How to Use USB to TTL Device (FT232)

This diagram shows how to properly connect a USB to TTL adapter (FT232) to a motorcycle ECU for tuning or diagnostics using MotoFlasher.

Steps:

1. Power the ECU using a 12V battery:

- Connect the positive (+) terminal to the 12V input of the ECU (red wire).
- Connect the negative (-) terminal to the ground (black wire), and make sure it’s shared with the TTL device.

You can use quick wire cable connectors to connect multiple positive and negative inputs, you can follow our guides from the ecu pinout page

2. Add a switch between the 12V line going to the ECU to easily turn it ON/OFF during the flashing process.

3. Connect the TTL Device:

- Black wire (GND) to the TTL and battery ground, add a switch that connects to ECU
- Green wire (TX) and Yellow wire (RX) to the ECU’s respective TX and RX pins. (Follow the guide for correct pinout from our ecu pinouts page)
- Brown wire (5V) can be used if your ECU requires 5V signaling

⚠️ Important: The ground from the battery and the TTL device must be connected together for proper communication.

This simple setup ensures reliable communication between your TTL device and the ECU for correct flashing procedure.