The serial programming cable is an accessory for the Terxon MX. With the programming cable, you can conveniently connect your PC to the Terxon MX in order to configure the alarm system's settings. Use the serial port (COM port) of your PC or laptop for connection. If there is no serial port available, you can additionally use the USB adapter cable for Terxon MX (AZ5107) to connect the serial programming cable. The software required for programming is available for download free of charge from our website.