Special Function Dip Switches

In its wide DIP-Switch product range Hartmann Codier offers a very special function switch: Tri-state. On switches of D14AT and D14AS series the pins of the back row can be switched from home position (0) to the left (+) or right (-) front row pin. That gives you three positions per pole. But what is the benefit of three positions per pole?

When it comes to devices with limited space and higher numbers of codes are needed, tri-state switches will offer 3n different codes in the same space where a standard DIP-Switch will only have 2n codes. Or to put it the other way round: to create the same number of codes with a standard DIP-Switch you will need a lot more poles and space compared to the tri-state switch.

To create e.g. 200 codes with a standard DIP-Switch you will need an 8-pole version (28 makes 256 codes) which has 20.28mm width or a 5-pole tri-state (35 makes 243 codes) which only needs 14.3mm. For space sensitive devices like handheld transmitters which need even more codes for security reasons, the difference of space needed is even more obvious:

Standard DIP-Switch:Tri-state Switch:
14 pole version 9 pole version
214 = 16384 codes39 = 19683 codes
35.48mm width24.46mm width
  • three positions per pole
  • more codes available per pole
  • less space needed for similar number of codes
  • space sensitive applications
  • large number of codes needed
  • handheld transmitters
  • radio remote controls