visor PDA devices.

 Back to Technical Main Menu  Visor Cable Reference  Design Considerations
 Tail LED Light for Visor Device  Visor Cable Work Sheet  Schematics - Coming soon
 SV203 Interface & Visor PDA  Cheap Cable Tester  Visor Robot Kit - PPRK
 Modifications to SV203 for Visor  Visor Port Data  Project Photo Gallery
 SV203 to Visor Cable    PDF Download Files
 Programming    Legal Notice About Drawings
 Mini SSC II Interface & Visor PDA   Questions & Answers  


Visor to SV203 Controller


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Visor Cable Reference.
Cheap Cable Tester

Note: Cable manufactures may use different wire color codes for the cable you have.
You may need to determine your cable wire coding to correctly configure the cable to work.
Use a Multimeter to determine the color of the wire and the corresponding pins to be used.

Visor Cable

Cheap Cable Tester

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SV203 Controller Modifications for Handspring Visor


SV203 Modification Instructions

This modification allows the Visor PDA to work with the SV203Controller.

WARNING : This procedure voids your Pontech warranty. You assume responsibility for all
damages to your Pontech SV203 controller as a result of any modifications you do to the board.

NOTE: Once you modify the Pontech controller to work with the Visor, will NOT work with Palm PDA devices anymore.

SV203 Modification Steps:

1. Take a look at the Pontech controller board. ( drawings below ) The side with all the components and
.... header connections on it is the top side. Flip the controller board over, there is only one IC chip there
.... and it's a small surface-mounted MAX489 IC chip. This is the bottom side of the SV203 controller
.... board which you will be modifying.

2. Use a small pen soldering iron and solder wick, carefully remove the solder from the MAX489IC pins.
.... Take an X-ACTO knife and gently pry the MAX489 IC pins away from the PCB board while heating
.... each pin with the small pen soldering iron. Use caution not to overheat, or damage the PC board and
.... traces. Remove the MAX489 IC from the Pontech controller board.

3. Check the PC board for any damage that may have occurred and for any splash over solder that could
.... short out any surrounding traces.

4. Look for a small White Dot on the PC board near the point where the MAX489 was. (see drawings below)
.... This is the reference point for the MAX489 IC, indicating that this is pin 1 of the MAX489 IC chip.

5. Using small gauge wires, make a jumper connections between,
....Pin 2 to Pin 11 and then Pin 5 to Pin 10.Use caution when soldering the wires to the PC board pads.

6. Check the PC board for any splash over solder that could short out any surrounding traces.

7. The SV203 controller board is now ready to be used with the Visor PDA.

SV203 Modifications for Visor

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Visor to SV203 Cable

Visor to SV203 Cable

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Visor Tail LED Light

Visor LED Light

To use the Visor Tail Light, attach the LED module to the Visor serial port.
Turn ON the Visor serial port (Use dot-command to activate the serial port)

Note: (Tail Light programs for the Palm PDA can also be used to activate the Visor Tail Light)

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Example Codes / Programs for the Visor PDA Device

 Visor Icon

.. Examples / Programs for the Visor PDA Device

 Palm Tail Light Programs    
 yBasic Programming    

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In no event shall Robert Van Deest be liable for any claim for incidental, consequential damages, or any injuries sustained due to the use of or improper use of these circuits or drawings represented. Circuit and design presented here should NOT be used for medical, life-saving, life-support, or any applications that could cause injury, dangerous and hazardous situations or consequential damages resulting from the use of these circuits represented.

All circuits, diagrams presented are represented as is, and have no guarantee as to the correctness of the items presented. Use at your own risk.

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Copyright © 2007 Robert Van Deest, All Rights Reserved
























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