Putting ROVL Devices into Hardware Bootloader Mode

1. "S" Package: Disassemble the device, and locate the BOOT button (see the figured below).

2. "P" Package: Locate the BOOT wire you added to your firmware programming setup (see the figure below).

3. "P" Package: Verify the boot wire is +5V with respect to the unit’s ground (black) wire (when the FTDI cable or BLUART is powered). If not, correct the problem.

4. "S" Package: Hold the BOOT button down while applying power in the next step.

5. "P" Package: Hold the unit in one hand. Using the other hand, hold the BOOT wire against the tiny gold dot at the base of the unit. You are trying to make an electrical connection. See the Figure below.

6. Using your third hand, plug in the FTDI cable or otherwise apply power to the unit. If you don’t have three hands, ask a colleague to assist. Once the power is applied, "S" Package: you can release the boot switch, "P" Package: you can take the BOOT wire off the gold dot (continuing to make sure it does not contact metal or other electronics).

Figure for Step 4. BOOT Button on the "S" Package PCB used for the Mk II Transmitter and for Mk III Transceiver and Transponder. You only need to find this button if the firmware is corrupted and you can't use the normal firmware loading method. This button should be visible immediately upon removing the end cap of the unit, i.e., the PCB does not need to be dismounted.

Figure for Step 4. BOOT Button on "S" Package Mk II Receiver PCB. You only need to find this button if the firmware is corrupted and you can't use the normal firmware loading method. Note this is on the bottom side when opening the unit, so you will need to remove the mounting screws to get at this button. The firmware loading procedure can be done with the unit disassembled.

Figure for Step 5: Forcing "P" Package Unit into Boot Mode.

Figure for Step 2: USB-to-serial adapter: an example cable

The 12" pigtail is only needed for ROVL "P" package units!