The ALMAX TFT touchscreen makes it possible to upgrade product functionality without re-designing the interface. The touchscreen provides increased capability while preserving the simple switch functionality of the original membrane keypad. It does this with an interface module that manages an RS-485 serial interface and graphically replicates the original keypad.
The ALMAX TFT touchscreen can be used as a drop-in replacement for an existing keypad or can be tailored to better suit product applications. The touchscreen can accommodate either multiplexed or non-multiplexed keypad configurations and it can display a range of graphic elements including graphic LEDs, button highlights and product branding.
The ALMAX TFT touchscreen delivers higher RS-485 networking capability than a traditional membrane keypad. The RS-485 bus is accessed directly, minimizing the interconnect requirements at the application board. This enables much longer cable runs and allows multiple displays to be accessed on a single RS-485 bus.