If you have purchased the SimulConn Extension, you have it in one of these configurations:

SC-SIMVIMX-EXTENSION-R1 (Raw PCB, no components. Add and solder connectors yourself)
SC-SIMVIMX-EXTENSION-R1-COMPLETE (Fully mounted and tested board)


This version is a raw PCB, mount the connectors of your choice.

What you need is:

  • M : Connection to Master board.
    It is recommended to use IDC connector, as this is the same type used on the Master board.
  • I01-I07 : Connection to IO-boards.
    It is recommended to use IDC connector, as this is the same type used on the IO-boards.
  • X1 : 12v input power connecter.
    This input is optional. In the default configuration, the DC power (normally 12v) is transmitted from the Master board over the ribbon cable (J2 jumper set to “M”). 
    To use local X1 power input, move the J2 jumper to “12v”. 
  • R1-R16 : Pull-up/pull-down resistors (optional).
    If you experience signal issues with very long cables or noise, you can insert resistors here to provide cleaner signals to/from the Master board. Do only use this option if you have issues!
  • J2: Power selector jumper
    There are two ways to power the IO boards connected to the Extension board:
    1) Power from central Master PSU: Set jumper between middle and “M”
    2) Power from local Extension PSU: Set jumper between middle and 12v


The below components are recommended for the Extension board, but not mandatory. Cables can be soldered directly to the PCB.

MIDC cable socket 20pRecommended
IO1-IO7IDC cable socket 14pRecommended
X12 Pin Screw Terminal Block Connector 5.08mmRecommended
12VPin header 2.54mmRecommended
J9-J11Jumper for pin headerRecommended


Connector pins

The IO connecters (IO1 to IO7) found on the extension board has the following pin connections:

  1.  VIN (Power from either master board or extension board, depending on your setting for the power selector J2)
  2. VIN (Same as pin 1)
  3. S0 (Arduino pin 22 – Address bus)
  4. S1 (Arduino pin 23 – Address bus)
  5. S2 (Arduino pin 24 – Address bus)
  6. S3 (Arduino pin 25 – Address bus) 
  7. S (Arduino pin 26 – Output control) 
  8. L (Arduino pin 27 – Output control)
  9. D (Arduino pin 28 – Output control)
  10. T (Arduino pin 29 – Output control)
  11. P (Digital/Analog pin on Arduino – Selector)
  12. n/a
  13. GND
  14. GND