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About JB4 USB Logger - for BMS JB4 -

Application to log data from BMS JB4 tuning boxes

* This is not associated with the BMS company in any way.

There was no way to use a USB cable connected to a phone/tablet with the JB4, so I made this application.

This will let you connect an Android phone or table using a USB to Serial cable right into the JB4, rather than having to buy an expensive bluetooth module.

A 5v TTL serial cable must be used for the JB4 side - BMS sell them or you can buy or build a custom made one, then a suitable OTG cable for your Android device.

PL-2303HX (MUCH cheaper) or TTL-232R-5V-WE should work if you are making your own USB to serial cable.

What's New in the Latest Version 2.0

Last updated on Oct 6, 2020

Logging and export working.
Only has timing log for 4 cylinders.
Still unsure about the labelling of some values.

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Additional APP Information

Latest Version

Request JB4 USB Logger - for BMS JB4 - Update 2.0

Uploaded by

Alan Stifler

Requires Android

Android 8.0+

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JB4 USB Logger - for BMS JB4 - Screenshots

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