SLLU173C October   2012  – September 2021 SN65176B , SN65HVD05 , SN65HVD06 , SN65HVD07 , SN65HVD08 , SN65HVD10 , SN65HVD11 , SN65HVD1176 , SN65HVD12 , SN65HVD1780 , SN65HVD1781 , SN65HVD1782 , SN65HVD1785 , SN65HVD1786 , SN65HVD1787 , SN65HVD1794 , SN65HVD20 , SN65HVD21 , SN65HVD22 , SN65HVD23 , SN65HVD24 , SN65HVD3082E , SN65HVD3085E , SN65HVD3088E , SN65HVD485E , SN65HVD72 , SN65HVD75 , SN65HVD78 , SN65HVD82 , SN65LBC176 , SN65LBC176A , SN65LBC182 , THVD1419 , THVD1429

 

  1. 1Trademarks
  2. 2Overview
  3. 3EVM Setup and Precautions
  4. 4Powering Up the EVM and Taking Measurements
    1. 4.1 Measurement Examples
  5. 5Revision History

4 Powering Up the EVM and Taking Measurements

The generally recommended procedure for taking measurements is listed:

  1. Install the required ground connections.
  2. Connect the oscilloscope with the respective probe points you want to measure.
  3. Adjust the power-supply to match the VCC requirements of the selected RS-485 device.
  4. Adjust the generator outputs for a maximum output signal level, based on the VCC requirements of your selected RS-485 device, or check the logic switching levels of the controller I/O.
  5. Connect the power supply conductor with pin 3 of TB1 and observe the blue LED (D1) turning on.
  6. Connect signal conductors from the controller or the generator with their corresponding EVM inputs at JMP2 to JMP4.
  7. Logic high at the receiver output, R, will turn on the red LED (D3), and logic high at the driver input, D, turns on the green LED (D2). If D is left open, an internal 100-kΩ pull-up resistor provides logic high instead. However, due to the small input current, D2 will remain off.