PLX Devices
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M-400/M-500 Plug and Play Technical Specifications


Without Data Logger Daughter Board With Data Logger Daughter Board


  1. High Efficiency Switching Regulators - Converts your vehicle's voltage into separate constant voltage sources to provide stable and reliable power for various components on the M-400/M-500. These high performance regulators, with 85%+ efficiency, greatly reduces heat buildup and eliminates the need for a cooling fan.

  2. Resettable Fuse - This new solid state device mimics the functionality of a fuse. Current over 3Amps will cause the resettable fuse to trip and protect your vehicle and the M-400/M-500 from damage. Disconnecting the power resets the device.

  3. Decoupling Capacitors - Guards the digital circuitry from jitter, power supply ripple and improves overall signal integrity for reliable digital signal processing.

  4. CPU - Custom designed advanced CPU performs all the digital signal processing for the M-400/M-500 wideband o2 controller.

  5. Analog / Digital Converter - Acquires air/fuel ratio information from the oxygen sensor 100,000 times per second (100KHz).

  6. 4 Digit LED Display - Continuously display the air / fuel ratio value 10 times per second (10Hz).

  7. 32MHz Crystal Oscillator - Generates 32 million pulses per second to provide an ultra fast clock input signal for the CPUs.

  8. Digital / Analog Converter - Assists in accurate and precise wideband oxygen sensor control 100,000 times per second (100KHz).

  9. High Performance Inductors and Capacitors - Aids the switching voltage regulators in filtering out unwanted noise and ripple for increased controller performance and accuracy.

  10. CPU - Custom designed advanced CPU performs all the digital signal processing for the M-400/M-500 data logging acquisition and translation.

  11. Tantalum Capacitors - High performance capacitors filter out unwanted, jitter, noise and improves overall analog data logging signal integrity.

  12. High Frequency Noise Filters - Filters out high frequency electrical noise induced from ignition coils, sensors and other engine components for more accurate data logging.

  13. Input Protection Circuitry - Protects data logging circuitry up to 25V input. Any input voltage between 5-25V will be capped at 5V and will not damage the input circuitry. This also provides very high impedance inputs for transparent integration.




  1. Receiver Antenna - High efficiency reduced height receiver antenna shown above. Kit comes with standard length antenna for maximum range and performance. Optional "Wired" conversion cable available.

  2. PLX Radio Receiver - Ultra sensitive receiver designed to pickup and detect signals from the M-400/M-500.

  3. USB Plug - Wireless RX Module is designed to plug directly into your PC's USB port. External power is not needed for the device to operate.

  4. PLX USB Driver Chip - Communicates between your PC and the radio receiver. Also performs enumeration for Windows Plug and Play setup and detection.

  5. Power LED - Lights up green whenWireless RX Module is properly powered on.

  6. Receive LED - Blinks RED when a signal is detected from the M-400/M-500.