: Connecting auxiliary sensors to the main ECU.
Some CLS-3900 units come with a DB9 connector for RS-232. In that case, you will need a null-modem cable or a MAX232 level shifter. cls-3900 car uart
CLS-3900 TX → RPi RX (GPIO 15) CLS-3900 RX → RPi TX (GPIO 14) GND → GND VCC → 3.3V (if supported) : Connecting auxiliary sensors to the main ECU
Have you used the CLS-3900 for a unique project? Share your experiences and custom firmware builds in the comments below. Drive safely, and log wisely. cls-3900 car uart
Why do professionals seek out the CLS-3900 specifically? The tool is rarely used for generic OBDII scanning. Instead, it is a tool for "deep work."