DIP switch

2) a rotary version of a multipole slide switch where one signal has a choice between multiple connections, such as SPDT, SP3T, SP4T.

In this case, the circuit board also needs interface circuitry for the DIP switch, consisting of a series of pull-up or pull-down resistors, a buffer, decode logic, and other components.

[6] DIP switches were used extensively in ISA architecture of PC expansion cards to select IRQs and memory addresses.

DIP switches were very commonly used to set security codes on garage door openers as well as on some early cordless phones.

This design, which used up to 12 switches in a group, was used to avoid RF interference from other nearby door opener remotes or other devices.

Reasons include the trend toward smaller products, the demand for easier configuration through software menus or plug and play, and the falling price of non-volatile memory.

However, DIP switches are still widely used in industrial equipment because they are inexpensive and easy to incorporate into circuit designs, and because they allow settings to be checked at a glance without powering the system on.

The DIP switches set a different radio frequency or address for each transmitter/receiver pair, so that multiple units can be installed without unintentionally controlling each other.