The AlarmDecoder AD2PI also supports other embedded systems that can use TTL RS-232 such as the BeagleBone Black. It's a fairly simple process to wire everything up and configure the BeagleBone to communicate with your device.

What you need

• An AlarmDecoder AD2PI
  • NOTE: The AD2PI pictured is a development board with an extra long pin header. You'll need to solder the connection or go in through the bottom.
• A BeagleBone Black
• Wires & solder

Steps

1. Make sure your BeagleBone and AD2PI are disconnected from power and the panel, respectively.
2. Connect the pins. See the images on the sidebar if you need a visual reference.
   

   

   AD2PI
   

   

   BeagleBone Black

Conn	AD2PI Pin	BeagleBone Pin
GND	6	1
3.3V	1	3
RX	10	11
TX	8	13

3. Connect power to your BeagleBone and boot it up.
4. Enable UART (instructions based on those found here)
1. Create a file named enable-art5.dts containing the DTS script to enable UART5.
2. Compile the device tree overlay:
• dtc -O dtb -o enable-uart5-00A0.dtbo -b O -@ enable-uart5.dts
3. Copy the compiled file to /lib/firmware
• cp enable-uart5-00A0.dtbo /lib/firmware
4. Enable the overlay:
• echo enable-uart5 >/sys/devices/bone_capmgr.*/slots
5. Your device should now show up as /dev/ttyO4.
5. Test your device:
1. Open the serial port with screen:
• screen /dev/ttyO4 115200
2. Confirm communication with the device by rebooting it with =.
3. Exit screen by typing Ctrl+A+K.

DTS script

/*
 * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
/dts-v1/;
/plugin/;

/ {
    compatible = "ti,beaglebone", "ti,beaglebone-black";

    /* identification */
    part-number = "uart5";

    fragment@0 {
        target = <&am33xx_pinmux>;
        __overlay__ {
            pinctrl_uart5: pinctrl_uart5_pins {
                pinctrl-single,pins = <                                    
                        0x070 0x26  /* P9_11 = GPIO0_30 = GPMC_WAIT0 , MODE6 */
                        0x074 0x06  /* P9_13 = GPIO0_31 = GPMC_WPN, MODE6 */
                >;
            };
        };
    };

    fragment@1{
        target = <&uart5>;
        __overlay__ {
            status          = "okay";
        };
    };

    fragment@2 {
        target = <&ocp>;
        __overlay__ {
            test_helper: helper {
                compatible = "bone-pinmux-helper";
                pinctrl-names = "default";
                pinctrl-0 = <&pinctrl_uart5>;
                status = "okay";
            };
        };
    };
};