AXT Systems

ASCM-4 Audio Switch Control Module
ASCM-4 Module top view
ASCM-4 Module bottom view
The ASCM-4 is a simple small MCU module for controlling the ISM-2 and OSM-2 audio switch modules with illuminated pushbuttons and includes a mute button option to disconnect all outputs to monitors.

It features controls for up to two ISM-2 input selector switch modules and up to six OSM-2 output selector modules, allowing a variety of configurations.

The MCU used is a Microchip PIC18F24K40 and the firmware source is provided below. A HEX file is also provided in the firmware zip to allow programming directly into the device without having to compile the code first.
The module can be powered from 5V directly or 12V if the onboard regulator is fitted.

It also has the option to accept another external voltage (Vex) to power the LED indicators in the pushbutton switches (which could be 5V or 12V). This is selectable as 5V or Vex onboard.

Some illumintaed pushbuttons come with internal resistors fitted so there is also the option to cater for these or to include resistors onboard in cases where they are not fitted.

The ASCM-4 module measures 86mm x 60mm.