Pololu TReX - Manual (Page 24)

Select the COM port your TReX is connected to and enter the firmware update file’s path. Click the Program button
to initiate the firmware update. If all goes correctly, you will be prompted to confirm that you want to erase your
current firmware and you will then see a progress bar showing you the status of the upload. If no errors occur, you
will see a success message when the update is finished.
Option 2: using a terminal program
If you would rather use a terminal program, you will need one that is capable of transferring binary files, such as Tera
Term Pro. Connect to the serial port that your TReX is on at 115.2 kbsp with 8-bit characters, no parity, and one stop
bit. No flow control is necessary. If you have completed the 8 steps above (so that the green status LED is flashing
once per second), you are ready to upload the new firmware file. First, transmit the characters:
‘l’, ‘o’, ‘a’, ‘d’
As you type these lowercase letters, you should see the capital versions echoed back to you, followed by the
bootloader identifier: LOADTReXBL1.2:. If you make a mistake, you should receive a ‘?’ and should start typing
‘load’ again from the beginning.
Next, transmit the character ‘s’. This will erase the current firmware. Finally, transfer the firmware update file (.trx)
to the TReX as a binary file. If everything works correctly you should see a ‘*’ appear and the TReX’s red status
LED will flash five times as it starts up before staying solidly on.
Pololu TReX User's Guide © 2001–2013 Pololu Corporation
6. Updating the TReX's Firmware Page 24 of 24